Wiper motor
The wiper fuse blew on my Toyota Camry wagon when I activated the rear
wiper. I've taken the motor off and looked inside - no obvious problems. I'm wondering what electrical testing I can do with an ohmmeter. The complication is the relay unit, which has six connections. I'm not sure how it operates. |
Wiper motor
On Mon, 04 Jun 2012 13:20:07 +1200, Gib Bogle wrote:
The wiper fuse blew on my Toyota Camry wagon when I activated the rear wiper. I've taken the motor off and looked inside - no obvious problems. I'm wondering what electrical testing I can do with an ohmmeter. The complication is the relay unit, which has six connections. I'm not sure how it operates. How many connections to the motor unit? See if you can find the electrical diagrams on the 'net. Does the rear wiper doe "clever" things like come on automagically when you go into reverse and the main wipers are on? That could explain the number of wires to the relay box, though I'd expect that sort of thing to be done by a BCU these days. -- Cheers Dave. |
Wiper motor
In article ,
Gib Bogle wrote: The wiper fuse blew on my Toyota Camry wagon when I activated the rear wiper. I've taken the motor off and looked inside - no obvious problems. I'm wondering what electrical testing I can do with an ohmmeter. The complication is the relay unit, which has six connections. I'm not sure how it operates. Most rear wipers have an intermittent setting. Maybe also a timed cycle when using the washer, if it has one. So the 'relay' unit would have connections to the switch as well as the motor. The timer unit on my SD1 which has both these functions has 6 connections. But what you need is a circuit diagram for your model. You could then test the motor directly from the battery to ascertain whether it's that or the timer causing the problem. Was there any smell of burning when you looked at the motor? -- *Don't use no double negatives * Dave Plowman London SW To e-mail, change noise into sound. |
Wiper motor
On Jun 4, 2:20*am, Gib Bogle
wrote: The wiper fuse blew on my Toyota Camry wagon when I activated the rear wiper. *I've taken the motor off and looked inside - no obvious problems. *I'm wondering what electrical testing I can do with an ohmmeter. *The complication is the relay unit, which has six connections. *I'm not sure how it operates. On mine the rear wiper was so tight to turn because of corrosion between alloy housing and steel shaft going to wiper arm, stripped it completely and cleaned up and greased, goes much quicker now than it ever did. Al |
Wiper motor
On 4/06/2012 10:25 p.m., Dave Plowman (News) wrote:
In , Gib wrote: The wiper fuse blew on my Toyota Camry wagon when I activated the rear wiper. I've taken the motor off and looked inside - no obvious problems. I'm wondering what electrical testing I can do with an ohmmeter. The complication is the relay unit, which has six connections. I'm not sure how it operates. Most rear wipers have an intermittent setting. Maybe also a timed cycle when using the washer, if it has one. So the 'relay' unit would have connections to the switch as well as the motor. The timer unit on my SD1 which has both these functions has 6 connections. But what you need is a circuit diagram for your model. You could then test the motor directly from the battery to ascertain whether it's that or the timer causing the problem. Was there any smell of burning when you looked at the motor? I have a kind of generic circuit diagram, which doesn't convey a great deal to me. I think you're right about the timer. I tested the motor directly on the battery. Initially there were big sparks (the fuse-blowing kind), then it went open circuit. Not a good sign. I think I may need a new wiper motor. While testing things I noticed my battery voltage was very high (I'd just been running the engine). With the engine running the charging voltage is about 19v. A new, probably more serious, problem. It's a bit of a coincidence, so I'm wondering if they are linked. Could the high battery voltage have caused the motor to fail? I'm familiar with low or no voltage from the alternator, but I don't know what can cause a high voltage. |
Wiper motor
On 04/06/2012 22:03, Gib Bogle wrote:
While testing things I noticed my battery voltage was very high (I'd just been running the engine). With the engine running the charging voltage is about 19v. A new, probably more serious, problem. It's a bit of a coincidence, so I'm wondering if they are linked. Could the high battery voltage have caused the motor to fail? I'm familiar with low or no voltage from the alternator, but I don't know what can cause a high voltage. Buggered regulator innit? Which translates as new alternator time. If you've got 19v in your car, time to sort it and fast |
Wiper motor
On 5/06/2012 9:07 a.m., Clive George wrote:
On 04/06/2012 22:03, Gib Bogle wrote: While testing things I noticed my battery voltage was very high (I'd just been running the engine). With the engine running the charging voltage is about 19v. A new, probably more serious, problem. It's a bit of a coincidence, so I'm wondering if they are linked. Could the high battery voltage have caused the motor to fail? I'm familiar with low or no voltage from the alternator, but I don't know what can cause a high voltage. Buggered regulator innit? Which translates as new alternator time. If you've got 19v in your car, time to sort it and fast I am not starting the engine again until it's fixed. I hope it hasn't caused other damage already. |
Wiper motor
"Gib Bogle" wrote in message ... On 5/06/2012 9:07 a.m., Clive George wrote: On 04/06/2012 22:03, Gib Bogle wrote: While testing things I noticed my battery voltage was very high (I'd just been running the engine). With the engine running the charging voltage is about 19v. A new, probably more serious, problem. It's a bit of a coincidence, so I'm wondering if they are linked. Could the high battery voltage have caused the motor to fail? I'm familiar with low or no voltage from the alternator, but I don't know what can cause a high voltage. Buggered regulator innit? Which translates as new alternator time. If you've got 19v in your car, time to sort it and fast I am not starting the engine again until it's fixed. I hope it hasn't caused other damage already. You also have to watch these "tyre" places. I forget the details (it's been quite a while) but I had a voltage problem. They 'bunged' on 12V and zilch, so they 'bunged on' 24V (before I could stop them). Fortunately still zilch else I may have had every piece of equipment in the camper shagged. I can't remember what the problem was. I think I lost 1 x 12v bulb. Bloody kids who don't care a ****. |
Wiper motor
In article ,
Gib Bogle wrote: While testing things I noticed my battery voltage was very high (I'd just been running the engine). With the engine running the charging voltage is about 19v. A new, probably more serious, problem. It's a bit of a coincidence, so I'm wondering if they are linked. Could the high battery voltage have caused the motor to fail? I'm familiar with low or no voltage from the alternator, but I don't know what can cause a high voltage. Assuming your DVM hasn't failed - it is reading some 12.5v from the battery with the engine stopped? - the alternator regulator has failed. This is usually internal to the alternator but can be replaced for about £30 if you can be bothered finding one. Unless the rear wiper was in use for a long period, it's unlikely this high voltage will have caused it to fail. -- *Don't byte off more than you can view * Dave Plowman London SW To e-mail, change noise into sound. |
Wiper motor
On 5/06/2012 9:52 p.m., Dave Plowman (News) wrote:
In , Gib wrote: While testing things I noticed my battery voltage was very high (I'd just been running the engine). With the engine running the charging voltage is about 19v. A new, probably more serious, problem. It's a bit of a coincidence, so I'm wondering if they are linked. Could the high battery voltage have caused the motor to fail? I'm familiar with low or no voltage from the alternator, but I don't know what can cause a high voltage. Assuming your DVM hasn't failed - it is reading some 12.5v from the battery with the engine stopped? - the alternator regulator has failed. This is usually internal to the alternator but can be replaced for about £30 if you can be bothered finding one. Unless the rear wiper was in use for a long period, it's unlikely this high voltage will have caused it to fail. There are a couple of things going on here that I don't understand. After sitting overnight the battery still reads 18v, engine not started. This shows on three different scales of the DVM. Not believing it, I checked with my old analog meter - same thing. How can a 12v battery hold 18v of charge? |
Wiper motor
In article ,
Gib Bogle wrote: There are a couple of things going on here that I don't understand. After sitting overnight the battery still reads 18v, engine not started. This shows on three different scales of the DVM. Not believing it, I checked with my old analog meter - same thing. How can a 12v battery hold 18v of charge? Never seen any battery that reads that much over its nominal voltage. Try disconnecting it and see what it reads. And switch on the headlights etc without the engine running and see what the reading is. -- *All men are idiots, and I married their King. Dave Plowman London SW To e-mail, change noise into sound. |
Wiper motor
On Wed, 06 Jun 2012 09:43:48 +1200, Gib Bogle
wrote: How can a 12v battery hold 18v of charge? Because it's grossly over-charged, plus there's a surface charge on top of that. Normally, the max you'd see going into it would be 14.8V (which is at the top of the charging range for calcium batteries).You could try bringing it down with a load, like an old headlamp, but don't even switch the ignition on until it's come down by at least 3 volts. |
Wiper motor
Gib Bogle wrote:
On 5/06/2012 9:52 p.m., Dave Plowman (News) wrote: In , Gib wrote: While testing things I noticed my battery voltage was very high (I'd just been running the engine). With the engine running the charging voltage is about 19v. A new, probably more serious, problem. It's a bit of a coincidence, so I'm wondering if they are linked. Could the high battery voltage have caused the motor to fail? I'm familiar with low or no voltage from the alternator, but I don't know what can cause a high voltage. Assuming your DVM hasn't failed - it is reading some 12.5v from the battery with the engine stopped? - the alternator regulator has failed. This is usually internal to the alternator but can be replaced for about £30 if you can be bothered finding one. Unless the rear wiper was in use for a long period, it's unlikely this high voltage will have caused it to fail. There are a couple of things going on here that I don't understand. After sitting overnight the battery still reads 18v, engine not started. This shows on three different scales of the DVM. Not believing it, I checked with my old analog meter - same thing. How can a 12v battery hold 18v of charge? are there not some strange new batteries that do in fact take higher charge? it might also be pure 'surface charge'. If the battery type has that effect.. -- To people who know nothing, anything is possible. To people who know too much, it is a sad fact that they know how little is really possible - and how hard it is to achieve it. |
Wiper motor
In message , Gib Bogle
writes On 5/06/2012 9:52 p.m., Dave Plowman (News) wrote: In , Gib wrote: While testing things I noticed my battery voltage was very high (I'd just been running the engine). With the engine running the charging voltage is about 19v. A new, probably more serious, problem. It's a bit of a coincidence, so I'm wondering if they are linked. Could the high battery voltage have caused the motor to fail? I'm familiar with low or no voltage from the alternator, but I don't know what can cause a high voltage. Assuming your DVM hasn't failed - it is reading some 12.5v from the battery with the engine stopped? - the alternator regulator has failed. This is usually internal to the alternator but can be replaced for about £30 if you can be bothered finding one. Unless the rear wiper was in use for a long period, it's unlikely this high voltage will have caused it to fail. There are a couple of things going on here that I don't understand. After sitting overnight the battery still reads 18v, engine not started. This shows on three different scales of the DVM. Not believing it, I checked with my old analog meter - same thing. How can a 12v battery hold 18v of charge? When it's been seriously overcharged. Normally it is charged at 13.8v and when the engine is switched off it will decrease down to 12v. To stay at 18v overnight is a bit unusual though IMO. -- hugh |
Wiper motor
On 5/06/2012 9:52 p.m., Dave Plowman (News) wrote:
In , Gib wrote: While testing things I noticed my battery voltage was very high (I'd just been running the engine). With the engine running the charging voltage is about 19v. A new, probably more serious, problem. It's a bit of a coincidence, so I'm wondering if they are linked. Could the high battery voltage have caused the motor to fail? I'm familiar with low or no voltage from the alternator, but I don't know what can cause a high voltage. Assuming your DVM hasn't failed - it is reading some 12.5v from the battery with the engine stopped? - the alternator regulator has failed. This is usually internal to the alternator but can be replaced for about £30 if you can be bothered finding one. Unless the rear wiper was in use for a long period, it's unlikely this high voltage will have caused it to fail. More interesting battery behaviour. After another day I checked the voltage - still at 17.8v. It doesn't seem a good idea to leave it at this level, so I turned the headlights on. The voltage dropped steadily to about 12.8, then rose again to 13.7, then slowly fell again. After about 10 minutes it was down to 10.3. I turned the lights off, and it came back up to about 14.5v. I've now put the interior lights on, with the aim of slowly pulling the voltage down to about 13 v. This was a fairly young battery, but I guess it may be buggered by now. When I have some spare time I'll probably pull the alternator and have a look at the regulator - I usually can't resist getting involved in time-wasters like this. |
Wiper motor
In article ,
Gib Bogle wrote: More interesting battery behaviour. After another day I checked the voltage - still at 17.8v. It doesn't seem a good idea to leave it at this level, so I turned the headlights on. The voltage dropped steadily to about 12.8, then rose again to 13.7, then slowly fell again. After about 10 minutes it was down to 10.3. I turned the lights off, and it came back up to about 14.5v. I've now put the interior lights on, with the aim of slowly pulling the voltage down to about 13 v. This was a fairly young battery, but I guess it may be buggered by now. When I have some spare time I'll probably pull the alternator and have a look at the regulator - I usually can't resist getting involved in time-wasters like this. It sounds like the battery is knackered. It should run the headlights (2) for at least a couple of hours without going much below 12 volts. If you decide to have a go at fixing the alternator, check you can buy a new reg for it. Find out the make and model (should be on the body somewhere) and if a common type Ebay should have them. -- *Why isn't there a special name for the back of your knee? Dave Plowman London SW To e-mail, change noise into sound. |
Wiper motor
Dave Plowman (News) wrote:
*Why isn't there a special name for the back of your knee What's wrong with popliteal fossa? |
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