On 9/25/2014 10:39 AM, amdx wrote:


I'm having very intermittent lack of starter rotation on a Toyota
T-100. Over the last 14 years I have replaced the contacts in the
solenoid and more recently (1 to 2 years) replaced the starter.
For trouble shooting I have a meter with one lead connected to the
bolt on the solenoid and the other to the frame. (solenoid is built in the starter)

The plan is; if I can get it to malfunction while trying to start it
and the voltage on the solenoid is 12.7v vs 10.7 then I know the
solenoid contacts didn't connect (if they clicked) or the starter is
open (less likely).
If the solenoid clicks and the voltage drops to a low value then I
probably have a bad connection in the wiring.

So far I have engaged the starter 25 times without malfunction.
Letting things cool, then I'll try again, if I hit 100 my work is done
for this go round!

Mikek



Ok, after about ten more times switching the key to start, the
starter did NOT engage. and the voltage stayed at 11.9v VS 10.7v
when the starter engaged.

So by my logic I suspect the contacts in the solenoid.

Anyone have other thoughts and a way to differentiate.
Oh, I like that going for a differential diagnoses!

Mikek

PS. I lament selling my Simpson 260, I had to grab a panel meter and
adjust it from a 75 volt meter to a 15 volt meter. Digital meters are
not real helpful for this type of testing.