Thread: Trailer Relay
View Single Post
  #18   Report Post  
Posted to uk.d-i-y
bert[_7_] bert[_7_] is offline
external usenet poster
Posts: 3,556
Default Trailer Relay

In article , "Dave Plowman (News)"
In article ,
Chris Holmes wrote:

Back in the dark ages I had a Rover 214 with a tow bar. But it didn€˜t
have an indicator to show when you had a trailer attached.

It was possible to buy a replacement indicator relay which had an extra
output to light a bulb on the dash when it detected that there was an
extra bulb in parallel with the indicators.

How would this have worked? Would all of the indicator current have been
sent through the coil that activated the switch for the extra contact,
and only when the extra bulb was connected would the current be
sufficient to throw the switch?

Or something else?

You need an indicator light to tell you you have a trailer attached?


Last time I looked, which was some time ago you were required to have an
indication that your trailer indicators were working. Originally that
was visible and still is on my Defender but then switched to audible, to
save the manufacturers putting in a cable and dash light which in most
cars was never used. Don't know what it is now but on my 2015 T5
Transporter it is still audible.