So what is this supposed to do? If its just so direction and hazard
indicators on the trailer work, normally these seem to be part of the
standard connection and run in parallel with the cars ones just like all the
other lights do. However if its an indication only that a trailer is hooked
up that would be easy to achieve with a link in the plug when its attached.
Some car stuff seems to be unreasonably complicated for what its supposed to
do..
Brian

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"Chris Holmes" wrote in message
...


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?


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Chris