New Era twin headlight relays - are they still good today?

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Originally Posted by TonyC

Is there any reason why you wouldn't pick up power from the starter motor, the alternator or the under bonnet fuse box, which has a couple of unused slots, and is supplied from the starter motor as far as I can tell.

Tony

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I pick up my 12v feed for driving lights from the alternator on my TD5, way shorter run than from the battery.

Quote:

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Originally Posted by TonyC

Is there any reason why you wouldn't pick up power from the starter motor, the alternator or the under bonnet fuse box, which has a couple of unused slots, and is supplied from the starter motor as far as I can tell.

Tony

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None of the vehicle manufacturers take power for the lights, or anything else, from that location, why I do not know.
During a run of one of VWs Golf’s models, they for a short time powered the lights from the alternator, as it meant a shorter wire run.
But half way through the run, for some reason, they went back to powering the lights from the cranking battery.
While I have no idea what the problem was, I prefer to play it safe and come off the cranking battery.

Would the voltage from the battery be more stable than from the alternator?

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Originally Posted by V8Ian

Would the voltage from the battery be more stable than from the alternator?

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Not by much, but there is a massive amount of voltage spikes at an alternator, where as the battery acts as a huge voltage suppressor and this may be why there may have been a problem when VW did it.

I wish I knew you sold 'em before I ordered one, Tim. Still, it arrived today. I suspect it will help breathe some life into the glow worms that inhabit the front of the OKA.