Another tow wiring conundrum
I’ve had a couple posts in the last week, as I solve one electrical mystery, another pops up. Now, when testing my towed vehicle lights, I found a myriad of things that didn’t make sense (e.g. left s...
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Figured a pic might help. I’m at the back bumper of the RV (no toad), have taken apart the tow plug and taped the wires to a piece of wood. With running light switch on, the pic shows current going from the running light wire to ground wire – Expected. However when I touch the running light wire and either of the turn signal wires, I also show current flowing (indicator light on) – Not Expected.
The kicker is if I pull both (left and right) coach turn signal light bulbs (combo dual filament 1157 running & signal light bulbs), then current only flows between ground and running light wires – i.e. fixes the problem (but I would have no back turn signal bulbs)
I’ve put in new bulbs. Also reworked the white ground wires coming out the coach bulb housing creating it’s own ground, right at the housing (just to bypass the ground wire that I can’t see inside the coach walls.).
Still scratching my head.
The kicker is if I pull both (left and right) coach turn signal light bulbs (combo dual filament 1157 running & signal light bulbs), then current only flows between ground and running light wires – i.e. fixes the problem (but I would have no back turn signal bulbs)
I’ve put in new bulbs. Also reworked the white ground wires coming out the coach bulb housing creating it’s own ground, right at the housing (just to bypass the ground wire that I can’t see inside the coach walls.).
Still scratching my head.
