T
Tony Miklos
- Jan 1, 1970
- 0
My van, like many newer vehicles, don't like extra brake and turn signal
lights for a trailer simply tapped into the existing wires.
I had a special unit hooked up which made things work, but it burnt up
last week. I could wire in a new brake/turn light unit, but with that
unit, between it's internal resistance and the overloading the little
wires made to power only 1 or 2 bulbs, there was quite a voltage drop
and the trailer lights were often dimmer than I'd like. (The voltage
drop was over 2 volts in certain situations.)
I thought this would be easy with some relays, but I ran into problems.
First to power the trailer, I ran a fused hot wire from the battery
junction box to the rear of the tow vehicle (van) and I have a good
ground off the van.
Keep in mind that the van has separate lights for brakes and turn
signals and the trailer uses the same lights for the brakes and the turn
signals.
I first wired in the turn signal lights tapping a relay into the vans
turn signals, they work great! Nice and bright! Then for the brake
lights I wired another relay with 1 diode going to each brake (and turn
signal) lights. I used the diodes to isolate the two separate turn signals.
Now the brake lights work great and bright!
But I forgot about 1 thing. When the brake lights are on, I need to be
able to make the trailers turn signal/brake light flash, which they
don't since the brake relay in on.
I believe I can do this using the normally closed terminals somewhere,
but my thinker isn't thinking as well as it used to.
Any help appreciated! And remember the tow vehicle has separate turn
and brake lights, and the trailer uses the same lights for the brakes
and towing. I think when it's done properly, I won't need the diodes
either, but hey, I'm asking for help so I'll shut up!
Thanks,
Tony
lights for a trailer simply tapped into the existing wires.
I had a special unit hooked up which made things work, but it burnt up
last week. I could wire in a new brake/turn light unit, but with that
unit, between it's internal resistance and the overloading the little
wires made to power only 1 or 2 bulbs, there was quite a voltage drop
and the trailer lights were often dimmer than I'd like. (The voltage
drop was over 2 volts in certain situations.)
I thought this would be easy with some relays, but I ran into problems.
First to power the trailer, I ran a fused hot wire from the battery
junction box to the rear of the tow vehicle (van) and I have a good
ground off the van.
Keep in mind that the van has separate lights for brakes and turn
signals and the trailer uses the same lights for the brakes and the turn
signals.
I first wired in the turn signal lights tapping a relay into the vans
turn signals, they work great! Nice and bright! Then for the brake
lights I wired another relay with 1 diode going to each brake (and turn
signal) lights. I used the diodes to isolate the two separate turn signals.
Now the brake lights work great and bright!
But I forgot about 1 thing. When the brake lights are on, I need to be
able to make the trailers turn signal/brake light flash, which they
don't since the brake relay in on.
I believe I can do this using the normally closed terminals somewhere,
but my thinker isn't thinking as well as it used to.
Any help appreciated! And remember the tow vehicle has separate turn
and brake lights, and the trailer uses the same lights for the brakes
and towing. I think when it's done properly, I won't need the diodes
either, but hey, I'm asking for help so I'll shut up!
Thanks,
Tony