Adding switch to reverse lights
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Laughing Gas
Joined: Feb 2014
Posts: 1,041
Likes: 72
From: Springfield
Must be missing something but if I open up the reverse light circuit to install any switch in-line how will they work normally if the circuit isn’t complete? How woukd I go about paralleling in the circuit to mimic the wiring for a manual trans truck, I’d rather not have to take a lot apart just to run several new wires if I can just run my hot wire of the rocker switch and a ground if I used a relay
Logistics Pro
Joined: Oct 2006
Posts: 4,025
Likes: 890
From: East Central Ia
IInterrupt your factory reverse light wire, hook the cab side wire to pin 87a, hook the bulb side to 30. Lights will work as normal. Hook a fused power wire to pin 87. Hook pin 85 to ground. Hook 86 whatever type of switch you have as long as it has power, constant on or key switched. When the relay is not energized on pin 86 your factory reverse power just passes through the relay. When pin 86 is powered it will switch the power from your fused source back to the bulbs. I hope I explaned this right.
Fleet Owner
Joined: Apr 2008
Posts: 24,316
Likes: 5,127
From: 0,0,1
IInterrupt your factory reverse light wire, hook the cab side wire to pin 87a, hook the bulb side to 30. Lights will work as normal. Hook a fused power wire to pin 87. Hook pin 85 to ground. Hook 86 whatever type of switch you have as long as it has power, constant on or key switched. When the relay is not energized on pin 86 your factory reverse power just passes through the relay. When pin 86 is powered it will switch the power from your fused source back to the bulbs. I hope I explaned this right.
Tuned
Joined: Feb 2020
Posts: 476
Likes: 91
From: Owen Sound Ontario
Okay before you go ahead and do this I have another idea which I have done in the past and really, really liked. I have a set of reverse lights in my backrack for plowing snow. sometimes the snow is falling too heavily and the lights are more of a hindrance than useful. I wired in a 3 position switch. Up, Middle and Down. I then found the relay under the dash for the trailer reverse lights and cut the wire that feeds from it to the trailer plug. Into one side of my 3 position switch is constant power, the other side of it has the relay side of the reverse light wire and the wire in the middle of the switch runs back to the trailer plug side of the reverse light wire. This effectively lets me turn the lights On, Off or On in reverse only. it is very tidy and only needs the one switch and a few feet of wire, no fuses or relays.
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