Reverse lights - Dodge Cummins Diesel Forum
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post #1 of 8 (permalink) Old 02-07-2017, 05:48 PM Thread Starter
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Reverse lights

I recently installed LED flood lights to replace my reverse lights. I cut the passenger side reverse light out and hard wired the LEDs to the reverse lights wire then grounded both to the frame. The issue is when the brakes are applied the LEDs come on but not full power just dim.

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post #2 of 8 (permalink) Old 02-20-2017, 10:35 PM
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From what Iíve seen on youtube you might need a resistor. My LED reverse lights are staying on dim all the time. Even when I pull the fuse they are geting power from somewhere ? When the manual trans is put in reverse they work fine.
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post #3 of 8 (permalink) Old 03-07-2017, 10:20 PM
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You are getting power from some where. It could be the switch. I would put a relay on the truck and run off the battery.
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post #4 of 8 (permalink) Old 03-08-2017, 01:24 AM
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Quote:
Originally Posted by redneck733 View Post
You are getting power from some where. It could be the switch. I would put a relay on the truck and run off the battery.
I'd have to agree with this. If they are LED flood lights, wire them to the battery. Without looking at the wiring diagram, it's possible that the reverse lights come on by completing a ground. If you ran your own ground, then you would always have a complete circuit, hence drawing amperage.

Keep your reverse lights in tact, and wire up a switch that you can activate when you need it. Pointless for floods to come on in the daytime. Just has the potential to blind someone in a parking lot.

I have mine wired to a switch. Use em when I need them. Def don't want to be the guy tailgating me.

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post #5 of 8 (permalink) Old 03-08-2017, 12:57 PM
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I installed one of these on each light...http://www.autozone.com/electrical-a...rs/771931_0_0/
Solved my problem.

SLT, reg. cab., 3500HD, 6.7, manual trans., 4x4, dually with Tiger CX R.V. coach permanently mounted
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post #6 of 8 (permalink) Old 03-13-2017, 08:32 AM
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A relay wont stop the problem. A relay you would buy for something like that at Auto Zone etc... takes approx 1/10th of an amp, to trip. Youre already getting power from a bleed through somewhere, and that little amount of current would trip the relay and allow the issue to continue.

Case in point, when I installed my light bar on my bull bar, I wanted it to have its own switch in the cab. BUT, since I didnt want to have to reach for my dimmer switch to kick off my high beams, AND reach for a switch for the light bar at the same time (if I met an oncoming car out in the stix) I fed the switch for the light bar, off of my high beams.

So.... heavy wire from battery through inline fuse to relay, and out to light bar. Light wire from high beams, through switch in the cab, to relay. This way, I can run my high beams without running the light bar. When the light bar switch is on, turning on my high beams turns the light bar on.... dimming them turns it off.

BUT...... If I leave that switch for the light bar on..... when I open the door (truck off, key off, lights off) the light bar flashes. Why? Because a small pulse of current is sent through the lighting system, including the high beams.... when you open the door and the dome lights etc... come on. This pulse of current isnt enough to turn on any other lights or make them flash, but it WILL make my light bar flash quickly like a bolt of lightning lol.

So, I know first hand that if you have any small bleed through of current, it will still trip the relay, and you would still have the problem.

I just got my LED lights cut into my new bumper. When I hang the new bumper, I am wiring the lights off a switch panel I made, in the cab. I dont need those bright back up lights often, and dont want them coming on every time I am reverse..... blinding everyone in parking lots etc... at night

The resistors that sourdoughben listed would be a better thing to try, not a relay.

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Last edited by SilverFox66; 03-13-2017 at 08:34 AM.
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post #7 of 8 (permalink) Old 03-21-2017, 01:06 PM
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A switch on the ground lead will take care of the problem.
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post #8 of 8 (permalink) Old 03-21-2017, 02:36 PM
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Then you have to flip the switch any time you need reverse lights

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