Does Wiring Up Trailer for Winch and Lights Require Relays
Updated 01/05/2026 | Published 09/22/2024
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Question:
Hi, I am wiring up a utility trailer from scratch and will have reverse/work lights on it as well as a winch with battery. I would like to have a 4 way switch that will control the reverse/work lights to be powered by 1. Truck reverse 2. 12v constant from truck 3. 12v battery on trailer This way I can maximize the use of the lights. Can I just use a switch or should I add relays in? What would that circuit look like with 3 potential power inputs? Thanks
asked by: Nick
Expert Reply:
You can use just a switch and not have to worry about adding relays. It would require you to use a heavier gauge wire for the battery like 10 gauge part # 10-1-1 which we sell by the foot.
Product Page this Question was Asked From
Bright Way Trailer Breakaway Kit with Switch and 0.5-Amp Charger
- Trailer Breakaway Kit
- Kit with Charger
- Side Load
- Top Load
- Single-Axle
- Tandem-Axle
- Tester Not Included
- Electric
- Battery Not Included
- 48 Inch Long
- Bright Way
more information >
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Jameson C.
1/5/2026
Hey, how did your wiring setup for the trailer lights and winch turn out using the heavier 10-gauge wire? Sharing what worked could help others planning a similar multi-power setup.