Light bar wiring to battery

[samm88]

Hello, I have a based Grenadier w/o high load auxiliary switch. I want to install a light bar but I do not know where to run the wiring from the roof to the battery. Does anyone what location where I could run the wiring? Ty

 

[TheDocAUS]

Ask @Telemark who has the same challenge (then let us know what you did):

T

Thread 'Aux Lightbar without the High-Load Panel'

Nov 18, 2025

I’m looking for someone to sanity-check my wiring plan.

My Quartermaster does NOT have the high-load auxiliary switch panel. I installed the Ineos cross-bar light bar (given to me), which needs a 25-amp circuit. My idea is to use Aux Switch 1 (rated for 10 amps) only to trigger a 30-amp relay, and then run a dedicated power feed to the relay with a 25-amp fuse for the actual light bar power. Does this wiring approach make sense? Not sure how I run the power to the rack yet, that I will figure out later. Appreciate any thoughts on this!

• Telemark
• aux aux lights lightbar lights panel wiring
• Replies: 6
• Forum: Grenadier Quartermaster Pickup

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[rob88]

There's a grommet behind the passenger side kick panel. Pull the plastic trim off in the footwell and you'll see it. Run your wires through there into the engine bay and over to the battery. It's the cleanest way.

 

[Telemark]

Hi Samm,

I had the same issue and wired my quartermaster this past week. I used the ext 1 switch (10 amps) to trigger a 50amp Fastronix relay under the hood. I have the Ineos lightbar that pulls 25amps so used a 50amp relay. The ext 1 wires are under the hood on the left had side. Once you find those wires extend them with heat shrink butt connectors and 12 gauge wire to the relay. You will need a fused connector between the buss bar post (power is from the post that you use to jump start it) and the relay. I ran the cable from the engine compartment along the frame/ I have a quartermaster, so it was easy to run the cable between the cab and the tub, up the loadbars to the roof. Let me know if you have other questions and good luck.