Lightbar wiring to EXT 1

[cdsvt]

Since Ext 1 is a 10 amp circuit, and the lightbar I am installing draws 6.4 amps, is it reasonable to think that I can wire direct to the positive side of my lightbar from the Ext 1 lead in the engine bay, then wire the negative lead to a suitable chassis ground and I'll be good to go? This seems a lot simpler than having relays in the mix. It makes logical sense to me, but I'm afraid I'm not thinking of something.

 

[TheDocAUS]

No reason why you cannot do that. Just enure the max draw AND the constant draw do not exceed 10 amps. That info should be in the specs for the lightbar.

A good rule of thumb is to run the circuit below 80% of capacity and 6.4 amps is below 80%. That way you have some overhead if there is a variation in the draw. The IG uses good quality fuses. Just make sure you have some spares.

Wire ends in the Grenadier and QM (covering standard and high power aux power panels)

Mar 23, 2025

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[cdsvt]

Thank you.

They only publish amp draw, not broken down into max and constant.

I have the 5 Watt/Osram 100w in the table below.

Also, I apologize it is 6.7 amp draw, not 6.4 amp draw.

 

[TheDocAUS]

6.7amps is still fine.

 

[cdsvt]

Thank you!

 

[cdsvt]

I got it wired up and it works.

I messed up and connected it to Ext 5, but I can fix that when the weather warms up.

Ext 1 and 5 are both in the same area, for me Ext 5 was closer to the firewall and Ext 1 was further forward and lower. The wire colors didn't seem to line up with the guide I was reading. Ext 1 (+) had a stripe, Ext 5 didn't.

If Ineos is reading this forum - a wish list item is minimally a longer pigtails on these auxiliary leads, and ideally terminate these with DT/DTP connectors. They're very difficult to work with with short pigtails and cramped quarters under the hood.

 

[cdsvt]

The results:

 

[Ovrland Bill]

The results:
View attachment 7918948View attachment 7918949View attachment 7918950

A light bar seems to fit well when mounted above the front bumper and ahead of the main radiator louvers. I am surprised that I have not seen more photos of such installations.

How did you install the light bar ‘feet’ onto the top of the bumper?

 

[cdsvt]

I drilled and tapped four holes, ran m6 bolts with washers through, and then put washers, lockwashers and stainless nuts underneath.

The bumper is steel, but not very thick, so I didn't trust bolts without nuts.

 

[cdsvt]

In case anyone is curious it is a 20" Black Oak single row lightbar with 5W Osram emitters and combination lenses.