How to find live brake wire for trailer brake

How to find live brake wire for trailer brake

Postby randynavarro [OP] » May 29th 2020, 5:46pm

Hello all and thank you for having me.

I have done my due diligence and searched and searched but with no luck.

I've (almost) installed a new proportional brake controller in my 2005 Astro 2wd but I cannot figure how to find the live brake wire in to which I can tap.

I thought it would be simple but it's always my luck, the simple things are the things that usually botch me up!

Thanks.
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Re: How to find live brake wire for trailer brake

Postby Big_kid » May 30th 2020, 5:56pm

I have a degree in electronics and I never could find that wire when I added my brake controller. I was not about to hack up the harness, so I added an independent switch. There was an unused hole in the bracket, I went to a FLAPS and got a brake switch for a 77 Impala (any similar switch would work). No harness hacking required.
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Re: How to find live brake wire for trailer brake

Postby randynavarro [OP] » May 30th 2020, 6:42pm

Well...at least you make me feel better I"m not alone....

All the YouTube videos I've found showing brake installs gloss right past finding the right brake wire (unless they're installing something back at the tail light).

I'm sure somebody here got the answer!
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Re: How to find live brake wire for trailer brake

Postby Rod's Trucks » May 30th 2020, 7:20pm

I have no first hand experience, but I have seen it posed, that the 'Hot' wire to the trailer connector is sometimes not hooked up at the fuse box, but that it is taped up in the harness at the fuse box end. It will be a fairly large wire, compared to the others.
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Re: How to find live brake wire for trailer brake

Postby sixsix » May 30th 2020, 7:39pm

Do you think that a close up look at the wiring harness for Gen I vans might help?
edit: Gen I 85-94 / Gen II 95-05

We do realize your van is a 2005.
I have the optional 7 wire trailering feature / option...
- as well as the Full size FSM for the wiring diagrams.

'Scanning & Photos' is my middle name and I will use it if needed. haha.
I can find might know that wire and where to find it in the "Convenience Center" fuse board thingie.
Not an elec. guy - have plenty of time, just curious and might be able to help.
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Re: How to find live brake wire for trailer brake

Postby randynavarro [OP] » May 31st 2020, 7:15pm

Rod's Trucks wrote:I have no first hand experience, but I have seen it posed, that the 'Hot' wire to the trailer connector is sometimes not hooked up at the fuse box, but that it is taped up in the harness at the fuse box end. It will be a fairly large wire, compared to the others.
Rod J

Thanks, Rod but I'm actually looking for the small brake wire that activates the brake lights when the brake pedal is depressed.
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Re: How to find live brake wire for trailer brake

Postby randynavarro [OP] » May 31st 2020, 7:18pm

sixsix wrote:Do you think that a close up look at the wiring harness for Gen I vans might help?
edit: Gen I 85-94 / Gen II 95-05

We do realize your van is a 2005.
I have the optional 7 wire trailering feature / option...
- as well as the Full size FSM for the wiring diagrams.

'Scanning & Photos' is my middle name and I will use it if needed. haha.
I can find might know that wire and where to find it in the "Convenience Center" fuse board thingie.
Not an elec. guy - have plenty of time, just curious and might be able to help.


I've purchased a small hook probe that I'll be trying to today to see if I can find which wire is energized when the brake pedal is depressed.
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Van Make/Model: Chevrolet Astro


 
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