Good Sam Club Open Roads Forum: Tech Issues: Brake Wire
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Busdriver

Shepherdsville Ky 40165

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Posted: 07/20/21 04:01pm Link  |  Quote  |  Print  |  Notify Moderator

Thinking about running new wire for my Trailer Brakes , just not sure what size wire I should use.? The wire the manufacturer used is very thin.


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Mel Stuplich

Wausau, WI

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Posted: 07/20/21 04:26pm Link  |  Quote  |  Print  |  Notify Moderator

14 gauge is typical.

theoldwizard1

SE MI

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Posted: 07/20/21 04:29pm Link  |  Quote  |  Print  |  Notify Moderator

Just a gut feel, but I would think 12AWG.

Also, spend the extra and buy marine pre-tinned wire. It will NOT corrode !

Bobbo

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Posted: 07/20/21 05:50pm Link  |  Quote  |  Print  |  Notify Moderator

The bigger the wire the less voltage drop you will have. Using 12g is fine. 10g is better. 8g is better still, and so on. Use the largest wire you can comfortably use. Second the suggestion to use only marine wire.

Personally, I wouldn't go smaller than 10g.


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Sjm9911

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Posted: 07/20/21 05:56pm Link  |  Quote  |  Print  |  Notify Moderator

I will be the on the oposote side. Etrailor recomended 10/2 wire. Way to big and cumbersome to attache to the way smaller wires in the electric brakes. If i had to do it over 16 guage would be enough. I think my original stuff was that big or smaller.


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enblethen

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Posted: 07/20/21 06:38pm Link  |  Quote  |  Print  |  Notify Moderator

I would recommend this wire.
Brake wire


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PastorCharlie

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Posted: 07/20/21 06:41pm Link  |  Quote  |  Print  |  Notify Moderator

No less than 12 AWG. The more copper strands in the wire the better.

Gdetrailer

PA

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Posted: 07/20/21 08:47pm Link  |  Quote  |  Print  |  Notify Moderator

Sjm9911 wrote:

I will be the on the oposote side. Etrailor recomended 10/2 wire. Way to big and cumbersome to attache to the way smaller wires in the electric brakes. If i had to do it over 16 guage would be enough. I think my original stuff was that big or smaller.


That would be OK if you don't mind having as much as 30% less breaking capacity available.

The smaller size of wire, the higher the resistance, that resistance eats up valuable voltage, less voltage equals less current running through the magnets, less current running though the magnets equals less strength of the magnets which means the brake shoes have less gripping power on the drum..

Moving to 10 ga wire from factory 14 ga wire can gain about 20% more braking power available.

As far as dealing with thicker wire, yeah, can be a pain, but once again, there are ways around that issue. You can use what is called extra flex wire, it uses very fine strands of wire which makes for a much easier to flex wire.

Myself, I used two pairs of 10 ga wire from front of trailer to the axles.. More brakes than I need and do not have to set my controller above 5.5 out of 10 on the output.

Sjm9911

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Posted: 07/20/21 09:03pm Link  |  Quote  |  Print  |  Notify Moderator

I get the principles and practices, i just figured the manafature has allready considered the drop into the specs. So its designed to work woth the guage it has and to upgrade it will not nessassarly equate better stopping.

ktmrfs

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Posted: 07/20/21 10:03pm Link  |  Quote  |  Print  |  Notify Moderator

10 or 12 is more than adequate. when taking into account the coil resistance of each brake magnet and typical runs, drop is acceptable. with the factory skimpy wiring on our and a prodigy, full brake on the prodigy wouldn't lock up the brakes on dry pavement. After going to 12g and soldering the connections, including bypassing the typical side to side wiring in the axle, 6 or 7 will lock up the brakes at 60mph on dry pavement.


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