Can 10 gauge Wire be Ran from Battery Isolation Solenoid to Positive Terminal on Trailer Battery

Updated 05/04/2020 | Published 09/05/2015

Products Featured in This Question

Starter Solenoid - SPST - 12 Volt - 100 Amp - Continuous Duty - Grounded

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$34.79

10 Gauge Wire - Blue Primary - Per Foot

(103)

$1.83

CTEK MULTI US 7002 12-Volt Universal Battery Charger w/ Pulse Maintenance and Backup Power

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$148.29

Question:

can i run #10 wire from voltage out to trailer direct to + post on the trailer batt.

asked by: Bill

Expert Reply:

Yes, you could run some 10 gauge wire, such as # 10-1-1 sold by the foot, from the battery isolation solenoid # PK5231201 to the positive terminal on the trailer battery. However, at best this will provide a maintenance charge only to the trailer battery, preventing it from losing any additional charge while that wire is connected and the vehicle is running.

The best solution is to have a maintenance charge on the trailer battery as described above but charge up the battery using an AC power charger such as # CTEK56353.

expert reply by: Michael H

Jason D.

5/1/2020

I was also wonder, I have a 2018 GMC Sierra Denali 2500 duramax and the power to the Trailer is hot. My questions is how do I install the tow ready battery isolation solenoid? I did it on my 2007 duramax but I just don’t know where to start on this 2018. Thank you

Chris R.

5/4/2020

The terminal functions for the Battery Isolation Solenoid # TR118665 will be the same as they were in your 2007 Duramax. As for which specific wires you'll tap to on the new Sierra, you will just need to use a circuit tester to find which wire gets power with the ignition. I wish I had a diagram for your Sierra but this isn't something that's easily accessible.