Select Your Vehicle
view cartView Cart

CALL NOW - 800-298-8924

Product Experts Available Now!

Free Shipping on Orders Over $99

Only 16 Hours 48 Minutes Remaining



How To Connect Auxillary Power On 2008 Chevrolet Silverado 2500 To Charge Trailer Breakaway Battery

Question:

need to know how to connect auxillary power to my truck to charge breakaway battery. auxillary power connection on 2008 chevy 2500 duramax

asked by: Jared V


Expert Reply:

If the 12 volt power pin (#4 pin at 1:00 position) on the 7-way connector on your 2008 Chevrolet Silverado 2500 is being used for a trailer battery you can use the center pin on the 7-way as an auxiliary power source. You can wire the center pole of your 7-way as an auxiliary power connection by running a 10 gauge wire, part # 10-1-1, to the positive post of the vehicles battery through a 40 amp circuit breaker, part # PK54540. If you wire your auxiliary power this way you will want to make sure the center pin on your trailers 7-way connector is also wired for the 12 volt power and the breakaway battery is connected to that center pin.

If the 12 volt power pin is not being used you will want to check and make sure you have 12 volt power to your 7-way connector at the rear of your 2008 Chevrolet Silverado 2500. You can use a circuit tester like the Quickee Tester, part # 3808, and test the number 4 pin on your 7-way, which is located at the 1:00 position, if you are looking at the front of the 7-way. See picture of 7-way to the right. This is the 12 volt power wire and when the 7-way connector from your trailer is plugged in it will provide the power needed to maintain a charge on your breakaway battery.

If you do not have power at the 7-way on your vehicle you will want to check a couple of connections under the hood to complete the trailer wiring package on your vehicle. The ring terminal for the 12-volt power lead for the 7-way trailer connector is located to the left of the power distribution box, and is taped to a wire harness under the power brake booster. You are looking for a red wire with a ring terminal on the end. This wire needs to be connected to the right side stud at the front of the power distribution box. You will also want to make sure there is a 40 amp fuse installed adjacent to the stud.

While you are under the hood you should probably go ahead and connect the brake controller power wire to the left side stud also. This wire is located at the right side of the power distribution box next to the fender and will also have a ring terminal on the end. This connection will also need a 30 amp fuse installed adjacent to the stud.

I am including a link to a FAQ page that will show where the wires are located and how to connect the wires. The information is at the end of the page where it says finalizing connections. Also, see the picture to the right that will show where the wires are under the hood.

expert reply by: Jeff D




Have a question for the experts? click here.


Products Referenced in This Question

10 Gauge Primary Wire - Blue - per Foot


10 Gauge Primary Wire - Blue -  per Foot

ratingratingratingratingrating
6 reviews

10-1-1

Retail: $0.94

Price:  $0.59

Product Summary:

Wiring
Accessories
10 Gauge
1 Wire

Product Specs:

Wire
Single Wire


more information        




Quickee Circuit Tester


Quickee Circuit Tester

ratingratingratingratingrating
3 reviews

3808

Retail: $34.42

Price:  $23.95

Product Summary:

Tools for Wiring
Testers
Circuit Tester


more information        




Twist-in, 7-Pole, RV-Style Trailer Connector for Chevy and GMC Vehicles - Vehicle End


Twist-in, 7-Pole, RV-Style Trailer Connector for Chevy and GMC Vehicles - Vehicle End

ratingratingratingratingrating
319 reviews

PK11916

Retail: $20.35

Price:  $14.99

Product Summary:

Trailer Hitch Wiring
No Converter
Custom Fit

Product Specs:

7 Blade


more information        




Pollak Circuit Breaker - Cycling/Automatic Reset - 40 Amp - Straight Mount Bracket


Pollak Circuit Breaker - Cycling/Automatic Reset - 40 Amp - Straight Mount Bracket

ratingratingratingratingrating
12 reviews

PK54540

Retail: $4.12

Price:  $3.99

Product Summary:

Wiring
Accessories
40 Amp

Product Specs:

Circuit Breaker


more information        





Product Page this Question was Asked From

Pollak Metal 7-Pole, RV-Style Trailer Socket - Vehicle End


Pollak Metal 7-Pole, RV-Style Trailer Socket - Vehicle End

ratingratingratingratingrating
70 reviews

PK12703

Retail: $11.88

Price:  $8.99

Product Summary:

Trailer Connectors
Vehicle End Connector

Product Specs:

Plug Only
7 Blade


more information        







More Answers about Wiring





Recently Viewed Products







Stay Connected


Subscribe to email newsletter

Email  

privacy - we don't send unsolicited email





Free Shipping on Orders Over $99

Only 16 Hours 48 Minutes Remaining


etrailer.com reviewsetrailer.com reviews

All images, layout and content copyright etrailer.com