Why does my truck have a spot for a second battery?

The first time you get a big truck and take a look under the hood you might just do a double take when you see two batteries instead of one. The two batteries are for higher cranking amps, which are needed for the high resistance load that a diesel engine requires during starting.

Does a dual battery system need a fuse?

You need a fuse at each end, As close as possible to the possitive terminal of each battery, Make sure your Circuit Breaker or Fuse is lower AMP rating then your Cable. Some do it without but you need to make sure that the cable is well insulated and protected otherwise your asking for trouble.

Do you need a fuse for an Anderson plug?

The correct Anderson plug cable size depends on what you are powering. This core diameter is compatible with a 50A plug and a standard caravan fridge. You will also need to choose either an inline fuse or reset breaker switch.

How to add a secondary battery to a Silverado?

When we drilled down into the BOM for adding a secondary battery we noticed that there is another battery tray listed #22989633. Has anyone else had to swap-out the tray that came with the truck in order to add the secondary battery so it could be secured? This how it looks now… I’ve gone through this entire process.

How to install a dual battery in a Chevy?

2) Add an extra ground cable from the aux battery to the frame, and one from the frame to the engine. For these 3 cables you can just buy a replacement universal battery cable with an eye on one end.

Where is the secondary auxiliary relay on a Chevy Silverado?

Step 1. Start by installing the battery isolator. Battery Isolator (GM P/N 12135194). GM calls this a “secondary auxiliary relay”. It goes on the firewall, up and left from the brake booster. How you mount it is up to you.

Where is the battery tray on a Chevy?

The battery tray is a easy to add, you just use the factory aux battery tray from GM and it will bolt into the stock location just like GM intented.. The tray is mounted on the pass side inner fender between the coolant tank and the firewall.

2) Add an extra ground cable from the aux battery to the frame, and one from the frame to the engine. For these 3 cables you can just buy a replacement universal battery cable with an eye on one end.

How do you hook up a second battery in a Silverado?

You need to run power from the fuse holder (bus bar side) to the top post of the isolator and then run power from the bottom post of the isolator to the second battery. The battery is then grounded to the driver side head via a M10x1.5 bolt. I also ran a ground from the second battery to the frame.

What kind of battery does a 2003 Silverado have?

I have a 2003 Silverado k1500 z71. The PRNDL indicator or the drivers information display does not illuminate. All gauges and other lights are … read more Chevy silverado 2002 replaced fuel pump, alternator, and battery. We have a 2003 Chevy Trailblazer with 104K miles.