Custom Battery Cables

Custom Battery Cables Home

Battery Cables for Cars, Trucks and Jeeps:

F150 & Bronco

1987-99 F250 & F350

1999-2003 F250 & F350

Jeep Wrangler

Jeep Cherokee and Grand Cherokee

Willys and Military Jeeps

1994 - 1998 Dodge Ram 2500/3500 5.9L Cummins

1998 - 2002 Dodge Ram 2500/3500 5.9L Cummins

2003 - 2007 Dodge Ram 2500/3500 5.9L Cummins

2007 - 2009 Dodge Ram 2500/3500 6.7L

GM Cables

Project Snow Leopard FJ dual battery set

Other Applications

Battery Cables for Other Applications:

2 gauge Golf Cart Cables

2/0 Cables for Solar Battery Banks

Braided Ground Cables

Booster (Jumper) Cables

Made-To-Order Custom Battery Cables:

Custom Orders

Accessories, parts and tools:

NOCO Genius Wicked Smart Chargers

Battery and Cable Accessories

Battery Cable Repair Kits

Buy Wire, Terminals, Lugs, Heat Shrink and Tools

Clearance and discount cables.

Rush Orders.

Technical Info and Other Useful Stuff:

Do You Need New Cables?

Battery Cable Tips and Tricks

Different types of Cable Ends

Different Wire Types

What size cable do you need?

Wire size, thickness, amperage

Battery Isolators

Customer Cars



How we assemble cables

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custom battery cables


After answering numerous questions about different battery isolator schemes, I decided it would be easier to just build a web page... Below you will find the basic design of 3 types of battery isolators with the pro's and con's of each. 

I got an email from someone scolding me that I was not telling the whole story and claiming diagrams were simplistic (overly simple).  That is all true.  The diagram below are intended as an overview and some details are missing from the diagrams. 

custom battery cables

The Diode Battery Isolator

diode type himbattery isolator

The diode type battery isolator uses semiconductor diodes to split the current from the alternator or generator and charge 2 or more batteries at the same time.  One battery is used to start the engine the other is used to run the accessories.  The load on the accessory battery does not drain the starting battery so it remains charged even when the accessory battery is run down. 

Pros: no user action needed to operate.

Cons: May requires some wiring changes -- you need to separate starter/ignition from accessory wiring.  This could be complex in a modern vehicle.  Some vehicles will need the VSense line connected to alternator.


custom battery cables

The Battery Switch

battery switchThe battery switch allows you to switch between 1 or more batteries and sometimes between a combination of batteries.  A common battery switch lets you choose battery 1, battery 2 or both.  Which ever battery you choose is connected directly to the engine, alternator and accessories.  The switch lets you drain one battery, then switch to another to start the engine.  You must then switch to "both" in order to charge both batteries or have a separate diode-type battery isolator.

Pros: No need to separate starter/ignition wiring from accessory wiring.

Cons: Requires user to manually switch between batteries.
         Heavy battery cables must be run to the switch  

  custom battery cables

Auxiliary battery solenoid

solenoid type battery isolatorThe  solenoid isolator uses a continuous duty solenoid to connect the auxiliary battery during certain times (like starting and charging) then  disconnects it when not in use.  The solenoid can be switched to be on all the time, off, or on with ignition depending on how the switch is wired.   


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Revised: 03/28/14.