Adding a Battery 1990 Suburban

[Bright Idea]

I need to add a Battery to my 1990 Suburban. I need to know the best place to get a tray and any recommendations on isolator installation, wiring dos and dont's etc.

 

[Craig 85]

Here's a prior thread on it for an OEM set up.
https://www.gmsquarebody.com/threads/factory-dual-battery-wiring.15855/

About 15 years ago, I added one to my '77 K5 and used a set up similar to the one below. I used 8 ga. wire.
https://www.etrailer.com/comparison.aspx?pc=DW08771&pc2=DW08770
https://www.etrailer.com/Accessories-and-Parts/Deka/DW08769.html

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[Arkansas_V8]

I need to add a Battery to my 1990 Suburban. I need to know the best place to get a tray and any recommendations on isolator installation, wiring dos and dont's etc.

What are you gonna run requiring the extra battery? Just curious.

 

[RoryH19]

Assuming you have the passenger side battery tray now.
Look for a 6.2 diesel model as they have one on both sides.
At a minimum you can use the driver side battery tray.

 

[gmachinz]

I’m just adding an extra battery for the total amperage ability-no need in my case to run a seperator-I have stereo plans tho hee hee. I am using 1/0 gauge cable and 1” high heat looming, HD battery crimp connectors. I’m basically replicating the factory dual battery (TP2) RPO option.

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[gmachinz]

Couple more pics...

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[Arkansas_V8]

Couple more pics...

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Very clean man. Great job.

 

[73c20jim]

Cool a 6/12 battery. lol

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[Bright Idea]

I am going to run a boat trailer winch and a portable 12v air compressor for airing up tires.

 

[Arkansas_V8]

I am going to run a boat trailer winch and a portable 12v air compressor for airing up tires.

I run alot on a single. Winch, inverter, extra lights. All about alternator. But a dual would probably serve you well.