Second battery

[Kv5137kv5137]

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Does that clearance look ok?


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[Kv5137kv5137]

It’s a spare battery I had after I returned a lease


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[5vortec7]

Looks like it may be close to rubbing the pad under the hood, especially after you add the post clamps. Put some cardboard on top of it and try shutting the hood nice and easy to see if it pushes into the cardboard.

 

[RichLo]

^yep, I did something similar on my plow truck, I just put some thick plastic on top of the positive terminal in case it bounces around. (mines just a snow plow truck for my own driveway though)

 

[Demon Mudder]

Going to revive this, how'd the battery turn out for ya?

 

[1998_K1500_Sub]

Here's a dual-battery wiring diagram from the 1998 service manual, FWIW (attached).

See pg. 3.

Pg. 1 is for the ZM9 upfitter option.

Of course the 2nd battery can always be wired "as desired". Some use a relay to isolate the battery when the ignition is off, and to connect the battery when the ignition is on (to charge it), akin to how some RV auxiliary batteries are wired.

 

[Demon Mudder]

Here's a dual-battery wiring diagram from the 1998 service manual, FWIW (attached).

See pg. 3.

Pg. 1 is for the ZM9 upfitter option.

Of course the 2nd battery can always be wired "as desired". Some use a relay to isolate the battery when the ignition is off, and connect the battery when the ignition is on (to charge it), akin to how some RV batteries are wired.

I'll have to pull it up later, my phone won't let me view more than the first page diagram. Though that's what I'd like to do, hook in a second battery to charge alongside the main one, but use it for some accessories, safely while the engine off.

 

[1998_K1500_Sub]

What I'd like to do, hook in a second battery to charge alongside the main one, but use it for some accessories, safely while the engine off.

That's how it's wired on my Suburban.

A heavy-duty (high-current capacity) relay was added (mounted on the driver's fenderwell in my case). The relay is energized by the IGN, and the relay's contacts are wired in-series with a lead running between an "accy" stud on the firewall fuse box and the 2nd battery's POS.

The 2nd battery's NEG is wired to vehicle ground; my preference would be to connect it to

- the other battery's NEG terminal, or

- the ground wire connection on the passenger's fender (which is already wired to the 1st battery's NEG terminal, on my truck anyway), or

- the engine block, anywhere

 

[Demon Mudder]

That's how it's wired on my Suburban.

A heavy-duty (high-current capacity) relay was added (mounted on the driver's fenderwell in my case). The relay is energized by the IGN, and the relay's contacts are wired in-series with a lead running between an "accy" stud on the firewall fuse box and the 2nd battery's POS.

The 2nd battery's NEG is wired to vehicle ground; my preference would be to connect it to

- the other battery's NEG terminal, or

- the ground wire connection on the passenger's fender (which is already wired to the 1st battery's NEG terminal, on my truck anyway), or

- the engine block, anywhere

Sounds like a plan for a set up, issue now is, finding a tray for it, needed to make a junkyard run anyway, so hopefully I'll get lucky.

 

[smdk2500]

Just a suggestion could always just wire it up the like the diesel trucks are. On my 95 the alt charge wire goes to the drivers side battery a positive cable connects the 2 positives and the grounds go to the block on each side of the engine. Doing it this way doesn't enable you to isolate a battery from the other but it is super simple.