5-ton Battery Kill Switch??

[WildernessJeep]

My 1984 M936 has dead batteries every time I go to start it. These are NAPA military-style (the square ones) batteries less than a year old. I know I have a trickle drain somewhere in the truck, but damn if I can find it. I'd like to put a battery kill switch on it. Anyone have any pictures, part numbers, or guidance? Picture for attention.

 

[Mullaney]

My 1984 M936 has dead batteries every time I go to start it. These are NAPA military-style (the square ones) batteries less than a year old. I know I have a trickle drain somewhere in the truck, but damn if I can find it. I'd like to put a battery kill switch on it. Anyone have any pictures, part numbers, or guidance? Picture for attention.

View attachment 885919

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There are pretty good options for battery switching at Summit Racing.

 

[M35A2-AZ]

I put my cutoff switch at the end of the battery box on the drivers end. It is a Cole Hersec
Besure to put it on the Neg. side. The black box in my battery bix is for the Econ lights on the truck, All the battery cables are not hooked up to switch in this photo.
COLE HERSEE 2484-03-BX - 2484-03 - 2484

 

[charlesmann]

Im betting the search engine on any auto parts places, amazon or even google could give you part numbers and pics of master disconnect switches. Like mentioned already, wire in at the batt box. There are even lockable and removable key type. I got mine off amazon.

 

[kendelrio]

I went to NAPA and got a kill switch for a D9 bulldozer. I've had it almost 2 years and never had issue. Works like a charm.

 

[KN6KXR]

Pretty much any of the heavy duty ones will work. I have one with a little key. I mounted mine at the dead space at the end of the battery box, like above, along with a 70A 24/12 voltage converter and a fuse box for 12V stuff. Probably do a little inverter and remote on/off at some point. Lots of options plenty of space.

To find your drain disconnect the positive and put a DVM between positive and chassis. You'll read a low resistance (under a couple hundred kOhm). Then disconnect one thing at a time. When the resistance jumps higher you've got the culprit. At least one of them anyway. Then track it down. Schematics in the TM's are pretty decent. Simple. Takes time but simple.

 

[TechnoWeenie]

Here's what I used...

https://www.amazon.com/gp/product/B00NW4V66I

I flush mounted mine. Simple hole saw...