Battery master disconnect?

Those are Sterling miles. That's like 800,000 on a Kenworth.

 

My ‘79 is the same. Best i can tell is they used a smaller cable back then. I’m going to re-wire mine this week & install a cut off switch. I’m going to switch it over to a 4 bank system like the newer trucks.

 

I took mine out a long time ago and have never regretted it. I don't see a need for it. When I park the truck at home for any amount of time, I hook up shore power to keep the batteries topped. When I'm on the road, what's the point? At the shop, they disconnect at the battery when they need to.

 

You don't have 36 volts. You still only have 12, but probably 2250-3000 cold cranking amps.