freightliner jump starting question

All 4 batteries are connected in parallel?
4 positive battery posts connected to a common cable.
Same with the negative?
It shouldn't matter which cable or post you put the jumper cables on.

Good luck

 

Doesn’t matter how you look at it or connect it. It’ll charge them all and still start since it’s freezing let it sit for 5 10 minutes get a nice charge with your revs up. And then have him crank it.

Also if by some reason you have trouble. And you have two sets of cables you can run straight from your alternator to his batteries.

If all that fails.

Leave your truck running take out two of your batteries ( whichever one don’t have the ecm wire going to it) take yours out and put it on his truck and fire his up then just swap your batteries back. Trucks can run on alternator power only. If the ecm has power.

You won’t fail

Edit: I would do the last thing I said right off the bat if jumping it doesn’t work

 

A lot of Trucks have a positive jumping post under the hood. Usually mounted on the frame. Then clamp negative to frame. If both Trucks have them even better. No sparks near ( possibly ) bad batteries. Safe practice method, I believe, is hook up dead battery first, good battery second. Grounding to frame, to avoid sparks.

 

Since they’re all connected together, they’re all going to the starter. There’s 2 hot wires, to carry enough juice.Got to connect them somewhere. It doesn’t matter. I’ve thought through the same thing as you. When jumping, power is going to all batteries that are low, and to starter, when engaged. I Usually have to wait a bit, as much as 20 minutes. To get enough juice into batteries to help my car supply enough juice to crank the Truck. Even jumped my Dads Truck once with a motorcycle, took forever. But another Truck, along with thick gauge cables, will crank it right up.Because it has enough juice, I guess 1 dead battery and 1 good jump, would be quicker than 4 dead batteries and a jump, especially if cables on Truck are old, or one of the batteries is shorted out. Hooking to the battery running to the starter would be better, due to resistance in the bad battery. A lot of Company Trucks used to have 1 battery dedicated to the starter. So if Driver ran batteries down while parked, Truck would still start. I don’t know what all is involved, for the battery to charge, yet only be drawn down by the starter. I imagine a selinoid of some sort. But I like the idea. I’m not good with electrical at all, Lol. But I think you’re right, for the same reasons, jumping straight to the selinoid or starter works immediately. Current flows to the path of least resistance. The closer to starter, the better.

 

I have no idea. My Classic has 2 positives and 1 ground, running from batteries to starter, along with 1 small fusible link for ecm. I only have 3 ( total ) batteries, all parallel, if both hots are going to starter on yours, wouldn’t that basically make it the same as all 4 batteries wired parallel? I would think all 4 are supplying power to the starter. Never saw batteries wired like that. Maybe 2 are isolated, for starting only, when others get drawn down. I wish I knew more. Would like to add 2 myself, for a total of 5. Having 2 being protected automatically from total drainage, for starting only. A simple isolator switch used to be common, for disconnecting all or some of the batteries. Anything deeper than that, I’m lost. Shade tree mechanic at best, here.

 

Cascadia has 4 batteries and all of them wired parallel. 2 positive wires are coming out. One for starter and one for truck. 2 negative wires are coming out. one for start and one for frame rail. if one battery will have short Inside it will drain all batteries over night.