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I make them. 12v/24v, alligator clips or slave plug. I've got a couple in KS but I won't be there for months. It charges through the slave port at 4 amps and then drops to a trickle as the batteries become charged.

But there's no reason not to use all four even on low amperage slave starts. It'll only draw the amps it needs. (Or am I missing something?)

I do the same with my wrecker. I don't use it enough to justify buying batteries for it, so when I need it I just slave it from one of the other trucks (and leave the cable connected)

I speculate that this idea came from the fact that the voltage regulator on some of the trucks will malf and fry the alternator unless there are good batteries in the loop. They applied this to all military diesel engines. (And I wasn't sure either way until Dewie's post)

I have them and sell them. I've got about a dozen left, at which point I've got no way to get more short of exorbitant prices. I also make slave cables. I've got the hydraulic crimper and heat shrink to do it right. I make them with 1/0 and 2/0 copper cable. The problem is they're in KS and...