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I found the issue. There was a fusible link that the last owner had connected on the positive terminal bank (on the firewall) and was not attached to anything else. The loose end of it managed to be touching the negative terminal bank beneath. Once I removed this link, I was able to reconnect...

I can see that!!! It was HOT

It looks like I was able to disconnect the lead before it did too much damage. The fusible links on both main charging wires did their job though. Thanks for all of the help! I'm the guy who has no real issues working through mechanical issues but hates dealing with the electrical issues so this...

Looks like they are both just 8 ga wire with 12 ga fusible link wire on the end connected to the terminal ring. Should not be too hard to make myself. Thanks for all the help.

Thanks...I'll check there!

My biggest issue now is getting the main charging wires replaced. Does anyone know where I can look to purchase them?

Thanks! I checked all of that and no visible issues so far. Ill check voltage once I get everything reconnected

Thanks! Terminal cables appear to be fine. It is the main charging wires from the alternators that melted. They appear to be 10 or 12 gauge with what looks like a fusible link on the end where they connect to the resistor bank on the firewall (next to the glow plug relay).

Thanks! Great suggestion...learned it the hard way this time

Thanks for the reply! I'm new to the 24v system so I tried to reconnect exactly how it was connected with the old batteries when it was working properly. So should positive on battery 1 be connected to negative on battery 2 etc?

I just recently replaced both batteries in my M1009 with Interstate group 31's. When I reconnected the terminal cables, I connected positive first and then negative. When I was connecting the last negative, the lead started sparking and got red hot. Because it was a threaded post, the ring...