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Got new battery disconnect relay installed; problem solved. Thank you all for the guidance—

While I await the arrival of the new battery disconnect relay I took a look at the existing one. It looks almost as old as I am. Though I realised the new one is expecting a plug, not individual wires. Anyone know which plug?

I can be really slow. Are these just fancy ATC (breakers) fuses?

Water is the universal solvent—

99%? I have 91% isopropyl and denatured alcohols (along with a nice wine and good scotch) though I know I don't have 99% isopropyl—

Good to know. With my old eyes I need magnification to read the newspaper—

Added to my list—

Green—

With the BATTERY DISCONN and CHARGING SYSTEM warning lights on we are running through the ¿PDP? on the cab passenger side dash. I need to order some micro- and mini-relays, clean up the board and perhaps some electrical lube. Good news is after pulling cleaning and reseating a number of the...

So, while still awaiting the relay's arrival, @GeneralDisorder suggested, I am looking for a rattle likely from the cab latch alignment. While working on that I noticed the lights upon the alternator flashing in an alternating fashion: 24v, 12v, 24v,... I assume that is good. Still left is...

hmmm. I haven't checked at the alternator; dash gauge is higher, CTIS H and M are higher. Sounds like more good news =/ All good, it is all good. Better to know and address, than being clueless on the road once it comes up. Thank you, I appreciate all you share here on the forum—

Further exploration leads to finding the LBCD disconnected. Connecting adds the CHARGING SYSTEM dash warning to the BATTERY DISCONN dash warning. Shoot. Alternator still charging, starter still engaging. So far everything I use works, even the CTIS when the connections are jury-rigged. The...

Thank you. I'll start there—

Point me in the right direction please. I have spent too much time in the TM's looking for this and must just be too stupid or unable to channel the right mindset to find what I am seeking. 2003 M1078A1 has the red dash warning light BATTERY DISCONN lit, though everything (except the bricked...