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When I use the front battery negative post for ground I am getting 12.5 VDC at the GPs! I have always used the drivers side alternator negative post as ground because it is so convienent! Whew. Now I feel better...right? Or is something else amiss?

Not many connections. Twelve volt feed from diamond is direct to negative post of rear battery. Twenty four volt feed is via bus bar.

Thanks, Antennaclimber, this is the ideas I need. I checked the voltages of each battery while the GPs cycled. Front went from 12.7 VDC to 11.9; the rear went from 12.6 VDC to 11.9. I am getting the exact same reading from the top of the relay when closed as the bottom (as expected); but I am...

Can someone help me troubleshoot this? Stock M1009, 24 VDC setup, going through resistor bank. Multimeter ground to rear of driver side alternator, positive to top of glow plug relay - reading 24.5 VDC, everything off. Upon startup, engine cold, I read 7.5 VDC at this point while the glow...