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It can be easily converted to 12 volts. http://www.steelsoldiers.com/showthread.php?95803-M1009-Rear-power-24v-to-12v-modification&highlight=

Start checking and cleaning all of the ground connections on the alternator and the battery ground wire. See if the voltage comes up after cleaning.

Keep checking each part of the system. Work your way back to the batteries. Make sure you have a good ground connection on your voltmeter. Try using the front battery Negative terminal and measure your voltages again. Eventually you will locate where it drops out.

Sounds like you have a battery failing under load or a connection failing under load.What is the battery voltage of each battery when you turn the GP's on?

I will be there with CUCV GP cards.

Not at this time.

30 amp cont, 50 amp intermittent at 14 VDC If I remember correctly, I measured the current draw on my truck, it was about 9 amps when the starter was engaged.

I felt the same way about cutting off a good connector only to put a new one on. This is how I did my relay modification. The spade lugs plug right into the factory connector. I used same colored wires so I just match the colors when installing it. I did not have a piece of white wire for the...

"NAPA cannot find one for me" This will work with a minor modification. https://www.napaonline.com/napa/en/p/NDP6053401/

Start with this info. See if that helps. http://www.steelsoldiers.com/showthread.php?72880-Battery-Wiring-Maintenance&highlight=battery Sounds as if you have a bad connection or your batteries are not able to supply high current when needed.

Cut out 8 of those pesky rivnuts.

Change the glow plug temperature sensor and see if that corrects the problem. Your GP card thinks the engine is warm enough to start without heating the glow plugs but in fact it is not. Sounds as if you have a defective test lead or did not have a good connection when you tried to force the...

New cards are available Here http://www.glowplugcards.com/ And Here http://www.hillbillywizard.com/cucv-and-k30-parts/cucv-glow-plug-card-new/ You may want to inspect and test each glow plug as well to ensure that all of them are working correctly.

The glow plug relay is located in the engine compartment on the fire wall,drivers side, near the brake system master cylinder.

Some trucks have a "dead zone" where the engine temperature sensor is not providing a resistance value to the glow plug card to turn the glow plugs on. If the resistance from the temperature sensor is low the controller will not send the ground to close the relay. If the resistance from the...

Try manually closing the GP relay for 5-10 seconds the next time the engine is warm and will not start. See if it starts after you turn the glow plugs on for a short period of time. To do this, turn the key to the Run position, take a clip lead and attach it to the terminal on the GP relay with...

Updated photos.

My M1009 set up.

If your card made by BMI is not working, send it back and I will see that it gets repaired.

It is the small green component that is soldered to the board next to the large black 3 terminal transistor and the index slot on the connector edge of the card. The transistor has the stainless steel screw holding it to the board.