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Yes they are. www.glowplugcards.com

I hope your daughter really appreciates you repairing her truck.:D

That's a great idea. Believe it or not, we have looked into making a remote LED board for the GP cards but the price to incorporate the change in the current PC boards would not be cost justifiable for the limited number of remotes that would be sold. It is a good idea and can be done very...

The GP cards have 3 LED indicators. GREEN -- Card has power applied to it. YELLOW-- Same a WAIT light RED -- Card is sending ground command to the GP relay

That's similar to what I did to my M1009. I added a volt meter that shows the voltage on the glow plug side of the relay when the glow plug relay is closed. After the glow plug relay opens, the volt meter indicates the 12 volt side of the vehicle electrical system. You could have a light in...

My 1986 M1009 was a US Navy vehicle.

Over voltage and reverse voltage are the most common reasons for GP card failures. Send me your card and I may be able to tell you what caused the failure. It might even be repairable.

I think a NAPA BR530 is what I used.

Got the shelter completed and installed on the truck. Used it for a rover operation during the PA QSO Party last weekend.

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.