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Thank you for the kind words and the update that your truck is now working properly. I will pass along your compliments to all involved with the cards.

I do not remember the zener diode number or value. But I suspect there are more issues with the card than the zener. You can test the GP's while still in the engine, remove the green wire from the tab and check the resistance from the tab to a good ground connection. Keeping the batteries on...

Sounds like your card has failed in a way that has latched the relay to ground. It would be best to get a new card and I would stop using a booster. My shop has seen several two way radios damaged from capacitive discharge type boosters. I would recommend using regular jumper cables from another...

Start the truck and then pull the card. Practice pulling the card out first with no power applied so you know how the get it out. As for export shipping. See if you can use someone that is experienced with shipping items out of the US. There are people that can provide that service. I know that...

I agree with Marcus. Get the truck back so you can work on it. Did you replace the GP relay with the proper one? It needs to be an isolated relay that has no common connection between the relay coil and the high current contacts. Proper replacements are a NAPA ST85 or a Trombetta...