Thanks for bringing up the question on Inline Tube. I forgot all about them.
I have seen good reviews from users of their products.
I will have another CUCV rebuild coming up soon, so I will revisit the web site and see what they may have available for my truck.
It would have been in the last 2 years. So things may have changed. But it was surprising that they do not have a cross reference for OEM numbers.
It looks like they may have added many items since then.
I called Inline tube to purchase brake lines and they flat out told me "They did not make any brake parts for any vehicle over 3/4 ton". I asked them if they could cross reference a Chevy P/N to Inline part number, and again the answer was no. "They have no way to look up a mfg P/N to see if...
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...
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