Grounds are the way to go to start your search for a fix. Replacing the main cables that were mentioned is probably a good idea for peace of mind on the old trucks. Also, here's the place for some free FSM's. Resources - https://forum.ih8mud.com/resources/
HAMOM Parasitic Draw/Ground issue.
- Thread starter Ghostrider I
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- cruiser diesel draining electrical issue
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Turn it off. Disconnect the ground wire from the battery and connect a 12 v test lamp between the negative battery terminal post and the negative cable. If the test lamp light up even dimly then you have a draw. Have someone look at the lamp and pull each fuse one a time. If you see the light go out then it's in that circuit. If you pull them all out and nothing makes the light go out then pull the starter and alternator. Likely a diode in the alternator if that is all that is left.
This is a great test procedure. I'd replace the light bulb with a multimeter on Amperage instead of a light bulb, just in case there are multiple sources (not likely) you can see the actual power draw.
My money would be on the alternator.
Ramon- I’d bet diode in the alternator as well - hope you been well!
You too, John. It's been a minute.
