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Well I replaced the box today and no more amp draw I did notice the volt gauge doesn't drop during glow plug cycling system seems to run a lot better. On to the next project thanks for the help

I have the 60 amp alternator with a single regulator standard ground wire charge wire to excite key off battery voltage on all wires except ground thanks for the reply I'm interested to hear what your thoughts are

Great info thank you. Thinking about it when I strip the truck down for paint I didn't disconnect the batteries and I pulled all the lights should have did my research first thanks everyone for the help

Sometimes a little affirmation is good thanks for the help I got to control box, I'll be curious to take that one apart and see what's inside

I am a diesel technician I have a high and low amp probe I did as you stated and when you unplug the box the amp draw goes away also when you unplug the alternator the amp draw goes away I don't have schematics to see how those two work together to isolate which one it is and I don't want to...

Never.

No lights on and switch unplugged does not drop the draw.

I am also leaning that way. Just was hoping it was something simple and cheap. Thanks for your help

When I unplug the excite wire the small one with the boot the draw goes away there is battery voltage at both excite wires and the starter wire

The old light were in pretty bad shape I can't reinstall them

I have a 90 m998 that was running and starting great with no issues, I replaced the rear,front and side marker lights with LEDs and all of a sudden i have a 3 amp parasitic draw, I unplugged the alt. (60 amp) from system and draw goes away and the protective control box the draw goes away. I...