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Found the problem. Ground issue from Neg. post front battery to the engine. Either front Battery Neg. to Buss Bar, or Buss Bar to rear Engine, haven't checked Any further, but will. All seems tight, but something going on. Connected a 10 gage jumper from Battery Neg. to Right Alt. bracket...

Ok, I got out my retractable leads and connected the control ground to Neg. terminal on battery no change. While had it out I backed up other grounds under the dash no change. Now starting to think in another direction. I have noticed lower volt reading from the dash gauge. It climbs up to...

Well not much progress. Using VOM at the GP Controller plug, I have 12.29 volts between Ing. 12v power pink/blk 39A And controller ground Blk 151A. I have sprayed and cleaned the connection to the GP Card, pulled apart and cleaned the four wire connector upstream from the card. Cleaned and...

Thanks for the help. I will recheck the grounds again. Have multiple digital VOM and my trusty Simpson 260. Appreciate the help and direction. Tom

Glow Plug Wait Lamp comes on at random while driving. I have searched and read numerous threads on this, but come up Empty, because of dead links, or never updated the fix, or not exactly my problem. M1028A2 Glow plug system operates as intended and starts fine. After starting the light goes...