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1990 M998 voltage problem

Mack93

New member
10
0
1
Location
North Carolina
I'm sure this may have been covered before, but while at idle the voltage is fine, right on the mark in the green, but while driving it creeps up in the red and stays there, mine has a 100 amp alt, any thing I should check? Everything seems to be working like it should...
 

simp5782

Feo, Fuerte y Formal
Supporting Vendor
12,091
9,248
113
Location
Mason, TN
I'm sure this may have been covered before, but while at idle the voltage is fine, right on the mark in the green, but while driving it creeps up in the red and stays there, mine has a 100 amp alt, any thing I should check? Everything seems to be working like it should...

Unplug the gauge and hook a connector to it so you can get it out in the cab and use a meter while driving or hook it to your batteries so see if your voltage is climbing or not to an unsafe level. Could be just a weak gauge. Never trust military gauges. Get a meter and do proper diagnostics to see where to start at.
 

Katavic918

Active member
523
54
28
Location
Maryland
Regulator is probably going bad. I was driving down the road and smelled batteries cooking one day. Looked at my gauge and she was pegged red. Ended up putting an alternator in instead.
 
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