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low voltage

Bill in pa

Member
Steel Soldiers Supporter
134
40
18
Location
homer city pa
5 ton 1971 M813 a1 250 cummins.
I tried to start the truck today at lunch, started great this a.m.
Turned over very slow. tonight just click, click, click. Had to drift to start to get it home.
battery voltage reads 23.5 + to +........ 11.9 + to- .......
that's with the truck OFF. Volt meter on dash was in the yellow when running.
Any ideas, Batteries look good, date code not marked.
Im thinking alternator..
 

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