I have a 53 M38A1 that I can't get to charge even after changing to a good voltage regulator, a different generator(24V known to work< and checking a cleaning all ground straps on the voltage reg and gen and still it won't charge. Any ideas what I might try now. I haven't tried a different cable hook up yet.
Thanks. Jack
M38A1 Charging Problems
- Glen
- G-Lieutenant Colonel
- Posts: 1170
- Joined: Fri Dec 13, 2002 8:10 pm
- Location: Quando Omni Flunkus Moritati
If the jeep runs and all the other electrical items work, then the ammeter is working. Even though you have installed a known good generator, you still need to polarize it. Disconnect the cable running between the Generator and Regulator. Note where the index tab is located (where the slot on the plug of the cable lines up) on the top of the elbow on the Generator. There are three female terminals in the elbow; you want the lower left terminal when looking in to the elbow. This is the FIELD terminal. Connect a wire to this terminal and quickly brush the other end on the hot terminal on the starter one time. The generator is now polarized.
Glen
WEll I did the polarizing trick and it is charging now, thanks for you input. The only thing now is that on occasion it will charge from 24.4 Volts to as high as 27.8. Sounds like a voltage regulator problem to me so will have to take a look at that. At leas t it is charging now. Thanks again
Jack
WEll I did the polarizing trick and it is charging now, thanks for you input. The only thing now is that on occasion it will charge from 24.4 Volts to as high as 27.8. Sounds like a voltage regulator problem to me so will have to take a look at that. At leas t it is charging now. Thanks again
Jack
- Felix
- G-Colonel
- Posts: 1386
- Joined: Mon Dec 16, 2002 12:49 pm
- Location: Los Angeles (left coast)
I just adjusted my voltage regulator last Sunday following the instructions that Wes K sent me, by the way, thanks Wes.
Instructions by Wes K:
"You'll need a copy of TM9-1825B Electrical Equipment (Auto-Lite) November 1952 or newer. Or TM9-1825A or C (can't remember) Electrical
Equipment (Delco Remy). If you have the Auto-Lite VBC4002UT or VBC4003UT look at the regulator from the side with the 2 electrical plugs to your left, the 3 major units are left to right: 1-Circuit breaker 2-Current regulator 3-voltage regulator. Usually problems are just pitted
or corroded contacks. File them very lightly with a ignition point metal file (or a girl's METAL finger nail file) then clean them by
passing a tape of thin cloth soaked in carbon tetrachloride or any top quality electric contact cleaner.Run her and see what you get.
Adjustment is straight forward for each. Circuit breaker armature air gap .000 to .065 and contact point gap .035 min. Current regulator
armature air gap .047 to .049 and gap between contact spring and stop is .010 to .016. Voltage regulator armature air gap is .040 to .042
and gap between contact spring and stop is .010 to .016. Contact pressure for CR & VR is 7 to 8 OZ's. Circuit breaker operatin ranges are
closing volts 25.7 to 26.7 and opening amps (discharge) 7.0 to 11.0. Current regulator operating amps 24.5 to 26.0. Voltage regulator
operating voltage at 70 Deg's is 28.30 + or - .40."
Instructions by Wes K:
"You'll need a copy of TM9-1825B Electrical Equipment (Auto-Lite) November 1952 or newer. Or TM9-1825A or C (can't remember) Electrical
Equipment (Delco Remy). If you have the Auto-Lite VBC4002UT or VBC4003UT look at the regulator from the side with the 2 electrical plugs to your left, the 3 major units are left to right: 1-Circuit breaker 2-Current regulator 3-voltage regulator. Usually problems are just pitted
or corroded contacks. File them very lightly with a ignition point metal file (or a girl's METAL finger nail file) then clean them by
passing a tape of thin cloth soaked in carbon tetrachloride or any top quality electric contact cleaner.Run her and see what you get.
Adjustment is straight forward for each. Circuit breaker armature air gap .000 to .065 and contact point gap .035 min. Current regulator
armature air gap .047 to .049 and gap between contact spring and stop is .010 to .016. Voltage regulator armature air gap is .040 to .042
and gap between contact spring and stop is .010 to .016. Contact pressure for CR & VR is 7 to 8 OZ's. Circuit breaker operatin ranges are
closing volts 25.7 to 26.7 and opening amps (discharge) 7.0 to 11.0. Current regulator operating amps 24.5 to 26.0. Voltage regulator
operating voltage at 70 Deg's is 28.30 + or - .40."
Felix (LtCol "Ground Spook")
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