MEP-006A Help with Low Voltage Problem

[rose1111]

I am having trouble with the voltage on my generator (MEP-006A Military Generator). I can only get 166 volts coming to main contactor. It needs to read at 208 volts. I have done the following to try to fix it:

1. Replaced the excitation system assembly box
2. Replaced alternator
3. Replaced relay assembly box

Nothing I have tried is working. I am not sure what could be causing the problem with voltage and I need to get it up and running asap. Are there any suggestions on this?

 

[Scoobyshep]

Do You have the engine up to speed (60 HZ) where are you measuring voltage?

 

[Zed254]

TM-5-6115-545-12 has a troubleshooting guide. TMs here: https://www.steelsoldiers.com/threads/all-the-tms-you-need-for-the-mep-006a.155892/

Ac voltage too high
or too low.

Defective VOLTAGE
ADJUST rheostat.

Replace rheostat (para 3-110).

3-110. Voltage Adjust Rheostat.
See (54, fig. 3-18 and proceed as follows:
a—. Inspection.
(1) Gain access to rear of control cubicle
panel (96).
(2) Inspect VOLTAGE ADJUST rheostat (54)
for breaks, loose mounting, cracks, evidence of
corrosion, and other damage.
b—. Testing.
(1) Tag and unsolder leads from VOLTAGE
ADJUST rheostat (54) and test rheostat as described
for FREQUENCY ADJUST rheostat (para 3 -109),
except that the resistance value is 250 ohms ±3%
and the range is 0 - 250 ohms.
(2) Resolder leads to terminals as tagged.
Remove tags.
—c. Replacement.
(1) Removal.
(a) Tag leads and unsolder leads from
VOLTAGE ADJUST rheostat (54).
(b) Remove knob and hardware which secure
VOLTAGE ADJUST rheostat (54) to panel (96) and
remove rheostat.
(2) Installation. Install VOLT AGE ADJUST
rheostat (54) using removal steps in reverse order.
Solder leads to rheostat. Remove tags.

Exercising it with contact cleaner might be a good start vs replacement.

 

[Guyfang]

Have you ever seen this gen set work right? Have you downloaded the TM's?