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NEWS | March 29, 2023

MRAP: Troubleshooting 10-Amp Fuse Could Solve Problems

BLUF:  Check the 10-AMP fuse on your MRAP’s C51 connector before attempting in-depth troubleshooting.

Mine Resistant Ambush Protected-All Terrain Vehicle
Photo by Cpl. Michael Curvin

Maintenance leaders, do you have an MRAP vehicle that won’t crank and the transmission shift selector display is blank? To make matters worse, there aren’t any fault codes on the maintenance support device (MSD)?

Driver side of M-ATV with open engine compartment
Driver side of M-ATV with open engine compartment
The problem just described could mean you’ve a blown 10-AMP fuse located on your MRAP’s C51 connector along wire 336 in the engine compartment, near the firewall on the driver side of vehicle. If that fuse is blown, then it won’t provide power.
10-AMP fuse on C51 connector in engine compartment
10-AMP fuse on C51 connector in engine compartment

Currently, the troubleshooting steps in the MRAP TMs don’t require you to check the 10-AMP fuse, which could cause you to replace the entire wiring harness, NSN 6150-01-576-4550. That costs about $723 when you may only need to replace the 10-AMP fuse, NSN 5920-01-123-5211. You can get five (5) of the fuses for less than $1.

10-AMP fuse on C51 connector with fuse cover removed
10-AMP fuse on C51 connector with fuse cover removed

TACOM is updating the TM 9-2355-335-series to add a fuse check. Make a note until the TMs are released.
This info applies to all MRAP models, except the SOCOM M1245A1 M-ATV.
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