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How To Repair HMMWV EESS S3

Retiredwarhorses

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I have the exact same issue with my nartron smart start box even after new plugs. Wait light turns off and its still sending 24v to the plugs and never out of the yellow. I hear the clunk turn off when turn off the vehicle. Any suggestions?
Your box is bad…24v for 9 seconds, after glow last 2mins, an S3 smart start sends a constant 5VDC for 2mins, previous start boxes pulsed 24volts for 2mins. If you have 24v after wait light? Your new plugs are now smoked.
 

Milcommoguy

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There's a good chance plugs are toast. Just replacing them and could have more toast. These cold mornings coming up and there will be a lot of toast on the HumV table.

Other choices are pancakes, waffles or a muffin.

Make the call, CAMO
 

TOBASH

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Seems like the perfect time
 

Mogman

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Welcome to the SS forums, there is very little component level information on these because there are so many different manufacturers/models and they were never intended to be repaired just replaced, there are certainly many other components bad including that MOSFET that has a big hole in it.
 
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