Engine Off, Lights Flicker

[StackJ]

When I turn my key on, my lights flicker (rhythmically) and my amperage goes low to normal to low. There is a clicking, which I assume to be a pump somewhere.

Engine starts fine. Lopes a bit when it is cold but idle evens out pretty quickly (2 minutes).

Belts wobble a but when running but I've tightened everything I can. (and that would not be related to when the engine is off.)

Any thoughts here on what the flickering might be?

(Recent adds: Grounding kit, LED Dash lights.)

 

[Dock Rocker]

When I turn my key on, my lights flicker (rhythmically) and my amperage goes low to normal to low. There is a clicking, which I assume to be a pump somewhere.

Engine starts fine. Lopes a bit when it is cold but idle evens out pretty quickly (2 minutes).

Belts wobble a but when running but I've tightened everything I can. (and that would not be related to when the engine is off.)

Any thoughts here on what the flickering might be?

(Recent adds: Grounding kit, LED Dash lights.)

Does it quit after about a min? If it’s only at startup and only for a short time that is the glowplugs continuing to cycle.


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[Wire Fox]

This sounds like glow plugs cycling. All boxes except for the newest S3 will have the glow plugs cycling on and off for about 2 minutes from key on, even after the wait to start light has gone out. Your headlights probably pulse a little bit with the engine running for the first couple minutes, if you look close enough.

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[frank8003]

You asked at the right place......to help resolve say which controller is in your truck.
View attachment HMMWV S3 HMMWV box.pdf

 

[StackJ]

I had noticed the pulsing when the engine was on. I looked and have the old controller. (Nartron, black, old model, #s too small for my old eyes to read).

I read this thread about the boxes.... https://www.steelsoldiers.com/showthread.php?144903-EESS-PCB-replacement-for-the-HMMWV

Lots of gold there. From my read, if it works, don't fix it. I'll order a backup new model when I have some extra budget.

Thank you! I can relax now!

 

[86humv]

Note :
Trucks with 60 amp units all have belt flap....if they don't, then there to tight.
To tight will mess something up.
Seen a truck on base once that someone added a idler to the belts for the flapping .....it looked good.
Could not take a pic as no cameras aloud.