M998 Weird Starting Issue

[sbob4579]

Hi, I recently got a 1992 m998 HMMWV and when I start it, the battery voltage meter fluctuates steadily for the first 2 minutes. Could someone help me with this issue. Thanks!

 

[Lionel]

Perfectly normal as the glow plug controller continues to heat the GP's. I think only the S3 box stops this, but again, its normal.

 

[jeffy777]

What Lionel said... I think it is called 'Afterglow' I find it is a good warm-up procedure not to move until after the truck is finished doing this process. You could get a s3 controller and I believe that has no after glow.

 

[Lionel]

 

[Lionel]

Yes, I do the same with my '94, its the warm up period, unless its really cold out, then I wait till the temp needle starts to move. I wouldn't change it out unless you start to have problems sbob4579. Just my opinion, but why fix what isn't broken.

 

[DLJIII]

Mine does the same thing, I was afraid my batteries were weak or the alternator was acting up.
I dug around here and finally found the same answer but, I am glad you asked just as reinforcement for my peace of mind.

 

[sbob4579]

Thanks! Really appreciate it!