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I haven't pulled the positive on the back side of the battery box yet raining outside today but I'll make sure I do and clean it up. drove around some more and let it get good and warm then checked voltage at alt and battery and had 28.8v so just kind of random at this point.

well not out of the woods yet. so started the humvee and let her warm up and then picked up some stuff around town, I noticed that the voltage gauge no longer flutters its rock solid like all the other gauges. when I got home I checked the voltage at the batteries and got 25.1v I shut it off...

ya you got me thinking I cleaned the ground on the starter and on the alternator but not what feeds the battery box area and I was able to track it down with the multimeter.

I think I found the problem I have 28.8v at the bolt with the arc marks behind it but only 26.7v at the block behind it. bolt was to loose which is why it was arcing at some point im sure. Pulled the bolt and cleaned up the cable, bolt, and block. now I got 28.8v at the batteries will have...

looking at the metal tags between 2a and 568 is where I get 17.7v and between 568 and 68a is where a get 13.1 all on the regulator. I cleaned most of the vehicle grounds when I got it including the one on the alt and starter but I'll look over all the connections a little more.

Had both batteries tested this morning and both checked out good. the lower voltage one had 940cca and the higher voltage one had 1050cca both were warm and charged last night. swap the battery positions in the box and drove it around this morning and checked them again with the humvee running...

I'm gonna pull the batteries tonight and top them off on the charger than tomorrow I'll have them both tested. Batteries are less than 5 months old if one is bad I'll try to have it replaced as it looks to have a 2 year warranty but I didn't purchase them. Battery specs listed from fleet farm...

I do have a working trans light and it is off when the engine is off. I will get voltage from the batteries with it running.

something is wrong with the batteries. I just drove it about an hr ago and the top battery is at 12.3v while the bottom battery is read 13v. the wires mid way through have me worried not sure if that's right or not but it's how I bought it.

I should test the batteries individually I suppose there could be a problem there even tho they are newish doesn't mean there good.

at idle my voltage gauge is always bouncing between the red and green I would say the mid point is where the red and green meet. also at idle at the alternator it's reading 28.8v to 29v but I haven't checked at the batteries.

sry yes its just a bounce into the yellow it doesn't stay there

How much electrical dip is normal from turning things on like the headlights or fan? I noticed when I turn anything on it seems to work the system pretty hard. On the voltage gauge just turning the fan on high when idling will move the needle from fluttering right between the red and green down...