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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...

I did check the lower case g and k today and it came in at 4.4 ohms so that's reading good.

you are indeed correct should be much easier now that I see the right ones, I'll have to do a little more playing around and see if I can get the tranny plug off or lower the trans enough to get at it for the rest of the testing.

pulled the j1 connector at the TCM and k and g are not in use. was unable to get the connector off at the transmission just not enough room to get my hands up in there.

Thanks your post are a lot of help.

I have not thanks for that. I should be able to do all that expect install the test cable as that's not something I have. Figure while I'm in there I'll pull the valve body and clean it up.

hello, I have a new to me humvee with the N/A 6.5 and 4l80e transmission and have been changing fluids and doing some little maintance and driving around town. everything seems good except the transmission seems a little confused if it should shift up or down in overdrive. found on here how to...