I just got a 95 F250 ECLB with 7.3 and E4OD. I love the truck and plan to do several mods down the road but it is overall a great truck and runs and drives great. Previous owners took great care of it.

My problem is it has been kind of sprinkling/raining here the last couple days and my battery light on the dash has started coming on when i come to a stop, but then goes off immediately when i start accelerating, then starts to flicker and come back on when i come to stop again. I figured it was either the alternator not charging or for some reason it was running off of the battery. But i checked both batteries with a multi-meter and they both show 14.5v while its idling. I even turned on the lights, signals, radio, and heat all the way up and it still read 14.4v at both batteries. I started it several times throughout the day expecting the batteries to be dead but it doesn't seem to be draining them and I really cant figure out whats going on. The batteries arent brand new but arent that old either. Probably 3 years or so.

The only thing i can think of is it looks like the PO put some heavy gauge wire running from each negative post on each battery to one of the bolts on the top of the rad support on each side. Could this be a ground thing where i need to put ground straps and terminals? The wires are just wrapped around the terminal screws now. Any advice is appreciated

 

The grounds should definitely be replaced and fixed since they are vital to efficient battery charging and preventing electrical problems.

The light flicker might be the single terminal plug/wire on the top of the alternator getting loose or worn. That would be the first place I check

 

Check the little plug on top the alt.

 

I also found I had to support the harness for the white plug a little better as it would vibrate and cause an intermittent light.

 

This combo cured my flashing light.

 

I have the same issue with the plug on my alternator. I have used Silicone sealant to hold the wire in place. It seems to hold it just fine. I may re-do it later if I have the battery light come on again.

 

Thanks for the advice guys that was the problem. When I went to wiggle the plug the wire came right out so I just spliced in a new one. Luckily I had an extra plug layin around from when I did the 3G swap on my Highboy .

Thanks for the help