I have disconnected both negative battery post and checked dc voltage from negative battery post to negative battery cable and get 12.49 vdc. Am I checking this correctly? I have pulled each fuse and disconnected alternator and most connectors under hood with no change in voltage. I also checked for raw wires under body and at all lights. Having problems with batteries staying charged. Just replaced both batteries with Interstate Batteries. If I let it sit for more than a couple days without cranking it has to be charged. Any suggestions?

 

Take a pic or two of the top of your engine, and post. Need to see the batteries and terminals.

Also, you are going to need to measure amps and milliamps on your multimeter. See what the reading is between the terminal (negative terminal) and the disconnected battery cable (amp setting first, and then if it is too low to read accurately, then with the multimeter on milliamps setting. Post the results.

All accessories off, and I would disconnect the underhood light.


Your issue may very well be with one of your "added on" accessories that you list in the signature.

 

I haven't watched this video yet, but knowing FordTechMakuloco, it is most likely very good.