'86 F150 losing battery charge over night
I have been searching for the cause of power leaking from my battery each morning for about 6 months. I have little battery power each morning if I have driven the car the previous day. However if I don't use the truck over a two day period, the battery is very dead. Engine is the 305 5.0 EFI.
So far I have replaced battery, alternator, starter motor, starter solinoid relay, ignition key module, starter switch, positive battery cable, brake light switch.
I have tried to run amp tests on the circuits and find nothing I understand as an abnormal draw. Does anyone have a suggestion as to how to proceed. The truck has 286,000 miles on it and I still love driving it. I don't want to abandon it. The only way to maintain power in the battery is to diconnect the neg. terminal each night. But that gets old real quick.
If you have no suggestions for testing the circuits can anyone suggest a repair manual that outines the procedure to check out the circuits?