I’m working on my neighbors truck it’s a 96 f150 4.9 l6. It ran a bit rough when he showed up with it so I replaced the distributor rotor plugs and wires. A few weeks later it wouldn’t start we towed it to a mechanic. He replace coil but mentioned both the rear blinkers had burned out while it was there. So it was running fine for a week and all the sudden now it’s acting like the alternator is bad. If you charge the battery it will just drive until the battery dies. I put a multimeter on the alternator while running and the readings were all over the place. I took the alternator off and looked at the voltage regulator and everything looked fine. He took the unit into a local auto parts store to be bench tested and they said it’s bad. Before I let him buy a new one I thought this has to be a bad ground or Ecuador or something making electrical stuff across the board go out. I was wondering if anybody has any input on where to start.

 

I would start with some more specific information. Your statements are very vague and incomplete.

 

I can't even follow what's happening to the truck. Running rough - taillights - alternator - Ecuador???

 

Sorry I was possibly high and using voice to text while driving a school bus full of handicap children on a field trip so i’ll Try this again. This is where I’m at now. The truck won’t hold a charge. My multimeter at the alternator was jumping from 0.0 to O.L. The battery read around 12v while the truck was off and 14.5 while running. Replaced the voltage regulator on the alternator. Didn’t help... replaced the alternator didn’t help. When I charge the battery it seems to hold a charge but drains once I start the truck. Sorry if this all seems elementary if anybody cares to help I’d appreciate it . Thank you

 

The ECU it’s short for equadorial computing unit it’s only in this “Garth brooks” special edition it’s for the tv screen, back massagers and mini fridge