Why am I having electrical issues?
I have an electric issue after replacing my transmission on 2002 Ford f150 crew lariat. As far as I can see I did things right but when I went to start the truck it flickered the dash and nothing would happen. I can start it with a jump box. I have since ran a new ground from starter to frame and from frame back to battery. Something I've noticed when hooking up my jump box is that as soon as I turn it on it will start safety clicking so I'm assuming that's a positive line issue. Battery shows good voltage and after jumped alternator does it's job. What could be the issue?
crwdns2934109:0crwdne2934109:0
crwdns2889612:0crwdne2889612:0
0
Inspect the entire gap where the engine meets the transmission. Look for any wires caught in the "sandwich." Even a slightly pinched wire can ground out the positive signal to the starter or PCM. You also added new grounds, but the positive cable leading from the battery to the starter (and the fender-mounted relay) might be the issue. These cables often corrode internally over time. Check the terminal ends for corrosion or "crunchiness." If the cable is stiff or has green/white powder inside the insulation, it cannot carry the high amperage needed to turn the starter.
crwdns2934271:0crwdnd2934271:0 someperson crwdne2934271:0