Leaving the radio on all night would not cause the battery to drain away like this providing its a good one .try disconnecting the battery overnight and see if it still drains as sometimes a battery can drain flat on its own which is caused by sulphation across the internal plates in the cells ,then if if it starts the next moring the battery is ok ,so next is to discoinnect the alternator large terminal off the alternator and try that and if it starts the following day renew the alternator as a rectifying diode is down running battery flat ,if still a proble then out comes the tester to look for a relay that has the contacts stuck together or the favourite boot light but this is a pick up truck so i would suspect the alternator
You have a short in the electrical system that is draining the battery. You can use a voltmeter or test light to find the circuit with the short by removing a fuse and connecting the test light or voltmeter in place of the fuse. There should be no current present unless the ignition key is on. If there is current, then that circuit has a short to ground. Shorts are usually caused by insulation being rubbed off a wire and coming in contact with metal surface. The radio fuse should be in the fuse block located at the end of the dash on the left side of the vehicle behind a removable panel. The fuses are numbered and the inside of the removable panel will tell what each fuse goes to.
389 views
Usually answered in minutes!
×