Jeep Alternator Field Wiring

The alternator field current is substantially lower than the current output the alternator produces while operating. Supposedly the dark green wire is supposed to be the ground or negative field terminal on the back of the alternator. For example the alternator may produce 50 to 70 amperes during operation but the field current may only be a couple of amperes.

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If this sensor tells the pcm that the battery is too hot the pcm might refuse to power the field coil cause it thinks bad things might happen if the alternator tries to charge an overheated battery.

Jeep alternator field wiring. Another possibility is a bad battery temperature sensor. To check to see if your alternator is working unplug or remove the two field wires from the back of the alternator. If these are all good then you need to check the wiring between the pcm and the alternator or the pcm itself may have a problem. Dont make things harder than they are.

25 tj 1997 4 wire i took it off checked connections had it tested ok put back on checked fuse all good dont know what fuse is it anyway checked big wire for breaks or loose. It was pretty violent too it would cause the tires to chirp. With it running checked volts at alt output 12vto 118 and at battery test same. It reveals the elements of the circuit as simplified forms as well as the power and signal links between the gadgets.

Here is a wiring diagram for any car that used that alternator. Then ground one of the field terminals on the alternator and jumper the other. I checked all my wiring and everything seems fine. The important point is that the regulator and alternator field are connected to keyed power and the other alt field connection goes back to the regulator.

Go ahead and cookbook the wiring together the same way. The best part of testing your alternator field current is you dont need to turn on your engine. A faulty pcm is a known issue on the jeep liberty generally resulting from a short in the field generator wire which connects the pcm to the alternator. Both pcm and wiring need to be checked.

Switch not operating correctly and check charging system it started to get really bad and i barely made it home. Without a working alternator my battery was at 122 volts and one is supposed to read 3 4 volts less than that. Variety of jeep cherokee alternator wiring diagram. A wiring diagram is a simplified traditional pictorial representation of an electrical circuit.

The code is alternator field switch. Alternator field terminals both read full voltage when. I will be walking you through the steps involved in making sure the wiring is correct. This is a computer controlled alternator.

My rpms would bounce around and the motor would keep cutting in and out. After an alternator fault resulting in brief over voltage why does the hood opening warning light come on on a vehicle which has no hood switch. The pcm controls the ground side of the alternator rotor field circuit.