Charging system problem.

Did you check for B+ voltage at the wires connected to the alternator ? Could have a blown fuse or fusible link . Go to http://www.bbbind.com/free_tsb.html free wiring diagrams . Fill in your vehicle info .under system click on engine then under subsystem click on charging system . Look at diagram to see which wire has power an what fuse powers it etc. There are some good videos on youtube on checking charging system .

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if the alternator isn't charging it needs replacing , i don't see how a wiring diagram will help you

there are only 3 parts. but the causes are 25 or more.
1: belt missing slipping,
2: engine rpm below 800 RPM (lots of ways ,ask )
3: ALT had.
4: wiring to ALT bad.
5: bad battery or its connections, (wires)
6: bad fuse. see fuse link a11? on fFM page 20?
7: car is PCM alt controlled, it can be bad too. see 2 field wires on ALT and PCM on page 20? below?
8: battery temp sensor bad. making PCM think battery overheats.
the fSM covers all tests above.

pick car here, then pick charging.
5 alternators used on the 5 diffr.engines. got the wrong one?

the see wiring diagrams at end and chapter 20 inside, charge.
pdf page 118 for gas engine, if diesel next few.

You should be testing instead of throwing parts at it. Have the charging system tested in the car.

1998 trooper new alternator and still not charging and alternator bench tested good,
Check main 80 amp fuse in engine compartment and also check fuses in inside fuse box, there two in that one. first is engine fuse 15amp and the 10amp gauge fuse,

Here is the wiring diagram for the charging system as you asked for , also check connections, follow battery wire off the back of alternator make sure connections are good , that wire runs to engine fuse box and that is one fuse that i said to check it is 80amp, hope this is helpful good day

knowing the color codes can be a great help..usually in 12v reg system,from the regulator there are 6 white wire having a stripe codes,blue means neutral,green means field,black means ground to body,white means hot wired to +12v,yellow means to bat charging indicator going to instrument panel and finally red means to ignition....and always secure the regulators case to ground.

MOST NEW GM CARS YOU NEED TO ERASE LOW CHARGE TROUBLE CODE FIRST USING A CODE SCANNER BEFORE CRANKING VECHICLE.IF ALL READY DONE CHECK ALTERNATOR BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES AND CHECK ALTERNATOR FUSE.

GO TO AUTO ZONE - ADVANCE AUTO - OREILLYS. BUY A HAYNES REPAIR MANUAL.IT HAS WIRING DIAGRAM FOR EACH CIRCUIT.LIKE HEATING + AC CIRCUITS INTERIOR LIGHTS EXTERIOR LIGHTS STARTING + CHARGING SYSTEM WARNING DASH SYSTEM POWER DOORS + POWER WINDOWS + RADIO SYSTEM + CRUISE CONTROL + WINDSHIELD WIPER SYSTEM.ALSO HAS WIRING DIAGRAM FOR ALL THE PCM SENSORS.AND THE PCM ALSO.

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