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Alternator wiring is messed up when i bought my truck 89 silverado 5.7liter 350. I need help with wiring and i'm not sure if its the right alternator.I Switched out alternator still wont hold a charge. HELP!!!
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Car Radio Constant 12v+ Wire: Orange Car Radio Switched 12v+ Wire: Yellow Car Radio Ground Wire: Black Car Radio Illumination Wire: Gray Left Front Speaker Positive Wire (+): Tan Left Front Speaker Negative Wire (-): Gray Right Front Speaker Positive Wire (+): Light Green Right Front Speaker Negative Wire (-): Dark Green Left Rear Speaker Positive Wire (+): Brown Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Dark Blue Right Rear Speaker Negative Wire (-): Light Blu
Check belt, as well as voltage of battery when sitting and turned off, and voltage when running. Running voltage should be higher, showing charging, if not have alternator tested. Most big parts places will test that for free I believe. Don't forget to clean all your connections well while your at it.
Try a new distributer cap and rotor button,these are notorious for wearing out the carbon pick-ups and leaving carbon tracks in the cap which messes up the fireing order.If that does'nt fix it try plugs and wires.
CODE 43 IS ELECTRONIC SPARK CONTROL -.KNOCK SENSOR.LOOKS LIKE ALTERNATOR NOT PUTTING OUT ENOUGH VOLTS TO CHARGE BATTERY.YOU NEED 13.5 TO 14.5 VOLTS.CHECK ALTERNATOR FUSE AND ELECTRICAL WIRES.MAKE SURE BELTS NOT SLIPPING.IF ALL IS GOOD.REMOVE ALTERNATOR.LET AUTO ZONE CHECK IT.TO MAKE SURE.TURN OFF RADIO BEFORE MOVING BATTERY CABLES.SO YOU WONT LOSE RADIO CODE.YOUR CAR IS NOT GOING TO RUN RIGHT IF THE ECM DONT RECEIVE 12 VOLTS OR 13 VOLTS.
I can help regarding the polarity on my GMC 2500 Van alternator....
Facing the rear of the alternator, the red wire attaches to the screw terminal on the left. The black (grd) attaches to the screw terminal on the right. The top has a connector with 2 spade terminals. - one (left tab) is the "r" or relay terminal and the right one is the 'f' or field terminal.
Does this help... Red on left and blk on right....
-Jim
These trucks do have a regulator. But most importantly check all of your grounds. One bad ground can mess up an entire electrical system. Especially the charge.
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