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1991 dodge dakota sport 5.2 Alternator connector large one burnt up. changed alternator anyway. new (rebuilt) 120 amp autozone alternator not charging verified by autozone. could it be sbec (computer)? or could it be the little black box with 4 connections on top rear of alternator? tried 2 batteries both at 100% charge. still runs down battery to virtually nothing.
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I found that 1991 through 1996 Dakota are the 1st Gen Facelift. According to Autozone the 1993 and 1996 are the same engines. If you call your local junk yard they have a 100% accurate answer.
When you replaced the alternator, did you also replace the voltage regulator? I have read that on this truck, the voltage regulator is internal to the ECU and is located on the firewall near the ignition coil. You may be able to install a separate, dedicated voltage regulator available at your local auto parts store. Please note that you may have to rewire from the ECU connector to the stand-alone voltage regulator. Good luck.
Check output from alternator with a voltmeter it should be between 13.8 to 14.7 if so then check at battery if it is not at least 13.8 minimum to be charging then the big wire on back of alternator is not getting back to the battery through ammeter gauge in dash. I have hooked a wire from back of alternator straight to the plus[+] side of battery to fix that issue. Sometimes ammeter gauge burns out breaking the circuit from the alternator back to the battery.
There are a few things you can check. There should be a large fuse in the fuse box in the engine compartment. I believe it is a 100amp fuse. If you connect the jumper cables backwards or even touch the wrong post for a split second it can cause that fuse to blow. Also check the connector on the back of the alternator they sometimes are dirty or have a bad connection in the plug also check to make sure the connectors are not open and are making good contact. Do yourself a favor and check all the fuses inside the cab and in the engine compartment. Good luck and let me know if this fixes it, if not I will research it. I will look for your reply over the next few days
CODE 12 STAND BY MEMORY POWER LOST.WHAT IT SAYING ECM LOSING MEMORY BECAUSE LACK OF POWER.POSSIBLE CAUSE TO YOUR PROBLEM COULD BE OLD WORN OUT BATTERY CABLES CAUSING POOR GROUND AND HIGH RESISTANCE IN CHARGING CIRCUIT.YOU COULD HAVE WRONG AMP ALTERNATOR AND BATTERY WRONG COLD CRANKING AMPS.MAKE SURE ALTERNATOR BELT TIGHT AND CHECK ALTERNATOR BATTERY FEED WIRE AND ALTERNATOR FIELD WIRES FOR DAMAGE OR LOOSE CONNECTIONS.CHECK ALTERNATOR FUSE. WITH ENGINE RUNNING ALTERNATOR OUT PUT SHOULD BE 13.5 TO 14.5 VOLTS IF NOT ALTERNATOR NOT CHARGING.
You'll probably need a pulley puller for this job.Actually if you purchase the pulley from an Autozone they will lend you the tool for free.Deposit is small and is returned as soon as you return the tool. Why exactly are you changing the pulley, this is very rare, unless a large object struck the pulley. The alternator itself(bearings etc.) is usually the problem. Take the belt off and make sure the pulley is turning freely and most of all quietly. Thanks, Dana
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