alternator wiring
05-13-2012, 05:59 PM
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alternator wiring
i used the 98 alt and took it apart and swapped the rear section so the 3.0 harness would plug directly in. i dont think it is charging b/c my battery kept going dead.
i jumped it off and checked the voltages at the round plug. the red wire and white wire have 12v but the yel/blue does not have anything. from looking at the wiring diagrams it looks like this should be getting 12V from the dash indicator. is that correct? just hoping to narrow down what i need to search for
i jumped it off and checked the voltages at the round plug. the red wire and white wire have 12v but the yel/blue does not have anything. from looking at the wiring diagrams it looks like this should be getting 12V from the dash indicator. is that correct? just hoping to narrow down what i need to search for
05-14-2012, 09:56 AM
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I just got my swap running so I haven't had a chance, but I'll throw some voltmeter leads on there tonight and see if the alternator is charging the battery.
i used the 98 alt and took it apart and swapped the rear section so the 3.0 harness would plug directly in. i dont think it is charging b/c my battery kept going dead.
i jumped it off and checked the voltages at the round plug. the red wire and white wire have 12v but the yel/blue does not have anything. from looking at the wiring diagrams it looks like this should be getting 12V from the dash indicator. is that correct? just hoping to narrow down what i need to search for
i jumped it off and checked the voltages at the round plug. the red wire and white wire have 12v but the yel/blue does not have anything. from looking at the wiring diagrams it looks like this should be getting 12V from the dash indicator. is that correct? just hoping to narrow down what i need to search for
05-14-2012, 06:11 PM
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ok got a little more info. there is 12v at the 7.5A CHARGE fuse. the bulb on the dash does not light up when the key is turned on. pulled the cluster and there is 12v on both sides of the bulb (meaning the bulb has power but no ground to make it light up) swapped it with a known working bulb just for the heck of it and it still does not turn on. from what my wiring diagram shows if i have power at the fuse it should be getting power to the alternator yel/blue wire.
any ideas?
any ideas?
Last edited by QuickSilver74; 05-14-2012 at 06:15 PM.
05-14-2012, 06:35 PM
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i can swap it out. i think it is a problem with the alternator itself. i am going to try to ground the yel/blue wire tomorrow and see if the dash light comes on. if it does then i know the alternator is not grounding the wire like it should
Last edited by QuickSilver74; 05-14-2012 at 06:36 PM.
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05-14-2012, 06:41 PM
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05-14-2012, 06:47 PM
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On the 3.4L, there should be a ground strap from the back of the passenger side head to the firewall. Another two eyelets attach just forward and below where the diagnostic box attaches to the upper intake manifold on the driver side, at least in the original configuration.
Last edited by rworegon; 05-14-2012 at 06:49 PM.
05-14-2012, 06:54 PM
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the only grounds i have are battery to block and then battery to body just beside the battery post. i will add a couple of engine to body grounds and see what happens
05-14-2012, 06:56 PM
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On the 3.4L, there should be a ground strap from the back of the passenger side head to the firewall. Another two eyelets attach just forward and below where the diagnostic box attaches to the upper intake manifold on the driver side, at least in the original configuration.
05-15-2012, 03:41 PM
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i checked today by grounding the yel/blue wire and the dash light comes on. could have saved time yesterday by doing that vs pulling the cluster!!!
so it looks like the alternator is the problem. i am swapping it out for a new one tomorrow and am going to just rewire the plug to use the 98 alternator harness.
so it looks like the alternator is the problem. i am swapping it out for a new one tomorrow and am going to just rewire the plug to use the 98 alternator harness.
05-15-2012, 07:49 PM
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I'll update the build thread and the alternator thread when I confirm and also load the alternator up.
05-18-2012, 06:22 PM
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the alternator was bad. got a new 3.4 one on there and swapped the old plug to the new 3.4 style one and it is sitting pretty at 14V now. also got a new battery just to be on the safe side
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