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08 Box Base Alternator


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Did an Alternator test by attaching a multimeter to my terminals with engine running. It read about 12 volts then proceeded to go lower, at some point down to 10.5.

I assume the alternator is not charging the battery or there is a connection problem, possibly the ground. The batt is not holding a charge either. Thoughts? V

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9 hours ago, vza said:

Ok.... so it could still be the battery even though I'm only getting 10 or so volts with the engine running across the terminals? V

 

Yes. A bad battery can act like a black hole for alternator output.  As Loren noted, get the battery load tested, if it is bad, replace it. If the alternator still has low output, it is probably the voltage regulator which can be swapped out as well.

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Ok...Battery tested good ...but ....it wasn't the correct battery for the car so I dropped in a new one. Measured voltage across terminals w/ engine running and got around 10.5 volts. I assume its the alternator or voltage regulator. Will check connections and ground. Any thoughts. Thanks V

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Managed to get my alternator out and I think I need more than Voltage Regulator. I noticed 2 wires burned up(pic of 1 of them) I guess these are wires to the Diodes. I did smell some electrical burning when test driving .....maybe the alt?  Would it be okay to use an alternate reman alternator ie.AC Delco. They are less expensive than the Bosch. Thanks V  

Alt.jpg

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  • 2 weeks later...

Ok so I got my reman Bosch alternator. The pulleys look the same on new as old but act differently. They both have a plastic covers which I think means they are a free wheel lock pulley. The old pulley turns the stator one way (not forward and backwards)if I stop the pulley the stator continues to turn(guess thats when its free.) The new pulley seems to turn the stator both ways ...forward and back and does NOT allow the stator to continue to rotate when stopped with your hand.(not free). I assume the free wheel mechanism engages at a higher rpm and the pulley is bad on my old one as well.V

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