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What is your question?
Red battery warning light illuminated on dash. Changed alternator due to no output but problem remains. Getting 12 volts to battery terminal of alternator. Is there a bad relay or something. Thanks
2 Replies
The large Black/Orange wire at the alternator should have battery voltage all the time, yellow/light green wire @alternator comes from the power train control module, light green red wire should put out voltage if the alternator is charging and turn out the charge light on the dash, yellow white wire @alternator is voltage supplied to alternator. If the alternator is charging it should have 14.7 volts approx with the engine running at the large wire at the alternator to battery wire. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info or there is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You can get a one week subscription or year subscription very cheap. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual try http://bit.ly/mitchell_repair_manuals_online and get an online repair manual subscription.
To suppliment Patrick, often times the rectifier connector at the alternator can be damaged. Check it for melting or terminal issues.
Thanks so much for your help. I did notice that the rectifier wires were fused to the the large black orange wire and I did have to pull them apart. I thought maybe they came that way. I do not see any other physical damage however. Should I unwrap the rectifier wires. Is there a way to test these two wires to see if they are shorting?Thanks so much for your advice Paul I unwraped some of the black tape around these 3 wires. I see no evidence of melting. It appears there was a drop of glue holding the rectifier wire and larger battery wire in place. Only 12 volt (battery volotage) measured with engine running. I assume voltage regulator not working or receiving power. Any way to test each of the 3 rectifier wires? Thanks Paul
Yeah, you're not going to want to have those wires fused together! Are you checking the terminals on the alternator or on the wiring connector? Plugged in or not?
I checked the 15 amp fuse and it is good. There is only .4 volts off and .6 volts when car is running at yellow with white stripe at the alternator connector. The manual says it should be hot at all times. Therefore there is a short or corrosion with this wire. I am told frequently where it comes out of the battery junction box where the 15 amp fuse is located could be a problem. I will see if I can jump this temporrily to determine if this is correct. Paul There is no continuity in the yellow wire with white stripe from the battery junction box to the end of the connector at the alternator. Impossible to follow the entire wire since in huge harness. Any thoughts The final answer is that the harness was damaged in the front right wheelwell and that wire had corroded. It works fine now. Thanks for your help, Paul
The fuse being good is good info. The yellow with white stripe wire should be hot based on reading the wiring diagram. There is a connector between the alternator and the junction box that the yellow with white goes through - disconnect there and test?
Thanks so much for your response. I really appreciate you taking the time to reply.I noticed when I removed the rectifier wire plug-in connector from the alternator it was connected or fused to the large orange/black wire. I thought that was the way it came. Maybe there is a short inside. I will try to unwrap the covering to look at the two wires more carefully. I thought maybe there was a problem with a blown fuse. The alternator instructions suggested there was a large mega fuse in-line, but I see none, and I have 12 volots at the alternator. Thanks again I will seee how this works out Paul Voltage output is 12 volts.Is there a way to check each of the 3 wires going into the rectifier? Thanks Paul The final answer is that the harness was damaged in the right front wheel well and the wire had corroded. It works fine now. Thanks for your help Paul