At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
there is a thick wire from the battery positive terminal, follow this wire down till you find a rubber cover over the cable the fuse is inside this and will need to be cut out and a new one fitted. If this is the problem, to check you need a meter and test the live out of the alternator to the battery terminal, or disconnect the battery and remove the wires for the alternator and find the line to the battery from the alternator and use a bulb to test the line using the earth and live with the battery wire back on. if these both show working. check the alternator. the bushes or regulator could be going, they can suffer from overheating over time
no standard fuse in a fuse panel some vehicles have a master fuse/link that attaches inline if looking to pull fuse follow battery positive to where it links up with alternator some are by battery some by radiator but if its a fusible link not going to be able to pull it ---and as to a regular fuse their is none and some vehicles dont have any short in alternator usually means no out put if short in wiring than would have a constant drain on battery --their is no fuse that would stop that if short in wiring test the lines and replace the wires their is usually about 10 ft of wiring --if alternator pull connector from it
Not sure but I believe the GMC Yukon has an in line fuse in the charging line. If so the output of the alternator will not get to the battery. One way to check is to measure the voltage, when the engine is running. At above idle it should be over 13 volts. Then measure the battery voltage, it should be almost the same within 200 to 400 mVolts. If not the charging line is open. Also if the alternator charging terminal is the same as the battery (12 to 12.7V) while the engine is running, that again indicates the alternator internal regulator is bad. If you turn on the headlights with the engine running above idle and the alternator output drops over a volt or so, the alternator is bad. This measurement can be taken at the battery plus terminal or the alternator charging output.
If there is no voltage of the Large Red wire that is bolted to the back of the alternator, then you have a wiring problem. This wire usually goes directly to the starter where it joins up with the wire from the battery. There is, in most cases, a fusible link installed in-line on this wire (not a fuse, a fusible link). If this line draws too much current, then the link melts ans acts as a fuse. Once it melts, there will be no charging voltage as the alternator output cannot get to the starter, or the battery.
Most charging circuits are in two sections, the section that charges the battery and the section that "turns on" the alternator when the engine starts. Your alternator has a built in regulator which is powered by a 15 amp fuse and a 7.5 amp fuse that also handles the gauge on the dash. These circuits would need to be checked with a meter.
Sounds to me like a loose battery connection, there wont be a line fuse for an alternator, if not a loose lead, then possibly a broken earth strap onto the engine, check security and condition of all battery leads, and eliminate any corrosion on battery terminals
FUSES ON THE DRIVER SIDE UNDER INSTRUMENT PANEL.CHECK FUSE LINKS YOU HAVE IN LINE FUSE LINK ON THE POSITIVE BATTERY CABLE. ALSO POSITIVE BATTERY TERMINAL.
×