Question about Volkswagen New Beetle
New alternator and new battery. Check engine light is on.
Need a repair shop-- don't you?
Or a different one than the one that left
you in your present condition of not
properly diagnosed & resolved.
Posted on Jul 20, 2013
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Posted on Jan 02, 2017
Hi, I can't tell you exactly what is wrong because there is too much involved at this point, what with 2 shops working with it, but I can give you some advise on what else to check. On the alternators and the wiring that supports them a small volt charge is taken off one of the slip rings, where the brushes ride, for the purpose of turning out the light. As I remember, this is a yellow wire that runs back to the dash.
To the alternator, it would be one of the wires that plug into the side of the alternator case.
Posted on Nov 27, 2008
Here are a couple of ideas for you to try. First check in the power ditribution box under the hood, there is a fuse for the charging system, either use a circuit tester or just pull each fuse one at a time. Usually it is a 10 amp fuse as it is on my 94 cherekee. if you find any bad fuses replace them with same type and amperage. you should also check the fuse box on the right side of the dash, door has to be open for acess to the cover on the end of the dashboard, check all of those fuses also. If you live near an AUTOZONE auto parts store, take your jeep there and they can test your alternator on the vehicle , or you can remove it from vehicle and take it inside, they can bench test it. If you have a volt meter you can test it yourself, start vehicle, set meter to volts at least 20 or higher , place black probe on negative post on battery, red on positive, look at readout, a good alternator will put out 13.5 to14.0 volts, which is how much it takes to run vehicle and accesories and charge battery. If alternator doesn't put out 13.5 to 14.0 volts it is defective. I hope these ideas help.
Posted on Mar 25, 2009
Take it to another auto parts store to test to verify.
If you put a voltmeter on the battery when the T+C was running, it should read 14-15V.
It could have a bad diode. If this is the case the alt. will be pumping out AC instead of DC. This is BAD. Batteries do not like this and the battery will fail because of it.
Be careful in those 'auto parts stores'. I have found that they employ alot of 'kids' who know little about how a car works. Try NAPA. They are much more knowledgeable and professional. But they cost alittle more.
Posted on Jun 12, 2009
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