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Posted by: 57lincolnman Feb 1 2017, 12:43 AM

Several years ago I replaced my standard headlamp bulbs with 100w bulbs. It seems that whenever I drive the car with the headlights on and come to a stop my voltage gauge goes well into discharge territory. Once I get moving the gauge returns to the charging side. This is really a problem in stop and go traffic with the headlights on. The alternator is a rebuilt Bosch unit standard for 914 and was replaced about 5 years ago. I'm thinking of replacing the headlamps with an HID set-up to reduce the load. Is this an alternator problem? If I run the fog lamps or put on the turn signal while stopping, the system discharges. Thoughts are welcome.

Posted by: dcheek Feb 1 2017, 06:25 AM

Try replacing the voltage regulator.

Dave

Posted by: McLovin Feb 1 2017, 09:04 AM

If it's like VW's, some voltage regulators are adjustable. I just did that operation on a beetle.

Posted by: 76-914 Feb 1 2017, 09:43 AM

If it's mounted in the console that is totally normal. Check the voltage w/ a VOM directly on the battery posts to verify. It should at least throw a charge above 1500rpm.

Posted by: malcolm2 Feb 1 2017, 09:45 AM

alternator belt tension?

Posted by: southernmost914 Feb 1 2017, 11:05 AM

Your voltage gauge in you center console is fed through the brake circuit and voltage will show a drop when ever brakes are applied. Not a great design and you can change the voltmeters source. At least it lets you know the brake lights are working.

Posted by: Mikey914 Feb 1 2017, 11:16 AM

Always check your ground strap. It's the easiest solution and hopefully it's it.