Electrical charging system question, Alternator? |
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Electrical charging system question, Alternator? |
rjames |
Jun 10 2006, 04:11 PM
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#1
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I'm made of metal Group: Members Posts: 3,974 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest |
I installed a brand new battery and a new voltage regulater last week in the car. My volt meter is showing 12.5 volts at the terminals. With the car running and the lights and fan on my volt meter fluctuates between 12.7 and 12.9, then slowly starts to dip, getting as low as 12.5 before I decided to shut the engine off because I could see that the battery was slowly draining.
Would it be logical that the alternator might need replacing? The alt. belt also seemed tight (not sure exactly how tight it should feel though.) I can check the electrical connections (have to find them first though.) The connections at the battery all look good though. It doesn't look like a fun job to replace the alternator, but I'm up for the challenge. Anything else I should look for before I go this route?? Thanks! PS: Forgot to add that the alternator light on the dash comes on when starting the car, but goes off right away once it's started and doesn't come back on at all when driving. |
Dr. Roger |
Jun 25 2006, 11:24 AM
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#2
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A bat out of hell. Group: Members Posts: 3,944 Joined: 31-January 05 From: Hercules, California Member No.: 3,533 Region Association: Northern California |
when you observe 12.3 V at idle and then you put a load on the system like high beams and bring the engine up to 1500 RPM's you should observe that the battery never drops below 12.3V. you should see a voltage fluxuation up and down and up ...
the voltage regulator senses a particular voltage and kicks on (a low voltage state) until it senses another voltage ( a fully charged state) then stops charging... voltage regulators vary their trigger voltages and some are even adjustable. 12.3V could be you voltage regulators low voltage trigger point. does it ever get so drained that you cant start your car? i ask because i bet it never goes below 12.3V as this is your regulators low voltage trigger point. |
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