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Registered
Join Date: Apr 2007
Location: Walnut Creek, CA
Posts: 20
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Left Front Headlight - Repeated Burnout - 1989 Carrera 3.2
Good new bulbs, (Currently Heliolite 9004 - Halogen) keep burning out, though handled correctly.
History in last 8-9 months between 93,000 and 98,000 miles is: Left bulb - low beam burned out & replaced Dipper switch portion for low beams failed and took down both bulbs All parts replaced Replacement dipper switch, portions for both high and low beams failed, initially low then high beams, taking down both bulbs All parts replaced Both bulbs again failed Relay kit added for protection Left bulb low beam then failed and was replaced Last night bulb for high and low beam elements failed. I do a lot of two lane road mountain driving, where headlights are useful. Any suggestions appreciated. |
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01-13-2008, 01:12 PM
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Registered
Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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Bulb brand? I'm not familiar with Heliolite 9004, but what do I know? Bad batch is possible. Try another source/brand.
Handled correctly? As in, "used cotton gloves or equiv. so no skin oil transfer to glasss"? Clean with rubbing alcohol before installation? Check charging voltage at the battery. Should be no more than 14.5V max. Sherwood |
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01-14-2008, 12:27 AM
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Registered
Join Date: Dec 2004
Location: PA
Posts: 1,162
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Left Headlight assembly loose?..vibration..
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01-14-2008, 02:41 AM
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I'm with Bill
Join Date: Jun 2005
Location: Scottsville Va
Posts: 24,186
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Quote:
__________________
Electrical problems on a pick-up will do that to a guy- 1990C4S |
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01-14-2008, 02:52 AM
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Registered
Join Date: Aug 2007
Location: Woodstock, IL
Posts: 238
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I also agree about the charging voltage. A slightly higher voltage can drastically shorten bulb life but is not likely to cause both bulbs to fail at the same time. I would guess either faulty bulbs or a voltage surge in the charging system from a bad votage regulator or faulty connection.
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01-14-2008, 07:32 AM
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Registered
Join Date: Apr 2007
Location: Walnut Creek, CA
Posts: 20
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Thanks everybody for the rapid responses, and good suggestions. Voltage held at 14.35 when measured at 2200 rpms, however a spike could be the explanation, though I'm not sure how to test for it. Meanwhile, I will check all the connections.
Is the ground for the headlight just a wire to the bucket, the frame or what should I look for? |
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01-14-2008, 01:18 PM
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