Re: O/T Headlight Bulbs-Replace 1 or Both?

Posted by Tom in Central Pa on May 02, 2007 at 17:15:07 from (65.40.71.158):

In Reply to: O/T Headlight Bulbs-Replace 1 or Both? posted by neblinc on May 02, 2007 at 08:18:03:

You"re talking bulbs here, Look closely. Each bulb has two filaments, the vehicle is wired to feed the brighter filament in the high beam location. The vehicle is wired to feed the "low" filament in the low beam location. THE OTHER FILAMENT IN THE BULB WAS NEVER USED! I trade the bulbs in the hi&low position. Then when both filaments are burned out in a bulb, I replace the bulb.
In the 4 light sealed beams, the LOW usually goes out first. I replace the unit. But I save the unit, as the high side still works. The one prong is ground, one is low feed, the other is high feed. I remove the high prong, and solder a jumper wire across from hi to lo. Now I have a spare, two-prong, Hi beam replacement sealed beam lamp.
I rarely need to buy headlights!

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