Jack Posted April 8, 2008 Share Posted April 8, 2008 Evening folks. My rear lights keep blowing on my GMC - just the side lights not the brake lights....:confused: Not instantly but by the time I come back from a drive out. Has anyone come across this before? And what could the problem be? Best wishes. Jack. Quote Link to comment Share on other sites More sharing options...
Tony B Posted April 8, 2008 Share Posted April 8, 2008 Jack if it is only the rear bulbs blowing then most likley culprit is the main feed wire running the length of the truck, the insulation may be breacking down causing a short. Are the bulbs wired on a seperate brake light and tail bulb or are the bulbs dual filamnet? If they are dual filimanet, then a good clean up inside the holders may cure the problem. This sounds like a muck problem. with vehicles waking up for spring the metal worms will show. The metal on the bulb base and the steel holders can react as electrolitic corrosion, this causing bulbs to blow is relativvly common. Quote Link to comment Share on other sites More sharing options...
R Cubed Posted April 8, 2008 Share Posted April 8, 2008 Sure the new bulbs you are fitting are 12 volt and not 6 volt He He He.... Quote Link to comment Share on other sites More sharing options...
Tony B Posted April 8, 2008 Share Posted April 8, 2008 Well dual filament brake bulbs are 5 watt aand 21 watt. If the brake pedal filament shorts to the side bulb the effect is the same as doubling the voltage. Quote Link to comment Share on other sites More sharing options...
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