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Underhood Light Mystery

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Old Jun 2, 2010 | 09:48 PM
  #1  
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St. Jude Donor '12
Default Underhood Light Mystery

This one is tricky...My underhood light contacts show 12v with a multi-tester, but it will not fire the lamp. Yes, the hood is fully opened and yes, I know the lamp works because it lights up fine when wired directly to the battery. I even went to the auto parts store and bought a new pack of two. All three lamps refuse to light. I'm going crazy trying to figure this one out! Anyone have any ideas? Thanks in advance. - Cool Arrow in Houston

Last edited by coolarrow; Jun 2, 2010 at 10:05 PM.
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Old Jun 2, 2010 | 10:06 PM
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Maybe when the bulbs are installed, the contact points aren't completely touching?
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Old Jun 2, 2010 | 10:13 PM
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I'd clean the contacts, if that doesn't work you might want to try running a temp ground wire to see if it might be your ground.
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Old Jun 3, 2010 | 01:34 AM
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Check for a good ground... you appear to have the power to it, but need a ground to return it.. also see if bulb is burned out (but doesn't looke like it is..)...Not sure run a wire free hand to the negative side of the light and see if it turns on. Good luck.
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Old Jun 3, 2010 | 04:11 AM
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mine doesnt work due to corrosion in the connector, check that
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Old Jun 3, 2010 | 02:04 PM
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I had the same problem. Disconnect the connector, clean them, spray them with electrical cleaner and re-connect. Worked like a charm for me.
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Old Jun 3, 2010 | 05:27 PM
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i wonder if my fridge light goes off when the door is closed?
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Old Jun 3, 2010 | 05:40 PM
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Thanks to all. Will checked all of the suggestions this weekend. To be continued...
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Old Jun 3, 2010 | 06:38 PM
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Good luck
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Old Jun 3, 2010 | 09:19 PM
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Is there a mercury switch in the mount? Maybe that is the problem?

How else would it know to shut off the light when the hood closes?
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Old Jun 6, 2010 | 12:32 PM
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Default Mystery solved!

Well, somewhat solved...I still don't understand why my previous light did not work as it showed 12v to the bulb contacts. That said, I found a used lamp receptacle with wiring lead here in town (Houston) for $10. I'm a firm believer in trying the easy route first. This means just peeling back the hood insulation and replacing the harness from the existing lamp to the connection below at the frame. Shazaam! It fired right up and worked beautifully! The old wiring harness went straight to the trash can before I can forget that it does not want to behave!

Thank you all for your replies,

Save the Wave, Mike
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