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Old 12-06-2017, 10:21 PM   #2
Dead Parrot
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Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 1,045
Re: Identifying bulb purpose on instrument housing

Match the bulbs to the little plastic labels or holes in the cluster face. Possible that you have a few extra bulbs not needed for the equipment your truck shipped with. Or a previous owner swapped in a cluster from a truck with a different equipment setup.

It is possible the contacts are corroded. Pull the bulb holders and lightly sand the metal contacts where they touch the circuit board.

Also lightly sand the contacts on the cluster connector.

Pull and insert the bulbs into the holders a few times to clean those contacts.

Always suspect corrosion on a 30+ year old vehicle with electrical issues.

The clusters vary a lot depending on equipment level.
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