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Troubleshooting Difficulty Installing Replacement 921-Type Trailer Light Bulb  

Updated 08/28/2017 | Published 08/26/2017

Question:

Cant get replacement light in. Feel like idiot. Trying to push in and it doesnt go in. Help

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Expert Reply:

Trailer light sockets, such as those intended for a 921-type bulb like # 30-90-021 do use friction to hold the bulb in place in the receptacle. This can mean that a new bulb may present a fairly snug fit. You might try using dielectric grease like # LT37534 to both protect the socket and bulb contacts from potential corrosion and to act as something of a lubricant for installation.

You can also check that there is nothing from the original bulb base still inserted in the socket. It can happen that when the old bulb is removed the base can snap off and stay stuck in the receptacle, making it all but impossible to get the new one installed.

expert reply by:
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Adam R

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