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**JRTJH** · 07-11-2019, 01:32 PM

Most bulbs are 921 "wedge base" bulbs but some fixtures still use 1156 or 7506 (P21W) base, so you'll need to check your fixtures to make sure which type you have. Typically it's going to be a 921.

Remember, many LED arrays are polarity sensitive, so if you get the fixtures working with incandescent bulbs and the LED's don't work, turn them over and they should illuminate. Newer LED arrays are not polarity sensitive but many of the cheaper, older ones are....

07-11-2019, 01:32 PM	#11
JRTJH Site Team Join Date: Mar 2011 Location: Gaylord Posts: 26,974	Most bulbs are 921 "wedge base" bulbs but some fixtures still use 1156 or 7506 (P21W) base, so you'll need to check your fixtures to make sure which type you have. Typically it's going to be a 921. Remember, many LED arrays are polarity sensitive, so if you get the fixtures working with incandescent bulbs and the LED's don't work, turn them over and they should illuminate. Newer LED arrays are not polarity sensitive but many of the cheaper, older ones are.... __________________ John 2015 F250 6.7l 4x4 2014 Cougar X Lite 27RKS