Short in the tail lights?

Joseph

TJ Enthusiast
Original poster
Joined
Aug 20, 2018
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392
Location
North Jersey
Okay, so someone riddle me this

I notice both my tail lights are out today. I take the bulbs from my reverse lights and throw them in the tail light in a pinch since I was delivering for work.The bulb is a 1156a (?) bulb. The tail lights and brake lights worked, but the blinkers did not work.

I go to autozone, purchase a pack of 1157 bulbs as recommended. I put those in the reverse light. With the headlights/daytime light OFF and either side turn signal ON, my whole dashboard began to blink! This is where I thought I was doomed. The blinkers did not flash either. Once my lights were on, they still didn’t flash, but my blinker indicator on the dash remained solid and the dash didn’t blink. I didn’t check to see if the reverse lights actually worked because I didn’t have a hand at the time. Admittedly, the whole flashing dash freaked me out a bit too.

I decided to swap the bulbs around and all works well. I put the 1156a bulb back into the reverse lights where I took them, and put the new 1157 in my tail light/blinker. Keep in mind the Jeep thinks I have a front turn signal out because I didn’t use a resistor when removing the side markers. I only have a pair of front LED signals.

Dumb question maybe? I’d like to know why at least! Have had issues with the turn signals in the front in the past but it went away.

On a side note I put a pair of 6x6 LED pods in the front and a pair in the rear, switched up in the dash trim and man what a difference!

Thanks for any input guys. Hopefully not too dumb of a question if it’s actually supposed to do this as a warning.
 
Those bulbs are not interchangeable. Problems can also happen when bulbs are inserted backwards. The lock pins on the bulb bases need to be oriented properly before inserting and twist-locking them into the socket.
 
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Those bulbs are not interchangeable. Problems can also happen when bulbs are inserted backwards. The lock pins on the bulb bases need to be oriented properly before inserting and twist-locking them into the socket.
I assume then maybe I had put them in wrong. They seated down properly. Knew it was probably something stupid. Thanks for sharing the info
 
The 1157 bulb has two contacts at the base for the two filaments. The 1156 has a single contact for the single filament. You’ll notice the bayonet lugs are the same height on the 1156 because it has a single contact. In other words it doesn’t matter which direction it’s installed. The 1157 bayonet lugs are different heights because of the two contacts, it can only be installed in one orientation.

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