1157 Bulbs burnt out
My back up light on the driver side burnt out on our last trip. Then when moving the motor home here at the house I noticed the brake/turn signal bulb was out now too. Removed both covers to find c...
Forum Discussion
1157 is the two element bulb. 1156 is the single element bulb. The side pins on both bulbs are positioned different so you have to use the correct bulb to fit the socket. RV manufacturer probably got a boat load of lights with the 1157 configuration, but the design of the trailer called for a single element bulb. So the manufacturer ran only the single wire to one element, even though the socket had wires for 2 elements. Had both elements been wired into 1 wire, I don't think it would have been much brighter anyway.
