dumb question. what is the difference between the 1156 or 57? And which one is used on the rear turn signals of a 06 street glide?

 

1157 is a twin element, 1156 is a single element. If your bike uses one of them it would be the 1157 for brake and runing light. If your turn single does not have a running light as well as a turn single then it would be the 1156. The 1156 was used mainly in multiple light configurations like the 62 Chevy or as marker light bulbs in older cars.

 

single element and dual element not sure what's in 06 SG turn sigs my guess is single

 

the 1156 is a single element there is 1 contact point on the bottom

the 1157 is a dual element there is 2 contact points on the bottom

if i remember right the 1157 is the signals-ride safe

 

HD is still using 1156/1157's not 2056/2057's?

 

Fronts should be dual filament (running & signal) rear should be single (signal only). Some guys change the sockets on the rear to dual so they can use dual filament for run/turn. Other guys add a run/turn/brake controller which then makes your single filament bulbs act like a dual filament.

 

The rear on my scoot (which has the SG bullet turn signals) is 1156 single filament bulbs.

 

the rear tail light bulb on my 07 is a 3157, which is a wedge type bulb. im not sure what year harley started using this type bulb in the rear light. i know my 01 roadking used a 1157 in tailight......