DS650 blew BOTH circuits in the taillamp. Replaced w/ LED 1157 and only running light worked, brake light didn't. Tried 2 leds & same problem w/ both. Put a new 1157 in & both circuits work! [img]i/expressions/face-icon-small-confused.gif[/img] Any ideas?? [img]i/expressions/face-icon-small-disgusted.gif[/img]

YES, these were 1157s.

KenS

 

this is what i run on my bike led Tail light

 

Sometimes when 1 of the filements in an 1157 blows, it can "jump over" and take out the 2nd filement. This is not that uncommon.

If you look on the bottom of the 1157, there will be 2 contacts that look like drops of solder. If you ground the outside of the base and apply positive to 1 of the contacts, then the bulb should light. Apply positive to the other contact, and the bulb should also light. One of these contacts will light the bulb brighter--this is the brake light circuit.

If the conventional 1157 works but the LED 1157 doesn't, then either the LED 1157s are both bad (duobtful), or the contacts on the base are not making proper contact that are in the base of the socket.

Okey? [img]i/expressions/face-icon-small-smile.gif[/img]

 

Yeah, I doubt that both are bad, but also doubt that both are having trouble making contact. Did notice that the contacts are bigger (longer across base, oval shaped) than the stcks (round). Maybe crossing somewhere or grounding??

KenS

 

If they were grounded, a fuze would blow.

Secure a jumper wire to the positive battery terminal (with a clamp or ViseGrips). Take the LED 1157 and hold the outside base of the bulb to the negative terminal of the battery. Touch the other end of the jumper wire to each of the terminals on the bottom of the bulb. The filements should light.

When you remove the bulb from it's socket, you can see the 2 terminals that the bulb makes contact with. Those terminals are mounted on a nonconductive material. Underneath that terminal plate is a spring that puts upward pressure on the plate. If that spring is weak, or if the wires going to it are restricting it's upward movement, that could cause your problem.

Also, make sure that the LED 1157 is FULLY rotated into it's proper position!

Let me know what you find.

 

I'll check that tomorrow. Works fine when I put a stock light in there. They ARE fully rotated.