tail light running light not working but brake light does
#1
tail light running light not working but brake light does
2001 sportster 1200.
The tail light running light doesn't work but the brake light does.
With the ignition on I get 0.4V to the blue wire and 0.0 to the red.
With the brake depressed I get .2V to the blue and 12.0V to the red.
It's an 1157 bulb and when I have red to red and blue to blue connected both filaments light if I connect red to blue and blue to red only 1 filament lights both instances with the brake depressed. Any ideas?
The tail light running light doesn't work but the brake light does.
With the ignition on I get 0.4V to the blue wire and 0.0 to the red.
With the brake depressed I get .2V to the blue and 12.0V to the red.
It's an 1157 bulb and when I have red to red and blue to blue connected both filaments light if I connect red to blue and blue to red only 1 filament lights both instances with the brake depressed. Any ideas?
Last edited by wc00000001; 05-26-2018 at 07:29 PM. Reason: Additional info
#2
#3
Problem solved.
It seems the previous owner installed a regulator harness off the fuse box to work with the all-in-one LED tailight which had turn signals, running and brake light all in the tail light assembly. I removed the seat unplugged the regulator harness and plugged the two original connectors together and all worked.
My guess is the regulator harness controlled voltage to the LED tail light as there were only two wires going to the LED, hot and ground. So the regulator must have adjusted voltage so the LED circuit board knew which lights to illuminate. But this configuration did not allow any power to, what on a stock tail light, is the running light wire.
Thanks to all who chimed in with suggestions.
It seems the previous owner installed a regulator harness off the fuse box to work with the all-in-one LED tailight which had turn signals, running and brake light all in the tail light assembly. I removed the seat unplugged the regulator harness and plugged the two original connectors together and all worked.
My guess is the regulator harness controlled voltage to the LED tail light as there were only two wires going to the LED, hot and ground. So the regulator must have adjusted voltage so the LED circuit board knew which lights to illuminate. But this configuration did not allow any power to, what on a stock tail light, is the running light wire.
Thanks to all who chimed in with suggestions.
Last edited by wc00000001; 05-27-2018 at 10:03 AM.
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