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I had new aftermarket mirrors w integral LED signals in them. Identical to OEM style but in black. They are not working. I checked voltage in the lines and at the 4 pin connector coming out of the TSM. Left blinker at harnes registers 4. Right registers 0. I did get a split second flash of light from left signal when plugging harness back in but am unable to duplicate. Same reading in wires at point of connection to new signals. Tried temp connecting OEM signal to see if it would light up. Nothing. I’m assuming that both lines should register 12v, not 4v and certainly not 0. Since these readings are consistent at both the 4pin connected from lines coming directly out of the TSM and at the point of connection at the turn signal, my assumption is that I have a bad TSM. Any chance there are fuses feeding the TSM that I am unaware of and that is causing issue? Rear signal works perfectly fine. Bikes is a 2015 vrscf. It’s under warranty but I imagine the dealer will blame it on the aftermarket signals and I already know hey will take 2-3 weeks minimum to fix it. I’m ok w paying for a new TSM if that’s the issue. Just wanna make sure it’s not some other issue. I did the tsm reset sequence and it corrected fast blink on rears.
 

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I had new aftermarket mirrors w integral LED signals in them. Identical to OEM style but in black. They are not working. I checked voltage in the lines and at the 4 pin connector coming out of the TSM. Left blinker at harnes registers 4. Right registers 0. I did get a split second flash of light from left signal when plugging harness back in but am unable to duplicate. Same reading in wires at point of connection to new signals. Tried temp connecting OEM signal to see if it would light up. Nothing. I’m assuming that both lines should register 12v, not 4v and certainly not 0. Since these readings are consistent at both the 4pin connected from lines coming directly out of the TSM and at the point of connection at the turn signal, my assumption is that I have a bad TSM. Any chance there are fuses feeding the TSM that I am unaware of and that is causing issue? Rear signal works perfectly fine. Bikes is a 2015 vrscf. It’s under warranty but I imagine the dealer will blame it on the aftermarket signals and I already know hey will take 2-3 weeks minimum to fix it. I’m ok w paying for a new TSM if that’s the issue. Just wanna make sure it’s not some other issue. I did the tsm reset sequence and it corrected fast blink on rears.
The TSM has only one output circuit for each side. IOW, it doesn't distinguish front and rear signals. The VRSC models with OEM LED signals have front and rear turn signal modules that operate the LEDs. (The rear module is built-in to the taillight.) Since the rear signals are working, the TSM is OK.

You need to check the connections to the front turn signal module not the TSM. Here's a schematic of how the OEM turn signals are wired:

It's possible you damaged the turn signal module. There are no separate fuses for this.
 

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Did you measure the resistance across both the old and new LED arrays and is there a difference? The TSM uses a driver circuit to modulate the current into the LED array to control heat buildup and vary the intensity between running light mode and turn signal flash. The driver expects a certain resistance across the LED array to correctly control the light output and not damage the diode. Polarity is also important - after all, it is a diode.

LED Driver Description
 
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