HD directional signal
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Stage IV
Joined: Apr 2024
Posts: 4
Likes: 1
From: Kirkwood MO
HD directional signal
I have a 98 HD Heritage Softail. When the left directional is activated the right one turns on, most of the time. If the bike has been sitting on a trickle charger for a few days and the ignition is turned on It may work fine. When started the same error occurs, Left activates the right. The right works just fine, which is good as long as you don't want to turn left. Already replaced the module under the speedometer for $250. Anybody have this problem before?
Stage II
Joined: Jun 2025
Posts: 2
Likes: 1
From: Santa Catarina, Brazil
My first suggestion would be to check that the ground is solid. Use an ohmmeter to perform a continuity test between GND 1 and the battery’s negative terminal.
Next, verify that the TSM is receiving the correct signal. To do this, check for any short between the White/Violet wire coming from the left handlebar switch and the White/Brown wire (which carries the right signal) at the TSM connector using an ohmmeter.
Also, check the voltage at the TSM connector on the White/Violet (left signal) and White/Brown (right signal) pins, using a clean ground (battery negative) as reference.
If there's no short between White/Violet and White/Brown, you can assume the TSM is receiving the proper input.
The next step would be to check for a short in the main harness. For that, test continuity between the White/Violet wire at the front connector (left signal) and the White/Brown wire at the rear connector (right signal). If you get anything other than OL (open line), there’s a short in that section of the wiring, and it needs to be repaired.
Next, verify that the TSM is receiving the correct signal. To do this, check for any short between the White/Violet wire coming from the left handlebar switch and the White/Brown wire (which carries the right signal) at the TSM connector using an ohmmeter.
Also, check the voltage at the TSM connector on the White/Violet (left signal) and White/Brown (right signal) pins, using a clean ground (battery negative) as reference.
If there's no short between White/Violet and White/Brown, you can assume the TSM is receiving the proper input.
The next step would be to check for a short in the main harness. For that, test continuity between the White/Violet wire at the front connector (left signal) and the White/Brown wire at the rear connector (right signal). If you get anything other than OL (open line), there’s a short in that section of the wiring, and it needs to be repaired.
Stage II
Joined: Jun 2025
Posts: 2
Likes: 1
From: Santa Catarina, Brazil
Nice find. That detail really strengthens the short circuit theory — especially a ground issue.
According to the wiring diagram for this model/year, both the turn signals and the neutral switch share the same ground (GND 2).
Please, let us know what you find next.
Good luck!
According to the wiring diagram for this model/year, both the turn signals and the neutral switch share the same ground (GND 2).
Please, let us know what you find next.
Good luck!
Thread Starter
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Stage IV
Joined: Apr 2024
Posts: 4
Likes: 1
From: Kirkwood MO
I found out how to make the signals work. Press the right directional signal forward, kind of like a rocker switch. Then the left works fine. The current condition is the left signal will cancel itself after a minute or two, but the right does not cancel. So if anyone has a problem like this one, try this solution.
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