Transponder problem

[ShadowBolt]

I have the TranX Pro DP-I transponder on my car. I was at MSRC Friday teaching Marshall, Michael and Bryan a thing or two about driving (just kidding of course) and when I went in to get my lap times the guy said he did not have anything from my transponder. Michael looked at it and said there was a light that should be on when the unit has power to it. It worked at the last event I went to but that was before I cut everything out and installed the Painless system. I checked the wires running to the unit and power is going to it and the other wire is grounded. The light is NOT on. Any ideas?


Jerry

[AI#97]

I have the TranX Pro DP-I transponder on my car. I was at MSRC Friday teaching Marshall, Michael and Bryan a thing or two about driving (just kidding of course) and when I went in to get my lap times the guy said he did not have anything from my transponder. Michael looked at it and said there was a light that should be on when the unit has power to it. It worked at the last event I went to but that was before I cut everything out and installed the Painless system. I checked the wires running to the unit and power is going to it and the other wire is grounded. The light is NOT on. Any ideas?


Jerry

Reversed polarity?

[AJ@PST]

The polarity may be a problem. Also double check the ground for the transponder. If both check out OK let me know and I can help by sending it back to AMB for service. Don't wait until the last minute to check out the problem because the turn around time from AMB is unpredictable.

[ShadowBolt]

There is a black and a red wire. I assume the red is positive (at least that is how I have it wired). I used my multimeter and pushed the probes into the wires (black into black and red into red) and I'm showing battery voltage.


Jerry

[ShadowBolt]

Should the light stay on all the time?



JJ

[marshall_mosty]

If the unit has power, then yes. I have mine on a toggle with the EFI system. If the car is running, the transponder is on as well.

[ShadowBolt]

Thanks Marshall.


JJ

[jeffburch]

VatoZone has a RF keyfob tester on the parts counter.
Next to the fob batteries.
I wonder if you took the transponder in there with a 12vdc power source and powered it up, the tester would see it?

Sounds like (regardless of the red led) it went nightnight.
Not the 1st I've heard of.

jb