Troubleshooting Low Voltage At Vehicle Side Connector for Trailer Right Signal Lights
Question:
2013 3500 ram hooked up to my trailer only getting left signal brake light and marker lights trailer breaks tested for power on the truck side got 12 volts to left signal and left break and 12 volts to marker lights right signal and break I’m getting 3 volts but it jumps around from 3 to 7 to 1 volt looked for broken wires nothing crouded wires there’s nothing fuses are good I’m out of ideas I know there a bad ground some where but not sure where else to look for it any suggestions that would be great And I’ve checked the tipm module everything is plugged in and nothing is curoded
asked by: Cam
Expert Reply:
Since you found low voltage when testing the right side signal light pin on the vehicle connector, you have at least isolated the issue to the truck. If all the wires appear to be in good condition, then the issue is likely either a weak ground like you mentioned, or possibly with the connector itself.
Starting with the easier potential solution, I recommend taking a look at the 7-Way on your Ram. Check for any debris or corrosion that might be built-up behind the pins, specifically around the pin at the 3 o'clock position, simply cleaning out as needed.
If this does not resolve the issue, then you will need to inspect the wiring on your truck starting at the back of the connector. It sounds like you have visibly inspected them, but I also recommend testing the wire at various locations to see if you can find exactly where the voltage drop starts. Also check to make sure the connector ground wire is attached to a clean, bare metal surface that is free of any corrosion.
If you are still unable to resolve the issue, please let me know and I will be happy to look into this further.
Mark R.
1/11/2020
Have a 98 Pontiac transport. Have done a new vehicle harness to lh tailight. ground to chassis is 0.00. ohms Parking lights work, and the plug reads 12.6 with engine running and battery voltage 13.9. For the stop/turn, voltage is 11.5, doesnt matter engine running or not. stop/turn very dim, not surprising with that voltage. What do think is going on. trailer works perfectly on different vehicle! Thanks
Jacob H.
1/15/2020
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Mark R.
1/16/2020
This did indeed turn out to be a weak ground. thank you for the response!