Trouble Shooting Wiring Issues on a 2006 Toyota Corolla
Updated 03/19/2024 | Published 03/09/2024
Question:
Im experiencing a bizarre trailer light problem and am hoping someone there can help. Two of your plug and play adapters have been tried. Two different trailers have been tried. Same problem. So it must be somewhere in the vehicle. Vehicle is 2006 Toyota Corolla LE Symptoms with engine running: 1.Turn on flashers. 2. Working on car but not on trailer. 3.Unplug, wait at least 3 seconds, replug. 4.Trailer lights now flash. 5. Both turn signals may now work but if only one, unplug and replug gets it working. 6.Same deal if turn signals are tried prior to flashers. 7. Anytime I park and turn off the engine, same exercises must be performed to get lights working. 8. The 3 second requirement sounds like a capacitor somewhere in the car is involved but have no idea. If you cant help Ill understand. Thanks, Harold
asked by: Harold R
Expert Reply:
Hey Harold sorry to hear you're having so many issues. It sounds like you've got an electrical gremlin in your Corolla. I recommend checking your battery cables and make sure the connection to the battery is as clean as possible. We had a guy here who drives the same vehicle and he was having all sorts of electrical issues and cleaning off the terminals solved his problems.
The other suggestion I have is to check all the grounds and wiring connections starting at the trailer connector and working your way forward to the front your Toyota. A lose ground or improperly connected power wire would cause the intermittent problems you are experiencing. The Curt T-Connector Vehicle Wiring Harness item # 55542 requires a dedicated power line ran directly to your battery.
Product Page this Question was Asked From
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- Converter
- No Tow Package
- 4 Flat
- Plug and Lead
- Plug-In
- Hidden
- CURT
more information >
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Harold S.
3/18/2024
Problem solved. Autos with LED tail lights need only around 1/10 the current as those with incandescent lights so the wiring is reduced by the same amount. When a trailer with incandescent lights is plugged in, there is a voltage drop across the smaller wiring. Not enough to make the lights that much dimmer, but the mosfet in the converter goes wonky if the correct voltage is not supplied. Installed LED's in the trailer and lights work fine.