Trailer hitch wiring yaris 2012

[Strider199]

Originally Posted by CTScott

Bulbs definitely draw more current, but unless someone installed some crazy wattage bulbs, the converter should have taken care of the issue. Can you take some resistance measurements on the trailer connector to see what you measure for each of the three pins to ground (assuming you have a 4 wire connector)?

Also, to verify your wiring, one the 2012 tail light connectors:

Taillight - Green wire on either right or left
Stop - Light blue wire on either
Right Turn - Sky blue wire
Left turn - Yellow wire
Ground - White/black (or bare metal bolt connection)

Those are the colours I connected to on that D-shaped connector going to the left tail light, the ground is mounted under the nut/stud coming from the light CTScott.
The bulbs on the trailer are just standard trailer bulbs which work great when hooked up to my Dads 2007 Yaris. I will try and get a resistance reading as you suggested (yes it's a 4 prong plug, one being ground) when the weather clears.
Could it be a faulty converter? I've never come across one in my time but I'm tempted to buy another one to see if thats it.

[CTScott]

Originally Posted by Strider199

Those are the colours I connected to on that D-shaped connector going to the left tail light, the ground is mounted under the nut/stud coming from the light CTScott.
The bulbs on the trailer are just standard trailer bulbs which work great when hooked up to my Dads 2007 Yaris. I will try and get a resistance reading as you suggested (yes it's a 4 prong plug, one being ground) when the weather clears.
Could it be a faulty converter? I've never come across one in my time but I'm tempted to buy another one to see if thats it.

It could be a bum converter, especially if someone bought it, cooked it, and returned it. To verify you could bypass the converter and hook up the turns, and brake only. The turns will flash at an odd rate, but at least that will verify that the car drives the bulbs and if so, the converter is bad.

[Strider199]

Great idea CTScott. I'll do that this weekend.

[Strider199]

So after work I tried to hook up the converter again.

I spliced in the running lights right to a running light bulb which I checked with my tester. Plugged in the trailer and the running lights where on.
I then spliced into the left signal light and tried that. Worked great.
I then spliced into the right turn signal and it worked great.
I then spliced into the brake wire at the bulb and had my son push the brake pedal. It worked great.
Thought I was all set but then, I put on the 4 ways. The rear trailer lights flashed but they were dim. I stopped that and turned on the running lights again, nothing. I tried the left signal, both signal lights flashed dim. I tried the brakes, nothing.
I SHUT IT DOWN.
Tomorrow I will pick up a powered trailer light converter and see how that works.
Why are they making the wiring in almost every car so frustrating these days?????????

[CTScott]

Originally Posted by Strider199

So after work I tried to hook up the converter again.

I spliced in the running lights right to a running light bulb which I checked with my tester. Plugged in the trailer and the running lights where on.
I then spliced into the left signal light and tried that. Worked great.
I then spliced into the right turn signal and it worked great.
I then spliced into the brake wire at the bulb and had my son push the brake pedal. It worked great.
Thought I was all set but then, I put on the 4 ways. The rear trailer lights flashed but they were dim. I stopped that and turned on the running lights again, nothing. I tried the left signal, both signal lights flashed dim. I tried the brakes, nothing.
I SHUT IT DOWN.
Tomorrow I will pick up a powered trailer light converter and see how that works.
Why are they making the wiring in almost every car so frustrating these days?????????

Ahhh, Looking at the 2012 EWDs I see the issue - The flasher functionality has been coalesced into the combination meter, instead of being a separate flasher relay assembly.

[Strider199]

Originally Posted by CTScott

Ahhh, Looking at the 2012 EWDs I see the issue - The flasher functionality has been coalesced into the combination meter, instead of being a separate flasher relay assembly.

Ahhh, and in laymans terms that means???? Sorry CTScott, I'm not following.

[CTScott]

Originally Posted by Strider199

Ahhh, and in laymans terms that means???? Sorry CTScott, I'm not following.

It means - Yes, you need the powered converter. Integrating the turn signal driver into the cluster means saving a few dollars and that it will have less drive capability.