Have a 1999 toyota 4runner and after hooking up a boat trailer, when I press the brakes my blinkers come on solid. If I turn on the blinkers, without pressing the brake they work but the minute I press the brake it either makes the blinker stop blinking or it will continue to blink but the other blinker will come on solid???
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Re: pressing brake causing blinker issue
Any trailer lighting harness will have seperate wires for brake and signal circuits. The brake circuit from your 4Runner must be connected to the signal wires of your trailer harness. Check the color codes.
Try unhooking the trailer light harness. Then try brake pedal.
This fault MUST have happened during wiring installation.
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Check the bulbs in the trailer. If you know someone with a trailer that you could hook up to try that too. A large majority of trailer lighting systems use a simple circuit pattern. Like Christmas lights. . . one goes out they all go out. etc. Some boat trailer lights will burn out if they are hooked up when it's backed into the water. The pain of trailer stuff is figuring out if its really the trailer or not. When the cover is off the lights make sure you take a good look at the guts of the light. The brass pathways will actually arc and melt. Ruining the light. If its not the trailer start checking the vehicle connections. Remember not to overthink things and start with simple stuff first. Oh and recruit a helper to push the brakes and run back and forth it will speed things up greatly.
I take it the blinkers and brake lights work ok when not hooked up to the trailer? If yes, then the wiring to the tow hitch is not hooked up correctly. How many wires to trailer pig tail connection? U can have up to 7 depending on what you tow. Check to make sure these wires are hooked up from the truck to tow plug correctly: 7 wired--- brown-Rt turn and brake light, yellow-backup, white-ground, blue-electric brake, green-tail running lights, black-battery charger, red-left turn signal and brake light. Let me know if u have something other than 7 wire, I'll get the wiring color and source info for u.