When I turn on my right turn signal, then apply the brake, the signal
blinks at least twice as fast as normal. When I take my foot off
the brake, it blinks at normal speed. I don't believe this is that big
of a problem, because I assume the back right tailight is still blinking,
at what speed I don't know, but if someone has had this problem
or might know how to correct it, please let me know.
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Your wire to the right brake light is making contact with the blinker. Usually in a GM the wires will rub under the box and short out there. Check the plug-ins on the rear of the frame for corrosion first, that could be the problem. If everything is good there then you will have to unwrap the harness to the right side of the truck and start looking for bare spots or cracks in the insulation. Just tape them up and you'll beokay. Hope this helps.
Sounds to me like a bad ground. When the current can't complete through a ground circit it feeds back through the elements ancd can cause all sorts of wierd syptoms.
The fast blink itself can be casued by a burnt out bulb I would check that first.
Then I would check the trailter harness if there is one and unpluch any harness that may be plugged into it. also check each bulb to see if it is seated well. you may be able to see if there is corrorsionaround the bulb terminals at this time is so yo may need to replace the light assembly. Also you could look for any spot where maybe someone in the past tried to tie into the harness to hook up additional lights etc. this may allo moisture in and corroded to the point the wire is "open"
The blinker usually blinks fast when a turn signal light is burnt or not contacting. Check the signal bulbs to see if they are contacting or in good condition. If that is not it. Try replacing the blinker under the dash.
Usually that fast blink is a good warning that one of the signals is out. Double checked that bulb is same # and all that ? What number is on the bulb? if it's 2057 or 3057, try pulling wires on side of bulb with fingernail, outward to make better contact, to see if that helps.