The right front and right rear turn signal lights come on whenever the brakes are applied on my 1996 mazda b series truck. I have checked all the bulbs on that side, traced wires as far as I can. Removed the turn signal switch from the column and still have the same problem. It does this about 98% of the time. Mazda dealer was no help.
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The high mount brake light gets its own signal from the brake light switch (on the brake pedal). Or at least the wire leaving the brake light switch will splice, one wire to the high mount brake light, and the other for the rear brake lights is routed through the turn signal switch, and coordinated there with the turn signal wires to the rear brake lights. The brake wires and turn signal wires share the same wire, and same filament in the bulbs. It is kind of complicated, but brakes applied with no turn signal, brake light wire goes from brake light switch through the turn switch and out to the bulbs. If brakes applied with turning signal, non blinking brake light wire goes from turn switch to rear light, while the turning signal wire will go through the flasher relay, and then to the rear light to cause blinking.
I hope that makes sense. It appears the problem may be in the turn signal switch for both the turn signals and the rear brake lights.
check that all your bulbs are correct and are making contact. this commonly happens when a wrong bulb is installed in a socket. the other reason this happens is a bad ground, and one bulb uses another as a ground path. I would start at the rear left light and check that everything is good there, then move on to the front. 99 percent of these kinds of problems are at the lights themselves.
The bulb for the turn signal/brake light is a double filament bulb. It will come on with the lights on, but should light the second filament, making it brighter, with the brakes applied or turn signal on. It could just be a bad bulb, but one common problem on these years of truck is the rear light circuit board and requires the whole assembly to be replaced. Start by checking the bulb first though.
Hope this helps. Good luck!
Sound's like their is a problem with the right hand rear light cluster.The reason it only happen's going down a hill is you applying the brake. The only place the brake and indicator light's come together is the rear clusted. To check this apply the hand brake gently with the button held in instead of useing the foot brake. This may not be the fault but it is worth a try as it seems the most likely problem.
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"
I would Get in the Back pull up anything covering the Wiring harness for those lights and Look for A Corroded Connecter AND the GROUNDS on all thats why urn comes on while you Brake Electricity Finds the Easyest PATH to GROUND AND IF IT IS THROUGH THE Turn Sygnal switch GROUND is your FIRST PRIORITY here Trust me I'm ASE Certified in Electrical Systems
Grounds FIRST Please Dont forget to RATE me Thank You !