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GET A GOOD FUSE TESTER, TEST ALL THE FUSES. THERE IS A FUSE BOX UNDER THE DASH, CHECK EACH FUSE TURN ON HEADLIGHT SWITCH, THE FUSES CAN BE TESTED WHILE STILL IN THE FUSEBOX. POWER ON ONE SIDE, FUSE IS BAD. POWER ON BOTH SIDES, FUSE IS GOOD. POWER ON NEITHER SIDE, SPARE FUSE. IF THERE IS NO POWER AT THE TAIL LIGHT FUSE, THE HEADLIGHT SWITCH MAY BE BAD. IF THE FUSES ARE THE OLDER GLASS BARREL TYPE THEY MAY HAVE BECOME CORRODED OR RUSTY. IF SO YOU WILL NEED TO CLEAN THE FUSE BOX CONTACTS WITH FINE GRIT SANDPAPER & PUT IN A NEW FUSE.
Had the exact problem on my 98 ranger 2wd reg cab stepside with the 2.5l 4 banger. Anytime I pressed the brake my passenger side turn signal would light up solid on the dash and the lights outside. I pulled both rear lights and both headlights and turn signals to check for corrosion/loose wires. Nothing. I checked and cleaned all my grounds and fuses. Nothing. Not until I followed my rear taillights wire harness did I find the problem. The two taillights are connected to each other via wire harness. My truck had the harness split with an adapter for trailer brakes. This harness was the problem. It is located under the rear bumper by the spare tire. Simply disconnect two harness plugs going into each side and remove it. Then connect the two plugs to each other. Problem solved.
THE SOLUTION WAS THE HEADLIGHT SWITCH. IT TURNS OUT THIS IS A COMMON PROBLEM ON THIS PARTICULAR MODEL. THE BROWN WIRE USUALLY BURNS UP. CHECK ALL WIRES AND CONTACTS BEHIND HEADLIGHT SWITCH. TO PULL SWITCH, THERE IS A RELEASE BUTTON ON THE BACK SIDE OF THE SWITCH. PRESS THAT BUTTON AND IT WILL REALES THE PLUNGER. PULL THE PLUNGER ALL THE WAY OUT AND YOU WILL BE ABLE TO PULL THE HEADLIGHT SWICH OUT. i JUST REPAIRED BROWN WIRE AND CLEANED CONTACT. VOILA.. RUNNING LIGHTS ARE NOW ON. THAT RELEASE BUTTON ON THE SWITCH IS A BOOG TO GET TO THO. GOOD LUCK