1987 Isuzu Trooper fuel, alternator, brake warning lights stay on
I have a 1987 Isuzu Trooper on which the fuel, alternator, and the brake warning lights remain lit when the engine is running. I have replaced the alternator and the battery, but the lights remain lit.
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The two WHT wires from 80A MAIN fuse FL-1 in the fuse/relay box connect to the B (battery) terminal. The BLK/YEL wire from 15A ENGINE fuse C-8 in the dash fuse box connects to the IG (ignition) terminal. The WHT/GRN wire from the charge warning light in the instrument panel connects to the L (light) terminal. Tre is no connection to the C terminal in the 1995 Isuzu Trooper
You say the alternator tested good, on the car or off ? There are two fuses from the alternator to the key switch, a 7.5 amp and a 15 amp. There is also an 80 amp fuse from the alternator to the battery. I would check these fuses and the connections at the alternator, plus the ground between the engine and the frame.
CHECK TO MAKE SURE WITH CAR RUNNING VOLTAGE AT THE BATTERY SHOULD BE 13.5 VOLTS TO 14.5 VOLTS. USE A DIGITAL VOLT METER TO CHECK VOLTS AT BATTERY. WITH ENGINE OFF BATTERY VOLTAGE SHOULD BE 12.5 VOLTS. IF NOT ALTERNATOR NOT CHARGING BATTERY.THAT WILL MAKE ABS AND BRAKE LIGHTS COME ON AND A FAULTY BRAKE LIGHT SWITCH WILL ALSO CAUSE ABS AND BRAKE LIGHTS COME ON.IF ALL LOOKS GOOD.HAVE THE ABS BRAKES SCANNED.IN THIS CASE YOU ARE HAVING BRAKE FAILURE.BECAUSE WHEN BRAKE LIGHT COMES ON THATS WARNING BRAKE FAILURE BECAUSE THE BRAKE MASTER CYLINDER AND ABS UNIT IS TOGETHER AS ONE.NOT SAFE TO DRIVE.COULD LOSE BRAKE CONTROL AT ANY TIME TOW IT IN.