Solved 01 Montero Sport 4X4 Bat Brake Light On When Turning On Ac Mitsubishi
Chosen Solution When turning on ac, battery and brake light comes on then has electrical power surges. Hi, The warning lights indicate that there is a problem with the alternator output. With the engine running, use a DMM (Digital MultiMeter - Voltmeter function) to check the voltage appearing across the battery terminals. It should be roughly between 13.8 - 14.3V DC. If it is not, before you consider replacing the alternator, turn OFF the engine and then check that there is no oil leaking onto the alternator....