An alternator will ground out when the normally insulated line that charges the battery( after going through the regulator system) makes contact with the alternator shell. This sends any voltage to the surrounding case and to any surrounding metal thusly grounding the voltage out. This can occur due to vibration or excessive moisture to the casing.
This might mean the ground is isolated from the case of the alternator. In a normal application, the case of the alternator is the ground connection and being bolted to the engine block via a metal bracket, the grounded case of the alternator is electrically connected to the ground lead of the battery which is also connected to the engine block. An isolated ground might indicate the alternator ground is electrically insulated from the alternator case.
There usually isn't one. The vehicle becomes the ground, and since the alternator is physically attached to the engine, the case of the alternator becomes the ground. Note that the battery is also connected to the vehicle chassis, usually at 2 or more points, and that the engine usually has a grounding strap to some solid point on the chassis.
my alternator recently went out on my 650 Triumph, a BSA friend told me to unhook the two wires from the alternator and with an ampmeter set to where it will sound the horn when you touch the two ampmeter leads together,now plug one of the ampmeter leads into the alternator lead and touch the other lead to ground, it should buzz if it is grounded. my alternator and rotor were burned and touching causing a ground.
To change the alternator in your 1986 Chevrolet Celebrity: 1, Remove the battery ground cable. 2. Unplug remove the wiring from the alternator. 3. Loosen the bolts that hold the alternator in place. Remove the drive belt. 4. Remove the bolts and the alternator will pull out. Reverse the process to reinstall the new alternator.
Fuse control the alternator is in engine compartment fuse box reads 100 amp and to find out alternator is good or bad disconnect your ground cable when SUV running .after disconnected and not running just kills motor down, alternator is bad .precaution do not let the ground touch the positive post cable will short your alternator needs to be replace...... hope this helps good luck Montero sports fans.
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