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Alternators
Ford Explorer

How do you change a 3 wire gm alternator to a one wire?

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2011-09-12 09:32:14

ALL ALTERNATORS NEED TO BE "FLASHED" TO PRODUCE POWER. BIG TRUCK

ALTERNATORS ARE BUILT WITH AUTOMATIC FLASHING, SO YOU NEED TO ONLY

CONNECT THE OUTPUT STUD TO THE BATTERY. SMALL AUTO ALTERNATORS,

USUALLY HAVE TO BE FLASHED EXTERNALY. THAT IS, POWER MUST BE

APPLIED MOMENTARILY TO START THEM CHARGING. ON DELCO UNITS, THERE

ARE TWO SMALL TERMINALS ON THE TOP. ONE IS A FEEDBACK THAT CONTROLS

THE REGULATOR. IT SHOULD BE CONNECTED TO THE BATTERY, BUT IT IS

COMMON TO JUST HOOK IT TO THE OUTPUT STUD. THE OTHER ONE IS THE

FLASH TERMINAL. HOOK IT TO THE IGNITION. THE CATCH IS THAT THIS

TERMINAL PRODUCES POWER, AND THE ENGINE WILL CONTINUE TO RUN WHEN

THE KEY IS TURNED OFF. YOU CAN STOP THIS BY PUTTING A DIODE IN THE

CIRCUIT. REMEMBER THAT A DIODE IS A ONE WAY DEVICE, AND IF IT

DOESNT WORK, TURN IT AROUND. THE FLASH TERMINAL MUST BE BELOW

OUTPUT VOLTAGE, OR THE REGULATOR WILL NOT WORK. ABOUT 4.5 VOLTS IS

REQUIRED, AND A 8 OHM RESISTOR IN SERIES WITH THE DIODE IS

REQUIRED. A AUTOMOTIVE LIGHT BULB IS IN THE 6 TO 8 OHM RANGE, AND

WORKS FINE. THIS IS WHY CARS HAVE IDIOT LITES FOR THE ALTERNATOR.

ITS CHEAPER THAN HAVING AN IGNITION SWITCH WITH TWO ING. TEMINALS.

EARLY CARS DIDN'T. AND FEEDBACK THRU THE IDIOT LITE KEPT THE

IGNITION POWERED JUST ENOUGH TO KEEP THE ENGINE STUMBLING ALONG FOR

SEVERAL SECONDS. HOPE THIS HELPS.


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