Mechanics

FORD F-150 STARTER PROBLEM

1991 Ford F-150 • 85,000 miles

My starter keeps on cranking even after i've switched off the keys. I've replaced the relay on the fender the commutator on the coulm & the starter itself ! I'm stumped guys.
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Guest
November 29, 2012.




WE HAVE "S" AND "I" TERMINAL ON THERE

http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_starter-solenoid-bwd_5972833-p?searchTerm=starter

"S" WIRE---SHOULD MAKE IT'S WAY BACK TO THE KEY (IGN SWITCH)

YOU MAY OR MAY NOT HAVE A "I" WIRE----IT HELPS OUT THE COIL, WHILE CRANKING

REMOVE BOTH "S" AND "I" WIRES

THE TRUCK SHOULD NOT CRANK NOWIF THE RELAY WAS STUCK (NOW) IT WOULD TURN OVER CONSTANTLY, WITH THE BATTERY CABLES STILL CONNECTED

WE'RE GOING TO GO WITH----IT'S NOT GONNA START----FOR THIS TEST

WITH A VOLTMETER (OR TEST LIGHT) GROUND THE BLACK LEAD TO THE NEG BATTERY TERMINAL

CHECK "S" AND "I" WIRES FOR JUICE---BOTH SHOULD BE DEAD

HAVE YOUR PAL TURN THE IGN SWITCH TO "START" (NOT "ON")"S" SHOULD GET 12 VOLTS---RELEASE KEY---IT SHOULD DIE

DO IT SEVERAL TIMES---"S" SHOULD ONLY BE HOT----IN THE "START POSITION"

NOWIF YOU HAD THE WIRES CONFUSED----NOW YOU KNOW WHICH ONE IS "S" AND PUT IT ON "S" TERMINAL ON THE STARTER RELAY!!!

----IF "S" WAS ALWAYS HOT, YOU HAVE SOME TRACING TO DO!

I'M GONNA SHOW YOU HOW MY '77 JEEP CJ 5 WORKS----AMERICAN MOTORS CORPORATION (AMC) USED A FORD SYSTEM IN "REAL VEHICLES!

THIS, BY NO MEANS, IS HOW YOURS IS EXACTLY WIREDBUT A LOT OF YOURS IS SIMILARPAY ATTENTION TO HOW "S" AND "I" WORK

IF "S" WIRE OR "S TERMINAL" SOMEHOW GOT CROSSED UP WITH A CONSTANTLY HOT WIRE, "S" WOULD ACTIVATE THE RELAY ALL OF THE TIMETHIS COULD ALSO BE A DEFECTIVE IGNITION SWITCH

LET ME KNOW HOW IT GOES

THE MEDIC



CJ MEDEVAC
Nov 30, 2012.


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