Mechanics

F150 WONT START

1978 Ford F-150

Electrical problem
1978 Ford F150 V8 Two Wheel Drive Automatic

i am working on my sister inlaws truck. I put a new starter sylinoid in and a new battery. When you turn the key the warning lights come on but it does nothing else. Dosent turn over or nothin. Yesterday I took a thick gage wire and bypassed the sylinoid and it started but today it is not doing nothing even when I bypass the sylinoid. It had an alarm system in it but was a mess of a job, I took the alarm out but it still wont start. What do I do?
Avatar
Jhaddock
April 3, 2010.




See my profile. This may help you understand the "SYSTEM", and What does What.

Short of a bad STARTER OR BAD SOLENOID, your problem is probably in this:

Yours may not look exactly like this.

TAKE STUFF LOOSECLEANTIGHTEN WELL

DO NOT JUST PASS IT OFF AS, "IT LOOKS GOOD"

CLEAN and TIGHTEN NEGATIVE GROUND TO ENGINE (and engine)

INSURE, You have a HEAVY JUMPER (GROUND) from engine to frame (usually found at motor mounts)

Last, but not least, a ground to the BODY

Do not leave off where the Battery cables connect to the Battery clamps! (not the posts) Do them too!

While you are at it, ----Both ends of Pos cable----AND----Both ends of NEG cable.----

If you still have the problem, you're probably looking at $20 to replace the SOLENOID. Follow Battery Positive cable to find it.

My stuff may be OVERKILL, but at least you will know what everything is and does.

Like my newly made "NELSOMATIC" stuff? I am cyber stupid, and did that! Keeps me from hunt and pecking so much!

Please Reply, Good or Bad.

I will continue to try to help you through your whole ordeal, even if this didn't help you. Just continue to Reply at "reply to question".

Love, Turddog


http://www.2carpros.com/forum/automotive_pictures/411289_A_B_C_D_EXPLANATION_2.jpg



http://www.2carpros.com/forum/automotive_pictures/411289_A_B_C_D_17_LOCATIONS_2.jpg



"FORD TYPE" SOLINOID SYSTEM, YOUR ACCES., MAY VARY

1) POSITIVE CABLE FROM BATTERY

2) OUT TO STARTER MOTOR

3) ON MY JEEP, THIS GOES TO THE ALTERNATOR

4) THIS FEEDS MY FUSEBOX (ALL OF MY ACCESSORIES)

5) "S" WIRE IS FROM KEY, 12V ONLY WHILE YOU ARE "CRANKING"

THIS WIRE ACTIVATES THE SOLINOID'S ELECTROMAGNET, WHICH IN TURN, CONNECTS---A & B INTERNALLY (ONLY THE 2 LARGE GAUGE CABLES CAN HANDLE THE AMPERAGE THE STARTER "PULLS").

WHEN THE SOLINOID IS ACTIVATED, IT THROWS 12V TO STARTER USING THE LARGE GAUGE CABLES (1) POS FROM BATT--THRU SOLINOID INTERNAL CONNECTION--(2) TO THE STARTER, WHILE KEY IS IN "CRANKING" MODE.

THIS IS THE TOTAL REASON FOR A SOLINOID, BECAUSE IT WOULD NOT BE PRACTICAL, TO RUN THE HEAVY CABLES TO AND FROM YOUR KEY SWITCH.

6) "I" WIRE (OPTIONAL), FEEDS COIL "FULL 12V", ONLY WHILE "CRANKING", AFTER YOU RELEASE THE KEY, THE COIL REVERTS BACK TO REDUCED VOLTAGE, SUPPLIED BY YOUR KEY IN THE "RUN" POSITION.

7) "MOUNT" GROUND, UNIT MUST HAVE A GOOD GROUND (BATT. TO ENGINE, ENGINE TO FRAME, FRAME TO BODY [ALL MUST CONNECT, SOMEHOW] )

(3 & 4, ON MY JEEP) ARE FUSABLE LINKS, ALL ARE NOT MARKED, MY #3 IS, #4 IS NOT....ITS SORT OF A "WIRE" FUSE.

IF THEY ARE GOOD, TUGGING ON THEM WILL BE JUST LIKE A WIRE, WHEN THEY ARE "BURNED UP", THEY WILL STRETCH OUT LKE A RUBBER BAND.

JUST A LITTLE "SMILE" FROM MR. JEEP!


http://www.2carpros.com/forum/automotive_pictures/411289_100_0327_1.jpg



AND A CONCERNED LOOK FROM WILLY.


http://www.2carpros.com/forum/automotive_pictures/411289_GOOD_OLE_WILLY_1.jpg


CJ MEDEVAC
Apr 3, 2010.


AD