HELP!!!!electrical problems in the '75
Thread Starter
|
Senior User
Joined: Nov 2005
Posts: 176
Likes: 0
HELP!!!!electrical problems in the '75
Help!!!!! I have a 1975 F-250 4x4 highboy with a 390/C6 combo. It's a great truck as long as it starts. That is where the problem lies. Somebody accidently reversed the polarity when they were changing out the battery (seriously, it wasn't me!). And now the truck does NOTHING!!! I changed out the selenoid, relay, and installed a new battery and it still does nothing. Do I still need to change out the voltage regulator? This truck also contains a lot of Camper/Trailer Special parts but the truck does not have the aux. battery at all. I hope there is nothing seriously FUBAR with the electrical. Any help would be great. Thanks!
Matt
Matt
Postmaster
Joined: Jul 2005
Posts: 3,248
Likes: 0
Check the fusible links from the starter relay (aka starter solenoid) to the alternator, Some times they will burn out when the battery cables are crossed polarity. Peel back the electrical tape with a sharp razor just grazing the tape. Inspect the fusible links and the solder connection.
Here a link on fusible link https://www.ford-trucks.com/user_gal...=94670&width=0
https://www.ford-trucks.com/user_gal...=94673&width=0
https://www.ford-trucks.com/user_gal...=94674&width=0
https://www.ford-trucks.com/user_gal...=94672&width=0
_____________
-buck-
1976 F150 4x4
1975 F150 4x4
1975 F250 4x4
1978 F150 4x2
Here a link on fusible link https://www.ford-trucks.com/user_gal...=94670&width=0
https://www.ford-trucks.com/user_gal...=94673&width=0
https://www.ford-trucks.com/user_gal...=94674&width=0
https://www.ford-trucks.com/user_gal...=94672&width=0
_____________
-buck-
1976 F150 4x4
1975 F150 4x4
1975 F250 4x4
1978 F150 4x2
Postmaster
Joined: Jul 2005
Posts: 3,248
Likes: 0
Also check for any burnt or frayed electrical wires around the battery, alternator, voltage regulator and starter solenoid. Solder all new electrical wires, do not use the crimp on connector, they will corrode and come loose over time.
buck
buck
New User
Joined: Jan 2008
Posts: 0
Likes: 24
I also suspect the fusible links in the main harness to the cab as well.
From the starter SOLENOID or relay ,trace the wiring harness wrapped in tape to just behind the engine head.
In there are the fusible links that power the fuse box and circuitry.
I suspect the reverse polarity melted them clean through.
From the starter SOLENOID or relay ,trace the wiring harness wrapped in tape to just behind the engine head.
In there are the fusible links that power the fuse box and circuitry.
I suspect the reverse polarity melted them clean through.
Thread
Thread Starter
Forum
Replies
Last Post
Andershoberg
Excursion - King of SUVs
2
Aug 11, 2014 02:26 PM
jjw4413
1999 - 2016 Super Duty
2
Apr 6, 2012 09:43 AM
conrad55
1948 - 1956 F1, F100 & Larger F-Series Trucks
19
Jul 18, 2009 02:58 AM
Matt
1973 - 1979 F-100 & Larger F-Series Trucks
3
Jul 13, 1999 07:30 AM
