1977 F 150 electrical problem
Thread Starter
|
3rd Gear
Joined: Aug 2022
Posts: 3
Likes: 0
1977 F 150 electrical problem
Hey, I have a 1977 f150, and I’ve been having problems with it holding power, once the truck sits for a while it will turn over and start and run perfectly fine, once I turn the truck off and go to turn it over again within 10 minutes the truck won’t turn over but the heater works. I’ve replaced the battery alternator and starter this past month so I’m stuck! Anyone have any suggestions?
Desk Jockey
Joined: Sep 2021
Posts: 1,068
Likes: 425
From: Raleigh, NC
When it won’t turn over, can you describe what it is doing? Starter not turning over? Starter turning but no run/idle? I’ve heard similar issues related to the ICM but am guessing without more details.
Hotshot
Joined: Feb 2004
Posts: 10,808
Likes: 2,604
From: The Shenandoah Valley
Hey, I have a 1977 f150, and I’ve been having problems with it holding power, once the truck sits for a while it will turn over and start and run perfectly fine, once I turn the truck off and go to turn it over again within 10 minutes the truck won’t turn over but the heater works. I’ve replaced the battery alternator and starter this past month so I’m stuck! Anyone have any suggestions?
I've done it with a big pair of pliars, but safer way I think is take a jumper cable and clip one clip to the post nearest the starter, then with firm hand for good control, clip the other to the post nearest the battery, or use two .... one clipped to starter side solenoid post, one clipped to the battery pos post, and then stand a few feet away from the battery and touch the other two ends firmly together.
Desk Jockey
Joined: Sep 2021
Posts: 1,068
Likes: 425
From: Raleigh, NC
Agreed. Does it start once cooled down? Or is it intermittent? Could be a battery, battery cable, relay, starter cable or fuseable link. Consider taking a few of these off the list by:
Verifying battery has 12V
Checking battery connections., both pos and gnd
Checking starter relay connections, battery to relay, relay to starter
Squeeze test your fusable link on the relay side of the notch. Soft? If so might be bad.
Verifying battery has 12V
Checking battery connections., both pos and gnd
Checking starter relay connections, battery to relay, relay to starter
Squeeze test your fusable link on the relay side of the notch. Soft? If so might be bad.
5th Wheeling
Joined: Jun 2022
Posts: 30
Likes: 5
You mentioned that you recently replaced the alternator. If so, you may want to double check the connections to the voltage regulator. I had a similar problem in that the truck would start and run but after a few start/stop cycles, the battery would drop enough that the electrical accessories would work but it would not turn over. I replaced the voltage regulator but the PO had done a lot of "repairs" to the wiring so I missed one wire. It turns out that wire is responsible for routing power from the alternator to the battery for charging. I can't remember exactly which wire it was but I thought I would mention the voltage regulator in case the other suggestions do not address the problem. I ended up replacing the starter solenoid and the voltage regulator just to make sure everything was new. It was a cheap repair.
Thread
Thread Starter
Forum
Replies
Last Post
SARDiverDan
1999 - 2003 7.3L Power Stroke Diesel
7
Jul 20, 2017 10:44 PM
slntnddly
Electrical Systems/Wiring
1
Jan 25, 2004 01:18 PM
