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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

No vehicle power

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Old Jul 8, 2025 | 07:10 PM
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No vehicle power

1986 F150 302 EFI AOD 4x4 XLT Lariat.

No crank, no start. Interior and headlights work. Accessory key will power the radio. Turning the key lights dashboard and makes one (solenoid?) click and then everything shuts off. (No lights.)

Battery was load tested at AutoZone and is good.

Have recently replaced the fusible links from the starter solenoid. Have used a V200 breaker finder to test the fusible links and they all check out OK.

I connected a breakout box. It has a red LED that usually lights up to indicate vehicle power. The light doesn't turn on, and voltage testing the vehicle power slots shows zero volts. (I'm far from being an expert in using the breakout box.)

Any and all help is appreciated.
 
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Old Jul 8, 2025 | 07:50 PM
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Your large battery cables are bad. Loosen them and twist them back and forth on the battery posts, and then try it again.
 
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Old Jul 8, 2025 | 09:40 PM
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Problem solved. Thanks so much! (Twisting the battery cable didn't have an effect...in a moment of inspiration I ran a jumper cable from the battery to the starter solenoid and it started right up.)

Again, thanks!!!
 
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Old Jul 9, 2025 | 08:50 AM
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Originally Posted by Chasm*18
Problem solved. Thanks so much! (Twisting the battery cable didn't have an effect...in a moment of inspiration I ran a jumper cable from the battery to the starter solenoid and it started right up.)

Again, thanks!!!
Glad it was a easy fix. Now show us what your battery cables look like. Do they look like this ? The extra, small black and white wires are for my trailer brake kit.


 
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Old Jul 9, 2025 | 09:03 AM
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While we're on the topic of power, what does your Alt connections look like ? Have you upgraded the OEM 2G connectors to new improved ones ? The newer 2G Alt, comes with an integrated power connector, and you can splice in a new Voltage Regulator connector.



 
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Old Jul 23, 2025 | 10:03 AM
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I wanted to follow up and express my sincere gratitude for y'all's help. My truck is running great.



I also wanted to mention that I noticed something that someone else may encounter. That middle connection for the negative cable. I threaded the screw thru it at first to make it easier to get into the hole, but when I tightened it down it bottomed out on the cable side but was not solidly connected to the ground/truck. I backed the screw almost all the way out and retightened it and the connection was much stronger. I've replaced that negative cable before, and can't swear that I tightened it down as securely as it is now.

I have replaced the alternator connector in the past, but didn't do that same upgrade. That will have to go on the "future projects" list, as I've got a few other things more pressing at the moment.
 
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Old Jul 23, 2025 | 10:40 AM
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Glad to hear it's running well.
FWIW, I was also told by a member on here to spray the connections with something like ACF-50




 
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