Ford f100
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1st Gear
Joined: Dec 2024
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Ford f100
I’ve been having all kinds a electrical problems with my truck starting out my dash lights anit worked in almost a year now my brake lights went out I replaced the bulbs and soon as I hit a bump it goes back out should I change out the connector for it and how would I go about splicing it together thanks any help I could get would be appreciated
Lead Driver
Joined: Jun 2013
Posts: 5,691
Likes: 1,174
From: Tolland, CT
Welcome to the Forum. You might find this link helpful, we all use that.
https://www.garysgaragemahal.com/1980-evtm.html
I assume your truck is a 1980, what engine is in it ?
I assume you have made sure all the electrical connections are corrosion free ?
I find my local NAPA can get most wire connectors, I'll assume other name brand auto parts stores can too. Most will tell you to buy local and don't buy the cheapest part you see.
https://www.garysgaragemahal.com/1980-evtm.html
I assume your truck is a 1980, what engine is in it ?
I assume you have made sure all the electrical connections are corrosion free ?
I find my local NAPA can get most wire connectors, I'll assume other name brand auto parts stores can too. Most will tell you to buy local and don't buy the cheapest part you see.
FTE Legend
Joined: Nov 2015
Posts: 30,983
Likes: 4,136
From: Angier, NC
Welcome to FTE
I would first start at the battery as that is where power for lights start.
Make sure the ground side is good. Battery> motor> to frame. You also need a 10 ga wire from the motor to the fire wall to ground the cab.
It also would not hurt to add a ground from bed to frame so it is grounded.
I would pull all the fuses and if they look bad replace. If you reuse them clean the metal part of the fuse before you put it back on the fuse box.
There is a plug under the brake booster that is from the main harness to the rear harness that runs along the frame. There is another plug at the left rear from the frame harness to the taillight harness.
Pull them apart, mainly the taillight plug, to make sure they are clean.
Being the brake lights are out I would look at the switch. Dose the switch have power in to it all the time and if the pedal pushed power out?
May want to recheck the taillight bulbs and sockets to make sure they are good.
You also say brake lights went out again do the turn signal lights work front / rear? What about 4 ways?
On the dash lights I bet they are burnt out and the colored caps frosted. What happens when you turn the head light switch left & right a few times anything?
I would replace all the bulbs and clean the socket contacts on the cluster and go from there.
Dave ----
I would first start at the battery as that is where power for lights start.
Make sure the ground side is good. Battery> motor> to frame. You also need a 10 ga wire from the motor to the fire wall to ground the cab.
It also would not hurt to add a ground from bed to frame so it is grounded.
I would pull all the fuses and if they look bad replace. If you reuse them clean the metal part of the fuse before you put it back on the fuse box.
There is a plug under the brake booster that is from the main harness to the rear harness that runs along the frame. There is another plug at the left rear from the frame harness to the taillight harness.
Pull them apart, mainly the taillight plug, to make sure they are clean.
Being the brake lights are out I would look at the switch. Dose the switch have power in to it all the time and if the pedal pushed power out?
May want to recheck the taillight bulbs and sockets to make sure they are good.
You also say brake lights went out again do the turn signal lights work front / rear? What about 4 ways?
On the dash lights I bet they are burnt out and the colored caps frosted. What happens when you turn the head light switch left & right a few times anything?
I would replace all the bulbs and clean the socket contacts on the cluster and go from there.
Dave ----
Tuned
Joined: Sep 2014
Posts: 472
Likes: 105
1980 there is a ground wire under a screw behînd the taillight housing on both sides.
then multiple ground wires are joined together half way in between, you will notice a lump in the harness.
tween.
This was an issue with mine and some crayz stuff would happen.
Then the dash light problem ended up being a ground wire between the intake manifold and the cab.
The taillight harness with a different way of grounding the taillights was changed on later year bullnose but I am not sure when.
then multiple ground wires are joined together half way in between, you will notice a lump in the harness.
tween.
This was an issue with mine and some crayz stuff would happen.
Then the dash light problem ended up being a ground wire between the intake manifold and the cab.
The taillight harness with a different way of grounding the taillights was changed on later year bullnose but I am not sure when.
Lead Driver
Joined: Jun 2013
Posts: 5,691
Likes: 1,174
From: Tolland, CT
I'm sure there must be a page in Gary's site in the EVTM that shows the ground wires.
Here's the 81's I couldn't load the 80. Oh, I see the EVTM for the 80 is a little different in the way its loaded.
https://www.garysgaragemahal.com/grounds.html
Here's the 81's I couldn't load the 80. Oh, I see the EVTM for the 80 is a little different in the way its loaded.
https://www.garysgaragemahal.com/grounds.html
FTE Legend
Joined: Nov 2015
Posts: 30,983
Likes: 4,136
From: Angier, NC
1980 there is a ground wire under a screw behînd the taillight housing on both sides.
then multiple ground wires are joined together half way in between, you will notice a lump in the harness.
tween.
This was an issue with mine and some crayz stuff would happen.
Then the dash light problem ended up being a ground wire between the intake manifold and the cab.
The taillight harness with a different way of grounding the taillights was changed on later year bullnose but I am not sure when.
then multiple ground wires are joined together half way in between, you will notice a lump in the harness.
tween.
This was an issue with mine and some crayz stuff would happen.
Then the dash light problem ended up being a ground wire between the intake manifold and the cab.
The taillight harness with a different way of grounding the taillights was changed on later year bullnose but I am not sure when.
This is why I said to run a ground wire from frame to the bed somewhere as the frame should be grounded from the factory.
Later year trucks had a ground wire from the tail lights to inside the cab behind the radio on the firewall and why the cab has to be grounded.
Also from motor to cab to ground the cab as the motor was factory grounded.
Dave ----
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