Electrial Gremlins
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Fleet Owner
Joined: Dec 2000
Posts: 25,406
Likes: 5,416
From: Central PA
Electrial Gremlins
I have a slight problem with the marker lights and tail lights on my new 1970 F350.
When the headlights or parking lights are on the tail lights are not on. The brake lights work. The rear turn signals do not come on when the lights are on. The fronts turn signals work. The rear turnsignals work when the lights are off. The clearance lights on the side of the bed do not work at all.
Yesterday all the lights worked. It was tonight and dark outwhen I discovered this so I didn't mess around with it a whole lot.
My guess is a ground or a loose wire...
Any help will be appreciated.
When the headlights or parking lights are on the tail lights are not on. The brake lights work. The rear turn signals do not come on when the lights are on. The fronts turn signals work. The rear turnsignals work when the lights are off. The clearance lights on the side of the bed do not work at all.
Yesterday all the lights worked. It was tonight and dark outwhen I discovered this so I didn't mess around with it a whole lot.
My guess is a ground or a loose wire...
Any help will be appreciated.
See A Man About A Horse
Joined: Apr 2003
Posts: 4,936
Likes: 699
From: Mariposa, Ca.
I have a slight problem with the marker lights and tail lights on my new 1970 F350.
When the headlights or parking lights are on the tail lights are not on. The brake lights work. The rear turn signals do not come on when the lights are on. The fronts turn signals work. The rear turnsignals work when the lights are off. The clearance lights on the side of the bed do not work at all.
Yesterday all the lights worked. It was tonight and dark outwhen I discovered this so I didn't mess around with it a whole lot.
My guess is a ground or a loose wire...
Any help will be appreciated.
When the headlights or parking lights are on the tail lights are not on. The brake lights work. The rear turn signals do not come on when the lights are on. The fronts turn signals work. The rear turnsignals work when the lights are off. The clearance lights on the side of the bed do not work at all.
Yesterday all the lights worked. It was tonight and dark outwhen I discovered this so I didn't mess around with it a whole lot.
My guess is a ground or a loose wire...
Any help will be appreciated.
Senior User
Joined: Jan 2004
Posts: 298
Likes: 0
From: Albany NY
The seals in the hoist cylinder and grease in the hinges might be insulating the bed from the chassis ground. Try running a 12 ga ground wire with good clean connections between the bed and truck frame.
Thread Starter
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Fleet Owner
Joined: Dec 2000
Posts: 25,406
Likes: 5,416
From: Central PA
I have a slight problem with the marker lights and tail lights on my new 1970 F350.
When the headlights or parking lights are on the tail lights are not on. The brake lights work. The rear turn signals do not come on when the lights are on. The fronts turn signals work. The rear turnsignals work when the lights are off. The clearance lights on the side of the bed do not work at all.
Yesterday all the lights worked. It was tonight and dark outwhen I discovered this so I didn't mess around with it a whole lot.
My guess is a ground or a loose wire...
Any help will be appreciated.
When the headlights or parking lights are on the tail lights are not on. The brake lights work. The rear turn signals do not come on when the lights are on. The fronts turn signals work. The rear turnsignals work when the lights are off. The clearance lights on the side of the bed do not work at all.
Yesterday all the lights worked. It was tonight and dark outwhen I discovered this so I didn't mess around with it a whole lot.
My guess is a ground or a loose wire...
Any help will be appreciated.
So I must have gotten something wet when I washed the cab or the gremlins were there and left today sometime...
Thoughts... advice?
Logistics Pro
Joined: Nov 2011
Posts: 4,685
Likes: 81
From: Northville, MI
I have a slight problem with the marker lights and tail lights on my new 1970 F350.
When the headlights or parking lights are on the tail lights are not on. The brake lights work. The rear turn signals do not come on when the lights are on. The fronts turn signals work. The rear turnsignals work when the lights are off. The clearance lights on the side of the bed do not work at all.
Yesterday all the lights worked. It was tonight and dark outwhen I discovered this so I didn't mess around with it a whole lot.
My guess is a ground or a loose wire...
Any help will be appreciated.
When the headlights or parking lights are on the tail lights are not on. The brake lights work. The rear turn signals do not come on when the lights are on. The fronts turn signals work. The rear turnsignals work when the lights are off. The clearance lights on the side of the bed do not work at all.
Yesterday all the lights worked. It was tonight and dark outwhen I discovered this so I didn't mess around with it a whole lot.
My guess is a ground or a loose wire...
Any help will be appreciated.
Failing that you might want to check with the guys on the '67-'72 forum.
Posting Guru
Joined: Sep 2012
Posts: 1,314
Likes: 1
Thanks.
I'm an engineer by trade. Intermittent problems can be a beast to troubleshoot.
Thread Starter
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Fleet Owner
Joined: Dec 2000
Posts: 25,406
Likes: 5,416
From: Central PA
I went out tonight... turned on the lights.. they all worked including the bed marker lights... I turned on the ignition and all lights worked.. I put on the turnsignals and they worked, both with and without the lights on...
So I must have gotten something wet when I washed the cab or the gremlins were there and left today sometime...
Thoughts... advice?
So I must have gotten something wet when I washed the cab or the gremlins were there and left today sometime...
Thoughts... advice?
They should have a good ground. The PO run a ground wire back to the Neg terminal on the battery.
But here is a question, more out of curiosity: the clearance lights (on the roof)do not come on when I turn the parking lots or headlights on.They only come on when the ignition switch is on. Is this stock of did the PO wire them up that way?
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