Need Help!! Backup Lights!!!!!!
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Junior User
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Need Help!! Backup Lights!!!!!!
79 F250 460 C6 auto
I cant seem to get the backup lights to work...
Good bulbs....Fuses are good....
the neutral safety switch was good ..replaced anyway....
What else can their be to check...
dont see anything in the column as far as switches???
I cant seem to get the backup lights to work...
Good bulbs....Fuses are good....
the neutral safety switch was good ..replaced anyway....
What else can their be to check...
dont see anything in the column as far as switches???
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Originally Posted by One79one71
It could also be the switch mounted at your shifter linkage...Had to rebuild mine once- Ford didnt believe in dielectric grease back them it seems.
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one problem i had dennis is someone replaced the NSS at one time and hard wired it in....and I had a aftermarket one that I put in so no colors matched.....
It doesnt start in anything but P and N with it right now....but no lights...
It doesnt start in anything but P and N with it right now....but no lights...
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That's a normal situation for these trucks.
That's why I suggested putting 12 volt jumper wire to the BU light wire to see if the BU lights come one that way..(bypassing the switch)
Remember this switch just goes to a certain position to close the circuit (allow power to continue along) to light up the lights.
They also have to have a good ground.
Something that deteriorates over time.
Sounds like it is time for some IN-depth inspection.
That's why I suggested putting 12 volt jumper wire to the BU light wire to see if the BU lights come one that way..(bypassing the switch)
Remember this switch just goes to a certain position to close the circuit (allow power to continue along) to light up the lights.
They also have to have a good ground.
Something that deteriorates over time.
Sounds like it is time for some IN-depth inspection.
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you got a wire diagram I can look at to see which wire gets the 12 volts....
Also in your picture where the connector is just above it in the main harness to the left not the right to firewall...there is a black wire not connected to anything....
Also in your picture where the connector is just above it in the main harness to the left not the right to firewall...there is a black wire not connected to anything....
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for the wires
the truck harness has
White/black/red/red
the NSS wires
Black/purple/Red/Red
The white/black and black/prurple are the only two to let truck start.....
the black wire on truck lets the backup lights come on with 12V
the most voltage I find while truck running is 0.5V
this truck has emissions missing so I have a white wire also from harness/black one/ and a light blue....
the light blue comes from firewall
the white one has some voltage on it
the black dont know...
the truck harness has
White/black/red/red
the NSS wires
Black/purple/Red/Red
The white/black and black/prurple are the only two to let truck start.....
the black wire on truck lets the backup lights come on with 12V
the most voltage I find while truck running is 0.5V
this truck has emissions missing so I have a white wire also from harness/black one/ and a light blue....
the light blue comes from firewall
the white one has some voltage on it
the black dont know...
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Originally Posted by 79f250460
Also in your picture where the connector is just above it in the main harness to the left not the right to firewall...there is a black wire not connected to anything....
Last edited by Mil1ion; Dec 23, 2007 at 06:12 PM.
