Trailer harness running lights.
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Freshman User
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Trailer harness running lights.
Hey folks, I've got a 2000 F250 with the tow package. I'm having an issue with the trailer harness running lights. It's not the trailer, works fine on another truck. As far as i can figure, the orange wire from the truck wiring harness powers the running lights. I've go no voltage on that wire, all the fuses are good, everything else works on the harness and the truck. Can anyone point me at the next logical test/failure point? I'm assuming at this point its a broken wire, but I'm not great with vehicle electronics.
TIA!
TIA!
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
Fuse F4, which supplies power to the relay, is in the underhood relay/fuse box.
The trailer running lamp relay is in the under dash box, not under the hood.
The wire from the relay, all the way to the rear trailer connector, is brown/white.
It is not uncommon for the connections under the body (along the left frame rail) to develop corrosion in one or more pins. It would be worthwhile to, after verifying F4 and the relay as properly operating, to crawl under there and check each of those connectors by unplugging each and inspecting them.
The trailer running lamp relay is in the under dash box, not under the hood.
The wire from the relay, all the way to the rear trailer connector, is brown/white.
It is not uncommon for the connections under the body (along the left frame rail) to develop corrosion in one or more pins. It would be worthwhile to, after verifying F4 and the relay as properly operating, to crawl under there and check each of those connectors by unplugging each and inspecting them.
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Joined: Jan 2001
Posts: 56,983
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From: Virginia
Fuse F4, which supplies power to the relay, is in the underhood relay/fuse box.
The trailer running lamp relay is in the under dash box, not under the hood.
The wire from the relay, all the way to the rear trailer connector, is brown/white.
It is not uncommon for the connections under the body (along the left frame rail) to develop corrosion in one or more pins. It would be worthwhile to, after verifying F4 and the relay as properly operating, to crawl under there and check each of those connectors by unplugging each and inspecting them.
The trailer running lamp relay is in the under dash box, not under the hood.
The wire from the relay, all the way to the rear trailer connector, is brown/white.
It is not uncommon for the connections under the body (along the left frame rail) to develop corrosion in one or more pins. It would be worthwhile to, after verifying F4 and the relay as properly operating, to crawl under there and check each of those connectors by unplugging each and inspecting them.
http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=69101
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
I have seen mistakes before in these things, even the Ford diagrams.
Let me do a couple of cross-checks, either the diagram I have or the one you have is incorrect, they both cannot be correct.
Fleet Owner
Joined: Apr 2008
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From: 0,0,1
According to page 3 of the diagram, both fuse 4 and the relay are in the battery junction box.
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Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
Use this one for the pickup: http://revbase.com/BBBMotor/Wd/DownloadPdf?id=69129
The relay is in the "IP Relay Block" which also holds the flasher relay. See following thread for the same discussion (and problem).
https://www.ford-trucks.com/forums/1...t-working.html
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Joined: Jan 2001
Posts: 56,983
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From: Virginia
Yes, it does, but it also appears to be the diagram for the Excursion, not the F250. They're not identical.
Use this one for the pickup: http://revbase.com/BBBMotor/Wd/DownloadPdf?id=69129
The relay is in the "IP Relay Block" which also holds the flasher relay. See following thread for the same discussion (and problem).
https://www.ford-trucks.com/forums/1...t-working.html
Use this one for the pickup: http://revbase.com/BBBMotor/Wd/DownloadPdf?id=69129
The relay is in the "IP Relay Block" which also holds the flasher relay. See following thread for the same discussion (and problem).
https://www.ford-trucks.com/forums/1...t-working.html
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