7 Pin light plug ?
Postmaster
Joined: Nov 2003
Posts: 3,595
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From: Utah County, UT
250SD, can you send the picture to me via email? the larger the file the better, I can't read any of the lines on the picture you posted.
Mike
Mike
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Postmaster
Joined: Nov 2003
Posts: 3,595
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From: Utah County, UT
The schematic doesn't say what relay it is under the hood, but they are a common ground relay, all you would have to do is add a switch to supply 12V to the relay to trip it. I will look tomorrow, but I think, when standing by the driver side tire facing fuse box, there is another small relay box directly above it. I think it is the Left relay, and the right side relay is the battery charge. Quick way to check would be to turn key to on, pull both relays, you should be able to feel the battery charge relay clicking. the other of course would be the backup relay. Good luck, let us know if you have more questions.
Mike
Mike
Freshman User
Joined: Sep 2003
Posts: 46
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From: DE
No problem... 
I have yet to do this cangim, but I just ran out to the garage and yanked each relay one by one, and the power remained on using a testlight, testing both Pos, and back up contacts on the plug.....
Heres a pic showing the relays, three in the back, two in the front.
Would I still have power even though I pulled each relay individually?
I have yet to do this cangim, but I just ran out to the garage and yanked each relay one by one, and the power remained on using a testlight, testing both Pos, and back up contacts on the plug.....
Heres a pic showing the relays, three in the back, two in the front.
Would I still have power even though I pulled each relay individually?
Postmaster
Joined: Nov 2003
Posts: 3,595
Likes: 0
From: Utah County, UT
Yes one side of the relay should always have power, it will be the fused link coming in to the relay. Think that answers your question. Try this, in the fuse panel, mine is fuse 4 - TRAILER TOW BACKUP LAMPS / TRAILER TOW PARK LAMPS. Remove the Relay's, on the relay it should indicate what pins are for the coil and what ones are for the contacts. There will be one pin for the contacts that is common. That is the one that the power from the fuse panel comes in. All five should have power on the common pin, remove fuse 4 (or which ever fuse indicates the trailer tow backup lamps) then check all five again. One of the five should no longer have power. My truck is a pre 99, don't know if the fuse panel layout changed or not. At any rate, the manual should tell you what fuse it is.
