7 Pin wiring question
Cargo Master
Joined: Oct 2007
Posts: 2,712
Likes: 107
From: BoCoMo
I am almost 100% sure that the camper battery charger wire Is Not 'Hot' until the truck is running.
The 'running' lights will come on when you turn on the truck running lights (with or without the egn. on or at 'run').
But I don't think it is designed to 'charge' the camper battery unless the truck is also 'charging' the truck batteries. And that does not happened until the truck is running and the altenator is running. the truck batteries do not 'charge' it....the altenator does.
The 'running' lights will come on when you turn on the truck running lights (with or without the egn. on or at 'run').
But I don't think it is designed to 'charge' the camper battery unless the truck is also 'charging' the truck batteries. And that does not happened until the truck is running and the altenator is running. the truck batteries do not 'charge' it....the altenator does.
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Elder User
Joined: Aug 2009
Posts: 574
Likes: 0
From: Vader
I guess I am still stumped. I put everything back together, and all works, except of course my charging wire. I am puzzled at this # 39, as mentioned above, the list of fuses/relay's go from 1-40 but the fuse box only goes to # 37. I had the truck running and could not get any power from the wire that the charging wire from camper is spliced to.
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
Is the small relay "doghouse" that's shown to the left of the fuseblock in this photo present? (Disregard the blue tape and the word "here", it's for another project). A '99 with the trailer towing package should have a total of three of these little doghouses under the hood near the main fuse block.
That doghouse and wiring are added by the trailer towing package, and are where two of the missing numbered relays are. If you take off that cover, you'll likely find a relay missing.
My truck came without the trailer towing package, at least the electrical part, and I had to add that doghouse, relays, and wiring.
Pop
That doghouse and wiring are added by the trailer towing package, and are where two of the missing numbered relays are. If you take off that cover, you'll likely find a relay missing.
My truck came without the trailer towing package, at least the electrical part, and I had to add that doghouse, relays, and wiring.
Pop
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
Lead Driver
Joined: Jul 2003
Posts: 7,404
Likes: 52
From: Wheatland, Mo
I can take a pic of mine when I get home in about 3 hrs. I have an early 99 and all of my wires are in use. Power, back up brake etc. I can post it later on if you want to compare.
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Elder User
Joined: Aug 2009
Posts: 574
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From: Vader
Please do, then tomorrow after work I will look at mine and see if it matches. I just want to be able to check this before I go through the trouble of running a new wire from front to back.
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Elder User
Joined: Aug 2009
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From: Vader
Ok Pop, mine does look like that. In very front of the smaller three relays, there are two fuses, the left side (looking at front of truck) does not have a fuse in it, yours does. So now that we determined we match, is #39 relay one of those?
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
Here is a photo of the doghouses and fuse block with their covers removed, showing the relays and fuses.
Trailer battery charge relay and trailer back-up lights relay are contained in the doghouse in the left center.
ALSO, the missing "fuse" you don't have in Position 36 is the A/C Clutch Diode, so I'm guessing your truck doesn't have air conditioning.
It would be normal to not have anything plugged in that position if that is the case.
Pop
Trailer battery charge relay and trailer back-up lights relay are contained in the doghouse in the left center.
ALSO, the missing "fuse" you don't have in Position 36 is the A/C Clutch Diode, so I'm guessing your truck doesn't have air conditioning.
It would be normal to not have anything plugged in that position if that is the case.
Pop
Lead Driver
Joined: Jul 2003
Posts: 7,404
Likes: 52
From: Wheatland, Mo
Here is a photo of the doghouses and fuse block with their covers removed, showing the relays and fuses.
ALSO, the missing "fuse" you don't have in Position 36 is the A/C Clutch Diode, so I'm guessing your truck doesn't have air conditioning.
It would be normal to not have anything plugged in that position if that is the case.
Pop
ALSO, the missing "fuse" you don't have in Position 36 is the A/C Clutch Diode, so I'm guessing your truck doesn't have air conditioning.
It would be normal to not have anything plugged in that position if that is the case.
Pop
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
The relay nearest the firewall is for the trailer back-up lights, and the charge relay is the other one.
Both Fuse 16 and 24 must be good for the charging current to appear in your 7-pin connector. Of course, that relay must be present, too.
Pop
Both Fuse 16 and 24 must be good for the charging current to appear in your 7-pin connector. Of course, that relay must be present, too.
Pop