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I have a 79 F350 4x4. I am converting it from a 4 speed to a c6. There is a frying pan shaped plug coming out of the harness right ahead of the front fuel tank. Anybody know where it goes?. It appears to only have
one terminal in it
Also check your proportioning valve for the brakes. There a switch on that too that turns on brake warning light in the dash of you lose pressure. You'll see the two lines from master cylinder route down to the valve that has brake lines coming out going to front and rear axle.
The switch I'm speaking of is screwed into the top and if I recall correctly it's a single wire connection.
That may be what that connector is for if your fuel tank sending unit is connected.
Thank you. It is probably the sender. I don't think the wire is long enough to reach the brake valve. I looked, but did not see a wire missing. I'll look again. Thanks for the help
It looks to be the same as this one, correct? This is on my 79 4X4 manual trans, just forward of my front fuel tank. I had to track it down, thinking it had fallen off at some point. If I recall, it ended up being the transmission kick-down for automatic transmission but included in the wiring harness for all trucks, manual or automatic. This was just me looking it up, so others have said it is for all time 4x4 and they might very well be correct. Good luck
If you are converting to automatic, you will need to incorporate I believe.
Another tell, is the wire color. If you look back along it's length to a point that it's relatively clean and unmolested, see if you can tell it's original color. Or even if it's faded, we might be able to tell.
My guess is the 4x4 indicator lamp for full-time NP203 transfer cases.
As the others have mentioned, fuel senders use two contacts. The brake warning lamp is usually a different shape I think, but that may have changed in the later seventies. And older Ford lamp switches were two-prong as well. Not sure about '79 though.
Thanks for your help. I don't think it is long enough to reach the transmission. It will barely reach the t case. That is exactly the plug I have. The truck has always had the 205 transfer case, I believe. I can't see where there is a place to plug it in on either the transfer case or the transmission
Thanks
My truck doesn't have the indicator light. Maybe this is just a plug included in the harness that didn't get used unless you had full time four wheel drive.
Yep, only for the 203 transfer case.
The harness was there on all, but usually not the light on the dash. I think sometimes dashboard clusters got a lamp too, but it wasn’t active.
But the harness was kept that way for simplicity. One rear harness to rule them all! 🙄
I think my 79 still has that wire and connector as well. You can certainly tell that they were never used by their condition!
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