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1986 f-250 6.9 diesel Wiring issues. NEED diagram.

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Old 10-04-2009, 03:25 PM
shanes66charger shanes66charger is offline
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1986 f-250 6.9 diesel Wiring issues. NEED diagram.

Hey guys.

I just bought a 1986 F-250 4x4 4-speed with a 6.9 diesel. Truck runs great etc. There is only one battery in it and it has a new alternator. We noticed once we got it home that the wiring around the solenoid and regulator is all melted and burned up. We don't know what happened to it but its toasted.

Wondering if anyone here has a diagram of the wiring they could post??

Also, is there any way to TEST the glow plugs also?

any help is appreciated!

thanks!
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Old 10-04-2009, 03:52 PM
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there is supposed to be 2 batteries one on the drivers side and one on the passenger side. and I suck with wiring so thats all i have to say haha
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Old 10-04-2009, 09:02 PM
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Here's a diagram of the engine wiring. I don't believe it shows all the wiring on solenoid on the fender(power relay), but usually in the diesel trucks the solenoid is just a junction for power distribution. You willl notice the large battery wiring goes directly to the starter, and that is the power priority. They will have a smaller wire coming off the battery feeding the solenoid. The keyswitch activates the solenoid in "start", and in turn sends a signal down to the starter solenoid mounted to the starter.

All the other connections on the solenoid are on the same terminal as the bat + is connected, and this a power distribution point for the glowplug system, the power for the cab, the spot were the alternator is hooked up, etc.
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Old 10-04-2009, 10:22 PM
shanes66charger shanes66charger is offline
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hey thanks a ton man, This SHOULD be enough to at least get us started.

Thanks again!
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Old 07-23-2011, 08:00 PM
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look on top of your GP controller looks like the wire might head that way according to the picture if you find it then use your meter and disconnect that wire on top of the gp relay and ohm it out if continuity is present then its the right wire and looks like yur gp relay is bad
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Old 07-11-2014, 01:32 PM
mstreman mstreman is offline
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I have an 86 F350 6.9 with starting issues. While tracing wires I found a tubular, 2 contact, female connector which comes off the harness very close to the alternator. I've searched for an hour and cannot find any male connectors to plug it into. Before I try to upload a photo does anyone know off hand what this should go into?
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Old 07-11-2014, 09:08 PM
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That would be the connection for the tach sensor
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Old 07-11-2014, 10:50 PM
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Quote:
Originally Posted by ifrythings View Post
That would be the connection for the tach sensor
Great! and thanks, I am looking that up-- timing gear cover--- Now if I can find it on the truck. Thanks for the assist.
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Old 07-12-2014, 01:25 AM
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Right there, front and center. It's the cover with the oil-fill in it!
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Old 07-12-2014, 05:13 AM
mstreman mstreman is offline
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Ah so..mine is missing and has a pipe plug.
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Old 07-12-2014, 04:01 PM
madpogue madpogue is offline
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Is your tach the factory one? If not, and if it's not an automatic, there won't be a tach sensor. My '85 T19 XL has no tach, and a plug in the sensor port. There is no crank or cam sensor.
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Old 07-13-2014, 12:44 AM
mstreman mstreman is offline
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My Bad -- I was thinking of the wrong truck--I have several and mentally commingled them. This one had no tach.
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Old 07-13-2014, 11:50 AM
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So the tach sensor isn't "missing", it was never there.

So what's your starting issue?
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Old 07-13-2014, 12:04 PM
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Quote:
Originally Posted by madpogue View Post
Is your tach the factory one? If not, and if it's not an automatic, there won't be a tach sensor. My '85 T19 XL has no tach, and a plug in the sensor port. There is no crank or cam sensor.
I guess the tach is part of an option package. My '85 XLT Lariat was factory T19 and it has a tach.
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Old 07-13-2014, 05:47 PM
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So the tach sensor isn't "missing", it was never there.

So what's your starting issue?
I got it started ,finally! I think over the three years sitting all the fuel flowed back into the tank and left Air where there should have been fuel. Got it started and had 5 leaking return fuel cups . Replaced all 16 o-rings. ( Got them at Tractor Supply for 1.99 for 8) These are hydraulic applications so hope they will last. Everyone of the o-rings had lost elasticity. No leaks

The remaining problem is that when I switch to the front tank the fuel level meter goes to zero and within a few seconds the engine starts missing. I will finish up the o-ring installation tonight and start on blowing out lines to the tank and see if that is the problem. >>>>>>>>>Carried to a new thread<<<<<<
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