Joe's project
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Joe's project
hey guys!
First thing first, this forum has been super helpful in my quest to bring my monster to life. Last year I bought my first real truck an 86 F350 6.9 idi. I got to drive her all of three months before the monster revealed just how poorly it was maintained. So a few thousand dollars later I pulled the engine and got a new longblock to swap out. I just finished with all the engine work and replaced more then I kept, but before I drop this monster in I have to tackle the wiring harness under the hood. The dash wiring seems to be in order but the previous owner has butchered what is left. Is there a company that I could contact to make a new harness? The few diagrams I have been able to locate are vague at best and I don't want to waste time. I was thinking of just cutting it 8 in off the firewall and running new wires from there with new connectors, but I would like to hear some of your guys opinions at this point before I tackle this hurdle.
First thing first, this forum has been super helpful in my quest to bring my monster to life. Last year I bought my first real truck an 86 F350 6.9 idi. I got to drive her all of three months before the monster revealed just how poorly it was maintained. So a few thousand dollars later I pulled the engine and got a new longblock to swap out. I just finished with all the engine work and replaced more then I kept, but before I drop this monster in I have to tackle the wiring harness under the hood. The dash wiring seems to be in order but the previous owner has butchered what is left. Is there a company that I could contact to make a new harness? The few diagrams I have been able to locate are vague at best and I don't want to waste time. I was thinking of just cutting it 8 in off the firewall and running new wires from there with new connectors, but I would like to hear some of your guys opinions at this point before I tackle this hurdle.
Laughing Gas
Joined: Mar 2016
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hi joe ..
glad to have you on the idi team ..
86' is a good vintage indeed ..
.. i don't think any company makes a harness ..
though it's really simple ..
i believe 3 wire leads to the i.p.
one set to the alt.. and another to the starter ..
and also the connector for the a.c. coil ..
also there is the wire leads to the fuse panels .. headlights .. ect ..
and also the glo plug wires if you use those ..
so i would just try and locate a good harness from the scrap yard ..
or fix the one you got ..
i can snap pics if you'd like .. i have an 85' so it'd probably look the same ..
glad to have you on the idi team ..
86' is a good vintage indeed ..
.. i don't think any company makes a harness ..
though it's really simple ..
i believe 3 wire leads to the i.p.
one set to the alt.. and another to the starter ..
and also the connector for the a.c. coil ..
also there is the wire leads to the fuse panels .. headlights .. ect ..
and also the glo plug wires if you use those ..
so i would just try and locate a good harness from the scrap yard ..
or fix the one you got ..
i can snap pics if you'd like .. i have an 85' so it'd probably look the same ..
Postmaster
Joined: Dec 2011
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You can do A, B or a mix of both. Run new wires for critical stuff if you wish; it'll be a lot easier to keep electrical gremlins out if you do. You can use terminal strips like this: Molex Incorporated - 38770-0108 - Clsd back 20 A Series 77000 Double Row 9.53 mm 8 Term Strip Conn - Allied Electronics to allow for easy disconnection and testing for your new wires, so when you need to pull motor parts and/or figure out why something isn't working, you've got nice test points.
You'd probably want to put a cover of some sort over the terminal strip once your done, to prevent crud from falling on it(depending on position).
You'd probably want to put a cover of some sort over the terminal strip once your done, to prevent crud from falling on it(depending on position).
Postmaster
Joined: Aug 2010
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From: Northern Arizona
Gary Lewis' Garagemahal website has the 1986 EVTM. It is a great resource, as it the rest of Gary's site. Links 5 and 7 of the EVTM deal with diesel specific wiring. Good luck!
1986 EVTM - ???Gary's Garagemahal
1986 EVTM - ???Gary's Garagemahal
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Thanks guys for the feed back, I will be tackling the wiring saturday hopefully. I am having a bit of a problem tracking down the two engine temperature senders and the fast idle solenoid. I do not want to use junkyard parts to replace the old ones that are not working. A point in the right direction would help
Postmaster
Joined: Dec 2011
Posts: 3,860
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Thanks guys for the feed back, I will be tackling the wiring saturday hopefully. I am having a bit of a problem tracking down the two engine temperature senders and the fast idle solenoid. I do not want to use junkyard parts to replace the old ones that are not working. A point in the right direction would help
Make sure that if you put 12V to the terminal on the fast idle solenoid, and then pump the throttle, that the solenoid sticks in the "high" position.
These solenoids never had enough juice to overcome the throttle spring by themselves; you always have to blip the throttle.
Also, they are pretty hard to come by, but don't usually tend to fail...
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