Bullnose Enthusiasts Forum

1986 F350 AC wiring help.

Classic

List

Threaded

12 messages Options

VWThomason

1986 F350 AC wiring help.

So I've got a 1986 F350 originally 6.9 C6. Previous owner removed those and didn't keep his promise of leaving all wires in place. I've swapped a 97 12v into and converted everything to AC from a 1996 F350.

My current dilemma is, I'm unable to locate the AC wiring harness or identify the correct wires.

Since the truck had AC from the factory I'm trying to use the basic factory controls and trying to avoid making a new harness.

If you've got or can take pictures, videos, or quality wiring harness diagrams you could share I would be much appreciated.

The Polar Bear - 1986 F350 Crew Cab Long Bed Dually. Starting life as a 2wd 6.9 C6 truck. Now has Cummins P-pump that is slightly turned up. Running ZF-5 transmission with BW4407 transfer case. Converting to 4wd with some help from a SKY RSK kit with SD springs on top of a 1996 Dana 60. Also using the SKY kit to convert the rear to 2008 springs. More to come.

Clifford - 1993 F250 7.3 IDI ATS 088 turbo with a ZF-5 behind it and 4.10 gears. Lifted along with solid axle D60 swap. Running Baja military 37s

Gary Lewis

Re: 1986 F350 AC wiring help.

Administrator

You've looked at the wiring diagrams in the EVTMs? Like this one from the 1985 EVTM?

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

VWThomason

Re: 1986 F350 AC wiring help.

I did look at that, but finding the wires in my truck has been the issue so far. Idk if they were completely pulled out or they're cut somewhere and I can't find the ends.

Gary Lewis

Re: 1986 F350 AC wiring help.

Administrator

Oh, ok. I'll see if I can take some pics tomorrow.

Gary, AKA "Gary fellow": Profile

85lebaront2

Re: 1986 F350 AC wiring help.

Administrator

In reply to this post by Gary Lewis

Gary, if he needs it Darth is converted to 1996 AC system and I have the 1996 EVTM.

Bill AKA "LOBO" Profile

"Getting old is inevitable, growing up is optional" Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator Wife's 2011 Flex Limited Daily Driver 2009 Flex Limited with factory tow package Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413

VWThomason

Re: 1986 F350 AC wiring help.

So I've looked and looked and looked! Finally a friend who has a parts truck was able to look at his and apparently I'm missing the entire wiring harness for the AC.

I just have to find the wires in the loom that are correct for the AC now. So either another wiring diagram that I used was wrong or my wires aren't the correct colors.

Will still be happy to see more pictures. I'll be looking at it again tomorrow.

salans7

Re: 1986 F350 AC wiring help.

I think I have a spare A/C harness I pulled from a 1986 with a 6.9 if you want me to take pictures of that.

Gary Lewis

Re: 1986 F350 AC wiring help.

Administrator

Sorry, I didn't get to it today. I could have probably gotten pics under the hood, but after the chiropractor appointment I couldn't imagine crawling under the dash.

Gary, AKA "Gary fellow": Profile

VWThomason

Re: 1986 F350 AC wiring help.

I've found some parts of the wiring they were tucked up underneath the heater box and I wasn't able to see them trying to work on it in the dark. Now I understand most of it.Ijust need to know what else is suppose to connect right here. And yes I know it's melted. I'll be fixing that soon.

salans7

Re: 1986 F350 AC wiring help.

That cut wire goes to the harness that you are missing. There's supposed to be a single blade connector (C228) at the end of the wire, and then the harness you're missing plugs into that connector.

VWThomason

Re: 1986 F350 AC wiring help.

That makes sense. That's what I was thinking. What is suppose to go on the left side prong on the resistor is where I am at now. And since this is actually 96 AC system I have to figure out the high side switch too.

VWThomason

Re: 1986 F350 AC wiring help.

Okay so I've pretty much figured out I will not be able to use the high side switch because I do not have an ECM to run it.

So I'll just have it setup like it was from factory with just the single clutch cycling switch on the accumulator/drier.

Then when I charge the system I'll have to monitor it for a while to make sure I don't have a risk of over pressuring the system. But I've had several r12 systems converted to r134a without issues and they only have the single clutch cycling switch. So, I don't see it being a major issue. If it ends up not being cool enough in the cab during the summer I may look into making a custom rear AC.

And I realized there is not suppose to be a prong on the left side on the upper connection. I've just about got it figured out.

Time to move onto other wiring and fuel lines so I can get this thing on the road.