Wiring nightmare! Help!

[egil1963]

Okay, here what I've done, I took a 90 3.0L v6 and stuffed it into a 80 mini truck, got the wiring harness, but getting it all hooked up is killing me, can anyone provide me with a wiring diagram for the 80, I have the manuel for the 90. Better yet, is there anyone out there that would be willing to offer a little time and teaching to a wiring rookie? The motor fit in nicely, very minor mods to frame mounts. will post photos later.

give me a call 775-219-5319.

John

 

[pappy]

I'm not familiar with the 3.slow. I am familiar with the 22re and the 3FE and they wire up about the same. I suspect your 3.slow does too. So, taking a stab at this.

You should have two harnesses ... the main engine harness that is used unmolested, and the cowl harness which needs to be teased to remove the extra junk and take the harness down to just the EFI bits.

The ECU will only need a two wire hook up and I would recommend running off a separate fuse block. You will need a constant hot and a switched hot. Your gauges from your truck should work with the senders on the 3.slow (oil and temp) but you might need to extend the wires.

I suspect you can do this without the wire diagram from the 1980 truck. The 3.slow diagram is necessary to know how the extra wires hook up.

I'm not sure if this will help, but I wrote this up when I did my 3FE transplant into the FJ40. See if anything looks familiar: http://bushrat.hdcruisers.org/3FEconversion.pdf.

 

[egil1963]

Correct, the main engine harness went in with no problems, considering I have the fuse boxes from the 90, it made it fairly simple. The cowl harness is the nightmare, I'm trying to match up wires for controls, wipers, lights, gauges, etc and not getting very far due to differences in color designations on the wires. For now I am using the start switch from the 90 in existing harness, until I get other issues resolved. didn't find any help at bushrat site you provided. Thanks for time, if you have other directions, I'll be waiting...

 

[pappy]

OK, I get it. You are trying to use the 1990 harness complete in your mini.

 

[egil1963]

yes, that's what I'm up to, any suggestions?

 

[DanS HJ-45]

My suggestion (having swapped a diesel EFI into a '90 pickup, and now tearing apart a '79 FJ-40 harness) is that you spend some time getting to learn how the harness is put together.

It is really not that complicated, and Toyota used the same color codes for a long time. Break it down into systems. For instance, you can probably simply remove anything having to do with the air conditioning, and the dash clock. Start removing those wires (you probably don't need to cut either, the plugs can be taken apart--BTW) and it'll get a lot simpler real quick.

Learn how each system works (and they are all much simpler than you think) and learn how to remove pins from plugs, then plug those pins into the other plugs and you'll figure it out pretty quick.

Dan

 

[cruiser88]

you are thinking way to much.

start over one wire at a time. Dont let it get to you

 

[pappy]

A few more thoughts.

If your goal is the 3.slow in your truck, then by swapping in the whole cowl harness from the 1990 you are doing this this hard way. I can see an advantage, but it will not be that simple. The 1990 will have items in the harness you will not need or want. You will need to adapt, as Dan said, this harness to your mini's items. Easiest way is to just cut, solder, and shrink tube the connectors. As Dan said, you can sometimes move the pins, but sometimes the pins will not match the later model connectors. Most of the older stuff is 1/4" spade and you can buy those (I did a bunch of those on my project).

Also, if you tear into the 1990 harness to remove those connectors you don't need you could simplify the harness to your truck. Many of the items (Dan mentioned the clock) can be teased out back to the splices in the circuit, and the circuit closed back up with solder and shrink tube.

Personally, while this would be slick, it's too much work for me. I would rather leave your harness in place, and tease out from the cowl harness the EFI bits making a dedicated EFI harness that runs off its own fuse. This is exactly what I did with my 3FE.

 

[toy4xfun]

i think you need a fsm for the 80 with a wiring diagram, look on ebay.
good luck!

 

[egil1963]

It's more than time consuming, but it's coming together, slowly but surely. for those that offered advice, thanks, the rest, well you know. time and attention to detail is what is making this work, so I will just continue on my merry way.

 

[NorCalBorn]

*Pics when finished!! Let me know if you run across any specific wires or just search "Online Toyota FSM" and you'll have partial access to the NCT.... site and be able to download them.

 

[egil1963]

while surfing last night I found a public library with chilton manuals online - was able to print copies of everything I need from there. tonight when I get home I will post a link to this library for future reference.

 

[egil1963]

got pics, just need to get them downloaded. will try to do that tonight as well...

 

[egil1963]

Photos of Install

here's some pics will attach more

 

[egil1963]

more photos

here's some more. in order to get it to sit in there nicely, had to cut the frame mounts off and cut off 1/2" then weld them back to the frame.

 

[egil1963]

photos 3

Installing the tranny mounts was more fun, had to cut off the old mounts and install new ones, they had to be moved back approx 1-1/2".

 

[egil1963]

just in case anyone is interested, I'm slowly making progress, all that remains is turn signals/hazard, windshield wipers and washer, horn and finally the heater, I have the wires there, just need to figure out how to get them into lo med and hi modes. then comes the fun part of figuring out the instrument cluster.

 

[black95]

You are a brave soul. While I personally wouldn't have used a 3.0 liter, I think it is going to be very cool and unique. Great job, looks like it is something to be proud of.

 

[egil1963]

yeh I know, 3.0 troubles

I have heard of the problems with the 3.0, bad #5 cylinder and head gasket problems, only thing is I have not had these issues with this engine, not to say that it won't happen, just that it hasn't happened to me. The other thing is this is what I had available to use, it was kind of a freebee, so who am I to look a gift horse in the mouth. Truthfully, this whole swap has gone relatively smooth, and considering that I'm doing this pretty much so by myself, I'd think that I was making pretty good progress and looking forward to testing it to the limits.

 

[egil1963]

wiring done!

for the most part all of the major wiring is completed. I finished up last night with hazards, turn signals and the key switch. Found that the new switch had a couple of feeds on it that could be put on a side toggle and controlled off the dash. will post pics tonight at some point.