Builds 75 Series Truck - VZ shade tree special

[2fpower]

another note - or advice - for the brave souls that want to do something like this again.

The way that I got all the circuits out that I knew that I did not need. I would identify what a plug was for, then backtrace it along the wire to confirm what it was going to, then cut it out, marking both sides with a number in case I needed to put it back. special attention was made to splices as toyota does alot of in line splices where one wire feeds several things. So, I would cut the wire when it spliced into another.

When I got all that out, I had the plug going to the rear of the car with about 10 wires on it still. I could not find a pin out diagram of that connector and what all the wires were for. Also I was doing a LX450 harness using a LC EWD, but that is another story.... anyway, the pdf of the EWD was searchable for text, so I searched for that plug identifier, I think it was ID2, and then went through the whole EWD at that plug number, then figured out what each wire was for. Really was not too hard once I figured out a way to determine what each wire was for.

 

[Loober]

You are an animal, I am getting anxiety from just reading about you doing this.

 

[2fpower]

Down to 13 wires coming from the engine and/or ECU going to the car....

 

[2fpower]

For all the people stupid enough to follow me down a rabbit hole.

@AlbertoSD (that is you)

There are 5 plugs coming out of the engine that go through the firewall and plug into the interior harness. 3 of those plug into the ECU, and then there is one harness that plugs into the ECU and goes to the interior harness -- plug designation is E7. The two from the engine that we are dealing with are IH1 and IH2. Additionally, you need to give power to the fuel pump and grab the fuel gauge and low fuel light wire.

I have made Pin out details:

 

[2fpower]

And IH2 plug

 

[joekatana]

Down to 13 wires coming from the engine and/or ECU going to the car....

View attachment 2169517

View attachment 2169518

View attachment 2169519

You might want to consider making a few of those harnesses and list them for sale , I am sure there are a few people wanting one of these that are missing your electrical skills !
Great job

 

[2fpower]

I'm not here to make money... just to share and pay it forward.

And let's be honest.... this is not really a uber-sexy engine. But it is a reliable tractor engine that is good for 300k miles....

 

[AlbertoSD]

For all the people stupid enough to follow me down a rabbit hole.

@AlbertoSD (that is you)

There are 5 plugs coming out of the engine that go through the firewall and plug into the interior harness. 3 of those plug into the ECU, and then there is one harness that plugs into the ECU and goes to the interior harness -- plug designation is E7. The two from the engine that we are dealing with are IH1 and IH2. Additionally, you need to give power to the fuel pump and grab the fuel gauge and low fuel light wire.

I have made Pin out details:

View attachment 2169823

View attachment 2169824

View attachment 2169825

View attachment 2169826

Thank you, kind sir!!

-Alberto

 

[2fpower]

Next step was to move the needed relays and fuses to the same box

These two fuses are all that are needed. Notice ECU-B and ECU-IG are not needed.... strange....

Only need one relay on the inside kickpanel

And one relay, two fuses and the main 50Amp fuse.

 

[2fpower]

First step was to figure out how to remove the wires on the kickpanel relay. this was the right tool... push it in just like that in the middle of the connector, and it will raise the plastic retainer.

and the wire comes out the back.

So after moving the wires from the two fuses to the outside box I have the two new at the top.

 

[2fpower]

And then suddenly the wiring harness looks even simpler.

 

[joekatana]

I'm not here to make money... just to share and pay it forward.

And let's be honest.... this is not really a uber-sexy engine. But it is a reliable tractor engine that is good for 300k miles....

Not everyone can or want to spend +10k on a engine swap and with the surplus of 7x cabs that are mounted on 80 frames now I am pretty sure several folks want to keep the price down and reuse the 1FZE that came with the 80 donor but lack the skills of sorting trough the electrical nightmare ......... there is a reason why I only use 1wire diesel engines in my builds

Anyways great build and keep those pics coming please .

joe

 

[2fpower]

Well..... this is the time. If anyone is interested in a harness, I have a good friend that has a company that makes harnesses.

If there is interest, I will give it to him to plot and duplicate.

 

[Mr Cimarron]

I thought I would make my own from scratch. Wouldn’t recommend it. The engine side was a piece of cake since it’s a diesel. Cab side is a nightmare. I know I have over 40 hours into it easy and only about half way finished. That doesn’t even count the hours drawing out the schematic for reference. The CDL and locker ECUs are the only pieces I kept from the 80.
Only good thing is I will know everything about my electrical.

 

[c2dfj45]

I'm having a tough time looking at the pics of all the wiring in this thread.....lol. Brings back bad memories.

 

[2fpower]

anyone have electrical wiring diagrams for a 75 series?

 

[2fpower]

Just did a systems check, winshield wiper motor is not getting any power and has a strange resistor in line next to. Can’t find the horn or where the horn wire would be coming from. Everything else seems to work.

These two wires appear to be used to going to the carburetor and likely engine sensors.

 

[Mr Cimarron]

Just did a systems check, winshield wiper motor is not getting any power and has a strange resistor in line next to. Can’t find the horn or where the horn wire would be coming from. Everything else seems to work.

View attachment 2171437
These two wires appear to be used to going to the carburetor and likely engine sensors.

View attachment 2171438

View attachment 2171439

That photo showed me that I’m missing the wiper motor cover with the connector on it. The mine company hard wired everything so I had to added pigtail. Is the resister part of PO intermittent wiper job? I have been going through my wipers the last few days. I had to order a VW relay to use for intermittent wipers since I was missing factory one.

 

[Mr Cimarron]

anyone have electrical wiring diagrams for a 75 series?

I have one from a 70 series and works pretty well. It overlays 60 and 70 12V and 24V in the schematic so that gets tricky but wire color match. I got it here on MUD but don’t know if the links work.

FAQ - Online Repair Manual Sources

Thx! Ordered the part yesterday thinking that it was my best option. Hello, It is. Older fusible links are becoming hard to find. Juan

forum.ih8mud.com

 

[Honger]

anyone have electrical wiring diagrams for a 75 series?

What engine did this have originally? I’ve got some chassis/body manuals with body electrical info at least... got them from @Onur.