I've run into a snag... electrical... (1 Viewer)

[raymond2335]

I'm trying to bring my 1971 fj40 to life via a 1973 wire harness. Up to a point, it was plug and play. I got some really good advice from coolerman. I hate to keep going back to the well, so I thought Id reach out to the forum... I'm down to blinkers, flashers and brake lights. I broke down and took the truck to an "automotive electrical specialist" (Notice I put that in quotes??) He has had it for a week now, and no he didnt move it inside during the monsoon we got the other day... It's newly restored and Im just trying to get blinkers and brake lights... and since most of these functions go through the hazard switch, hazards as well. He called me today with three questions....

1- Why is there three more fuses on the '73 then on the '71? what do the three extra fuses feed?

2- can Ifind out wire designations for the 6 wires coming off the harness for the blinker switch..(Coolerman has helped me with question #2)

3-I sent the haynes manuel along that has a wire diagram, thinking that he would be able to find his answers there... But there must be more to it.....??

I have that impending feeling that im about to get screwed by this shop... so trying to supply as much info to him as possible. I'm sure its a cluster trying to make this work. Has anyone else tried this??

 

[Solace in Solitude]

I'm surprised that an "automotive electrical specialist" would ask why one year has more fuses, in the fuseblock, than the other... more circuits in '73.

These pics show '71 had six circuits

... And '73 had 8 circuits

You can find wiring schematics for both years on @Coolerman's website, Coolerman's Electrical Schematic and FSM File Retrieval

Edit: FYI... some items, like "horn", had their own fuse in '71... In '73, "horn" was included in the "engine" circuit... If I'm reading the schematic correctly, on my iPhone.

 

[raymond2335]

haha Yea... this "automotive electrical specialist" spent ten minutes telling me how good he is... story after story of how he solved this problem and that problem on other projects. One more bad omen.... He called to talk to me on thursday about the "jeep" I dropped off. Keeps telling me how things work but he can't put it into action... This knot in my stomach is growing

 

[Coolerman]

Basically you have a 1973 harness, and want to connect it to your 1971 switches.

Do you know the month of the 73 harness? If it is a true 73 (9/72 to 9/73) be aware that that is the ONLY year for that harness. That means that the Hazard switch is unique to that harness. The turn switch is not so unique and the connections I gave you in a PM should work for that.

I have never found a true 1973 harness schematic, so I do not know electrically exactly how the turn/Hazards are different.

I take it the 1971 Hazard switch with the 9 pin female connector plugged right in to the 73 harness?
I know that the 1972 harness has the 9 pin female Hazard switch connector, but a 1974 harness uses a completely different connector for the Hazard switch. IF it did plug in, I cannot imagine that Toyota would have changed the way that circuit works between 71 and 73.

Worse case: if you know someone who would let you borrow a 1973 Hazard switch, you could rule that out as a possible issue...

 

[raymond2335]

I believe the hazard switch on both wire harnesses had the same number of wires. Same wire colors as well. So basically I spliced the plug off of The 71 onto the 73 harness. Im trying to keep the knobs uniform (71). The knob pull-shaft is slightly bigger on the 73. Was this a mistake?

 

[Coolerman]

So the Hazard switch connectors between the 71 and 73 were not the same? Can you post a pic of the 73 harness side Hazard Switch connector?

 

[raymond2335]

So the Hazard switch connectors between the 71 and 73 were not the same? Can you post a pic of the 73 harness side Hazard Switch connector?

Shoot... I just cleaned my shop floor last week and it must have gotten thrown away. I do remember it was a 6 wire plug only about half as long as the '71. Just a smaller version. It made it easy to splice the larger '71 plug onto the wires. I'm sitting here second guessing my connections... thinking about the problems the "automotive electrical tech" is having making things work. It will be a big hit to my pride if I screwed those connections up. I used shrink solder connectors. Foolproof to a point... I didnt realize that the 1973 wire harness was a rare bird...

 

[Coolerman]

The OEM 71 Hazard switch is a 9 pin small plug. See pic

The 73 should have the same 9 pin the 71 and 72 FJ40 uses. 9/73 they switched over to the odd 10 pin connector.

 

[raymond2335]

Your right... 9 pin not 6. But I had to splice the larger 9 pin plug onto the 73 harness to make it Compatable with the 71 switch. CONFUSING!!!

 

[Dodgrr]

Get that thing back and do it yourself, you've got this!!

Proud 73 owner here, PO had clipped my signals and brakes, painted the harness w black spraypaint.. I know your pain!! I stumbled though mine after being unable to track down a wiring diagram that matched what I had in my hands. Took 3 days and a lot of swearing, let me know if you want any tips on my process of elimination / method of madness hahah good luck either way!!

 

[73FJ40]

@Coolerman @raymond2335
For the record, I have a Jan 1973 FJ40. The following is a picture of the hazard switch connector (left) and its mating harness connector: (click to enlarge)

It has nine active pins, in a connector with 2 rows of 5 contacts (10 positions, only 9 used)

 

[raymond2335]

Yes... that’s what I had on my 73 harness. I cut and spliced the smaller end on to mate with my old style knobs. I was trying to stay ‘71 it’s all coming back to me now...! Sorry my memory is disappearing faster then my bank account throughout this restoration. Time for it to end!!

 

[Dudleyfj40]

Just saw this thread.
You found the right guy with Coolerman! I will be willing to help also.
Quinn told me you didn't need your hazards wired. I figured you were ready to get it back. I told him it's a fresh build, he's gonna need hazards. LOL

 

[Martyt]

Even with a schematic, you should still be able to bumble yourself through unknowns— trial and error. I just got my stop lights going tonight after some time- all lights now fully functioning. Coolerman? Ya, he is really the world wide expert— has helped me out personally and indirectly with old posts from him

 

[peesalot]

It was asked why there were 3 more fuses on the 73, Ii is written on the covers what the fuses are for, what more clarity do you need ?

 

[raymond2335]

Ya the fuse cover is missing. One small detail among many others... . I’m concentrating on the mandatories right now....

 

[raymond2335]

Good point... I’m getting desperate to get that thing back! Hazards may be one of those luxuries.

Just saw this thread.
You found the right guy with Coolerman! I will be willing to help also.
Quinn told me you didn't need your hazards wired. I figured you were ready to get it back. I told him it's a fresh build, he's gonna need hazards. LOL

 

[73FJ40]

@raymond2335

Good point... I’m getting desperate to get that thing back! Hazards may be one of those luxuries.

I think that if you look closely at a wiring diagram, the hazard switch is integrated with the directional switch and the stop lights.

If you re-wire it without the hazard switch, which is a lot of work, you may have even more headaches trying to add the hazard circuit back in later.

 

[raymond2335]

Good point. I’d better check on that...

 

[Dudleyfj40]

If you don't have a newer style haz switch, I do.

For a idea of how picky the electrical system is on the FJ40's, I put the wrong 12v bulb in my turn indicator, the whole left side turns stopped working.