Early Idle Solenoid OEM Wiring

[Coolerman]

I am doing more OEM wiring harness documentation on the early 68-72 harness and need some OEM information.

After reading 4 pages of results from searching on Idle Solenoid, I finally found a post by Jim C. stating that the 68-72 idle solenoid was connected straight to the coil +.

OK what I need to know now is this:

1. Was the wire terminated at the coil end with a ring terminal or was it pig tailed off the BY wire connected to the coil + from the IG switch?

2. Was the wire BY also?

3. Was it terminated at the carb side with a female bullet and the solenoid had a short wire with a male bullet? Or was it a one piece wire from the coil into the solenoid?

Idave?

 

[IDave]

I have NEVER found a FSM diagram that showed where the idle solenoid is wired, so I would take Jim's word for it. The original wire on my NOS nonUSA carb is solid black cloth covered, and I think it had a ring connector on it, but I bulleted it for convenience. I have always connected it to the positive terminal of the coil without problems, but recently Pin_Head recommended using the IG terminal of the alternator regulator. He said the potential for serious electrical issues is high for putting it on the coil, so I've switched over and it works well also.

 

[Coolerman]

Your saying originally it had a LONG black cloth covered wire all the way from the carb to the coil? All the pics I have seen show just a short pig tail off the carb.

Funny how Toyota never documented the idle solenoid or the ballast bypass system...

 

[IDave]

Your saying originally it had a LONG black cloth covered wire all the way from the carb to the coil? All the pics I have seen show just a short pig tail off the carb.

Funny how Toyota never documented the idle solenoid or the ballast bypass system...

That's what I have. The original wire will definitely reach the coil. I had to extend to reach the regulator. It is possible that the original retard carbs from our era had a different arrangement. I will check a couple others around here if I remember.

 

[65swb45]

Your saying originally it had a LONG black cloth covered wire all the way from the carb to the coil? All the pics I have seen show just a short pig tail off the carb.

Funny how Toyota never documented the idle solenoid or the ballast bypass system...

LONG black cloth covered wire all the way from the carb to the coil.

Connector at the coil was a right angled prong connector/ brass composition. Not sure of the industry term for it.

This is beyond trivial!;p

 

[Coolerman]

I just updated the 1971 schematic labeled 71fj40_wireCleaned.tif on the schematic download page to show the idle solenoid connection.

Coolerman's Electrical Schematics and FSM File Retrieval

 

[IDave]

LONG black cloth covered wire all the way from the carb to the coil.

Connector at the coil was a right angled prong connector/ brass composition. Not sure of the industry term for it.

This is beyond trivial!;p

Oh, yeah! Now I remember that fork connection! Easier to take off for valve cover removal.

 

[Coolerman]

LONG black cloth covered wire all the way from the carb to the coil.

Connector at the coil was a right angled prong connector/ brass composition. Not sure of the industry term for it.

This is beyond trivial!;p

One day some anal retentive restorer is going to want to know this piece of trivia

A connector like this? Mounted under the coil + stud nut? Waytek calls them .250 push on's or quick disconnects. The carb wire would have the female version to plug into this...

 

[Cruiser_Nerd]

A connector like this? ...

Negative. It's been a long time, but if Mark's description kicked the correct brain cell in my head, it looks like this :

 

[Coolerman]

Ah... Gotch ya...

Toyota would have used the spade lock version of that spade terminal. Like this connector from my fuse block.

 

[Pin_Head]

Toyota discontinued wiring it to the coil sometime in the early/mid 70s and ran it off the engine fuse circuit. The coil circuit is not fused (presumably for reliability) and it doesn't need another wire and device hanging off of it that can short out and kill the engine, which could be a safety issue.

 

[FJ40Jim]

Negative. It's been a long time, but if Mark's description kicked the correct brain cell in my head, it looks like this :

Ah... Gotch ya...

Toyota would have used the spade lock version of that spade terminal. Like this connector from my fuse block.

It is a crimped flag terminal w/ a bit of heatshrink for strain relief.
Not a spade lock.

Would a picture be helpful?

 

[JackA]

I just installed a used solenoid on my 70 55 last night. It had the OG flag connector as stated. There's also a tab on my valve cover to hold this wire.

 

[FJ40Jim]

And if the wire is in good original condition, there is a piece of heatshrink that goes in the valve cover clip. The heatshrink may have slid up or down the wire.

 

[Coolerman]

It is a crimped flag terminal w/ a bit of heatshrink for strain relief.
Not a spade lock.

Would a picture be helpful?

Sure a pic would be helpful! Till then I think I get the idea. I wondered what that tab was for on the valve cover, I thought it was to hold the vacuum line.

 

[Coolerman]

Toyota discontinued wiring it to the coil sometime in the early/mid 70s and ran it off the engine fuse circuit. The coil circuit is not fused (presumably for reliability) and it doesn't need another wire and device hanging off of it that can short out and kill the engine, which could be a safety issue.

Bet you get tired of looking that up and posting it each time.

Though I'm documenting to OEM specs when I start putting my actual harness back together I'm going to tap in to the WR wire from the fuse to regulator B+ as you suggested somewhere else and run it out the firewall on the drivers side.

 

[IDave]

Ok, here's the real actual thing from a 12/71. A little oily. It's actually bronze colored when cleaned up.