Real Time Help Needed: Picture of Ignition Coil

[DieselFJ]

I am trying to fix the previous owners hack and need to have a picture of a 78's ignition coil/igniter and where it connects to the wiring harness. This is on a 78 Fj55, The previous owner cut the wires so I have two connectors coming off the ignition coil and I have two cut wires on the wiring harness. One of the wires matches size and color, that would be the larger black/yellow. The other cut wire is a smaller black/yellow, which I believe hooks together with the larger one. The other wire is smaller and solid black, this is the one that I don't know where it hooks too. The wiring diagram states one wire goes to the starter, and the other comes from the ignition. It looks like the larger black/yellow is the one that comes from the starter which is black/white down at the starter, I can not find the other. Any help would be greatly appreciated.

Thanks
Scott

 

[DieselFJ]

Anyone????

 

[edwjmcgrath]

The BY wires are "Hot" when the ignition switch is on.
They run from the ignition switch, to the bypass resistor positive and to the BY terminal on the ignitor.
The bypass resistor negative connects to the coil positive with a BY wire too.
The starter connects to the coil positive with a BW wire.
The B wire goes from the coil negative to the ignitor B terminal.

 

[DieselFJ]

The BY wires are "Hot" when the ignition switch is on.
They run from the ignition switch, to the bypass resistor positive and to the BY terminal on the ignitor.
The bypass resistor negative connects to the coil positive with a BY wire too.
The starter connects to the coil positive with a BW wire.
The B wire goes from the coil negative to the ignitor B terminal.

I didn't realize that the 78's had a bypass resistor, do you have pictures by chance? I don't know what else I might be missing.

Thanks for the reply
Scott

 

[edwjmcgrath]

No picture of wiring, but here's the schematic.
You can live without the bypass resistor and the wire to the starter.
I've got a newer GR starter without the terminal, so I removed the resistor and went with a 12v coil, a so called "built in resistor" coil.

 

[DieselFJ]

No picture of wiring, but here's the schematic.
You can live without the bypass resistor and the wire to the starter.
I've got a newer GR starter without the terminal, so I removed the resistor and went with a 12v coil, a so called "built in resistor" coil.

Did all 78 Cruisers have a bypass resistor? As I look in the owners manual is shows tow different options, the first has the resistor mounted to the top of the ignition coil, and the second shows an option without the mounted resistor. Was there a remote mounted resistor? Also I have a distributor with two wire clip and it mounts to the coil clip without going through any resistor.

 

[edwjmcgrath]

Something is odd here. In 9/77-7/80, Toyota dropped the bypass resistor. This is consistent with what you are seeing. However, if there's no resistor, then there's no need for a wire from the coil to the starter because there's no bypass resistor to "bypass".

How many wires are there on the starter? Obviously the big power and ground wires are there. There should be 1 white and black wire from the key switch to the starter solenoid. And if you have a resistor, then there should be a second black and white wire that runs to the coil.

If you have that second wire, then I would guess that they made the resistor part of the ignitor so that wire should go to the igniter.

My 78 is non-US and the ignition is different, so I can't compare with it.

Here's a picture of the igniter that should be in your vehicle showing the connectors that you should have, if that's any help.

 

[spotcruiser]

This is the coil and ignitor of my '78. I bought it new and haven't changed it. I can try to get more detailed photos, if you need them.

 

[DieselFJ]

This is the coil and ignitor of my '78. I bought it new and haven't changed it. I can try to get more detailed photos, if you need them.

Is there anyway you could get a picture of the wires on the harness side? My igniter has two separate wires with two separate connectors but I believe the wires on the harness side should be the same

Thanks

 

[DieselFJ]

Something is odd here. In 9/77-7/80, Toyota dropped the bypass resistor. This is consistent with what you are seeing. However, if there's no resistor, then there's no need for a wire from the coil to the starter because there's no bypass resistor to "bypass".

How many wires are there on the starter? Obviously the big power and ground wires are there. There should be 1 white and black wire from the key switch to the starter solenoid. And if you have a resistor, then there should be a second black and white wire that runs to the coil.

If you have that second wire, then I would guess that they made the resistor part of the ignitor so that wire should go to the igniter.

My 78 is non-US and the ignition is different, so I can't compare with it.

Here's a picture of the igniter that should be in your vehicle showing the connectors that you should have, if that's any help.

Yea, I am not sure what's been done,I definitely have the black/white from the starter and I do have the resistor, but my coil/igniter looks like the model without the resistor. I will get some pictures later today.

Thanks

 

[spotcruiser]

I'll get another picture, but you can see the single 2-pole connector, which should be B/Y to the coil + and B/Y to the ignitor. Outside of the connector, there are a couple of W/B ground wires connected to the coil mount.

There may be a slight variation on a 55, tach connector perhaps? 60-series trucks had a tach connector, but I don't know whether 55s had that or not.

I believe that later-model coils (certainly '78 and later, but possibly '77) had higher internal resistance and did not use a seperate ballast resistor.

Is there anyway you could get a picture of the wires on the harness side? My igniter has two separate wires with two separate connectors but I believe the wires on the harness side should be the same

Thanks

 

[Pighead]

No tach in FJ55s...

 

[spotcruiser]

There you go. Your '78 55 should be just like my 40.

Thanks Pighead.

No tach in FJ55s...

 

[DieselFJ]

Thanks for the reply's, attached are pictures of what I have, maybe someone could make more sense of it than I can.

Thanks

 

[DieselFJ]

And More.......

 

[DieselFJ]

So, the resistor that you see in the picture I believe was an add-on the previous owner installed when he removed the coil/igniter and went with a coil only and 60's era distributor. On Friday the 60's era distributor gave up the ghost so I decided it was a good time to put it back to stock as much as possible. From the purchase I had the original igniter/coil and distributor. During this process I decided to put a stock 78 carb back on it as well. Anyway any help would be and already has been greatly appreciated.

Thanks

 

[DieselFJ]

As you can see on the igniter/coil itself I have a large gauge black/yellow wire, and a smaller gauge black wire. The cut wires in the factory harness are large gauge black/yellow and small gauge black/yellow. From what I gather those both would be attached together and would be attached to the large gauge black/yellow of the coil. The problem I have is the other black small gauge wire of the igniter/coil, where does this get connected?

 

[spotcruiser]

Sorry about the quality of the first photo. The camera focused on the bolt, rather than the connector, but you can still see what I wanted you to see.

First photo is the back (harness side) of the coil/ignitor connector. One large B/Y wire that runs to the coil + and one small B/Y wire that runs to the ignitor.

The second photo shows the coil side of the connector and the two W/B ground wires that also exit the harness at that point. I don't have the bullet connector shown in your photo, but a set-up like that is typically for a condensor. My truck is early '78, perhaps yours is later and has the condensor connection. My '78 wiring diagram does show a condensor, with a B/Y wire.

Third photo is of the starter connections. Battery + cable, of course, with the quick-disconnect-lugged B/Y wire going to the QD lug on the starter, and the 1-pole connector B/W wire going to the connector on the starter.

Your ignitor is a later model, but that should be OK. I don't know exactly what model without looking up the part number. It doesn't look like your resistor is even hooked up. It looks like you have everything you need to hook your ignition up properly.

 

[Pin_Head]

The large B/Y wire powers the ignitor and the coil through the ballast resistor. The small B/Y powers the + side of the coil only when the engine is cranking. There are also wires that connect to the distributor and the - side of the coil.

 

[DieselFJ]

Alright, with that I believe I see what needs to be done. Let me run over my thoughts for clarity. I will wire the large b/y wire from the wiring harness to one side of the resistor, then from the other side of the resistor to the large b/y wire connector that shows in one of my pictures of the igniter/coil. The other black wire will plug into the small b/y wire from the harness. With that being said the smaller b/y wire goes into the igniter directly, and the larger b/y wire is one of the two wires connected to the + side of the coil.

Just a side note, I took the cover off the igniter and it looks to be some type of amplifier, is that a correct assumption? Reminds me of a 6.5l PMD.

Thanks