Electrics

[racerrad8]

No problem, but maybe it would be better here. That way if the question comes up later down the road the answer will be there for the next guy.

Randy - RPM

[softailfun]

So as can be seen from the post, I had a problem to solve with my FJ electrics. Fortunately Randy saw my problem/Thread and sent this diagram. It made sense apart from a couple of things and Randy was good   enough to answer these. In fairness to Randy he wanted to continue the conversation in the forum so all could see what was being said. I didn't want to lol. However I gave my word that I would copy what he had to say into the forum so that anyone in the future would have access to the questions I had.

So here it is, Thanks Randy!

Okay, this system will have zero safety feature. The bike will start in gear and if the kickstand is down.
The top is the CDI
The three terminal box is the vacuum advance which is not required to make it run. We do not use them on the race car.
The safety switches are all grounding switches. If a switch is open (kickstand down) the starter solenoid (relay) will not activate. If the starter relay is grounded eliminating all of the safety's then the soleniod will engage the starter.
We call "earth" in the US as ground. Ground is the black arrows. The red wire is the 12v positive wiring that powers everything.

I was confused about, what appeared to be two boxes at the top left of the diagram. I asked randy about these and the answer was simple. On looking again it can be seen from the drawing that these "boxes" are indeed 1 unit

That is the standard ignition box. It has 6 pins in one plug and four in the other.
On the "6 prong plug" You are going to have the 12v input, two ground connections and one coil connection to each coil
The four prong plug is only going to use the two input wires from the crankshaft pick-up coil.
The only relay in the system is listed as the starter solenoid.
Randy

[red]

Here is the minimum wiring to make an FJ run. This is how we wire our race cars.
Randy - RPM

Randy,

1,2,IGN,3 - is that the stock ignition switch?
What is MAS?

Thanks,
Red

[FJmonkey]

I am guessing that is the MASter ignition switch since it is part of the power circuit. Good idea to be able to cut the power off.

[racerrad8]

Randy,

1,2,IGN,3 - is that the stock ignition switch?
What is MAS?

Thanks,
Red

1,2 & 3 are auxiliary switches to run fans, lap timer, rear running light etc.
IGN is the ignition switch.

All of those a re just single pole toggle switches.

MAS is the main master battery switch to disable to complete electrical system in the event of a major crash.

Randy - RPM

[softailfun]

Randy,

1,2,IGN,3 - is that the stock ignition switch?
What is MAS?

Thanks,
Red

1,2 & 3 are auxiliary switches to run fans, lap timer, rear running light etc.
IGN is the ignition switch.

All of those a re just single pole toggle switches.

MAS is the main master battery switch to disable to complete electrical system in the event of a major crash.

Randy - RPM

Totally misread that. Thanks Randy.

[TomJK]

Hi Randy

I got a Igniterbox from a newer type FJ, can I swap that with my 3CV type, plugs are identical...

Cheers, Tom.

Here is the minimum wiring to make an FJ run. This is how we wire our race cars.

Randy - RPM

Hi Randy, thank you so much for the diagram. You have no idea how much I appreciate your help. There are a couple of things I just need you to clarify if you wouldn't mind. Do you mind if I pm?

[RPM - Robert]

Depends on what years you are trying to bridge, the rotor and pickup are different for some of the years and I do not believe will work.

[TomJK]

Hi
I've got an FJ from1989, the ignitorbox is from an FJ from1991. Hitachi 3SK=01 is on the box.
Cheers, Tom.

[RPM - Robert]

At least for the US models the pickup and rotor are the same for 89 & 91.

So the box should interchange to get it running. However, I don't know if the pins are all pinned out the same. So you will need to confirm all the wires are in the same spot or risk letting the smoke out.

[TomJK]

Thanks, will look for it in service manual...