Larry, there is a variation between the early 6 cyl cars and the later 6 cyl cars before you get to the dual light system in the BJ8s. You might run into this so I better cover it. My last circuit configuration works on the later 6 cyl cars up to the BJ8. But I then realized that in the very early 6 cyl cars the trafficator did not gets its power from the "B" terminal of the turnsignal flasher. In the early 6 cyl cars the trafficator gets its power directly from the top fuse in the fuse box. In the later 100/6 and the early 3000s they moved this wire for the trafficator down to the "B" terminal of the turnsignal flasher. Probably this was done to minimize the number of wires at the fuse.
So as I drew the circuit in the last drawing when you turn the 3-way switch to the 4-way flasher side it will not de-energize the trafficator on the early 6 cyl cars because the trafficator is not powered off the "B" terminal of the flasher. I was thinking of the later cars when I drew this. With the circuit installed as my last drawing the trafficator could turn on the turnsignals at the same time as the 4-ways are on. This is what I was intending to avoid and is not desirable.
So to remedy this situation on the early 6 cyl cars, just remove the trafficator's power wire from the fuse holder and move it to the "B" terminal of the turnsignal flasher, with it this way when you move the 3-way switch over to the 4-way position it will turn off the trafficator.
Well, one more thing. :rolleye:. As I said earlier this could get complicated but consider that we are almost there. As I have drawn it it will work perfectly fine. But if you step on the brake pedal when the 4-ways are on the brake pedal will feed constant 12v thru terminal 5 on the stop/turn relay into terminals 7 & 3 which will backfeed 12v thru the new relay and into the 4-way flasher. This might cause the 4-way flasher to burn out. But I really don't think so because it will not be adding any current to the circuit. The current load on the flasher will remain at what the four bulbs
at the four corners of the car draw. To remedy any feed back from the brake circuit will take another relay. It will take a relay with a Normally Closed (NC) contact. This NC contact would have the wire from the brake switch going thru it before it gets to terminal #5 on the stop/turn relay. The pull in coil of this final relay would be energized from the 4-way flasher side of the 3-way switch. That way when the 3-way switch is turned to the 4-way flasher side it would open this NC. contact and there-by de-energize terminal #5.
In reality, many relays that you buy for automotive purposes have both N.O. and N.C. contacts built into them. So depending on what relay you buy it may have an extra or an available N.C. contact. I have attached pics of the two schmatics for early 6 cyl cars and later 6 cyl cars. Take note of the difference in how the trafficator gets it's power. You want it to get it's power from the "B" terminal of the TURN SIGNAL FLASHER.
https://www.mouser.com/Electromecha...pfd8OrUZLAy6Fgc9UTZhZIPzzA40xpHYaApZkEALw_wcB
I think we have finally covered everything.