QuestionI have tried ordering a complete ignition switch for my 74 TR6. All I can find or those with 4 wire plastic plug or 5 or 7 spuds but not the 9 like on the car.
Can send photos of the one in the car VIN#CF00001641
What is needed is one with 9 spuds only 6 are used.
Wire colors were 1 Open
2 white
3&4 Open
5 brown w/black
6 brown w/red stripe
7 white w/red stripe
8 brown big
9 connected to 8
1
9 2
8 3
7 4
5
6
Numbers on item 30364A or 3672 all I could find
Wire on the cylinder is green w/black stripe but not connected to anything.
AnswerHi Wes,
I don't have any reference numbers of switches. Even though I put many switches in TR-6s over the years I don't remember which ones had which number of connections. Although I have been faced with the same problem on other cars. All you need to do is to take an ohm meter and write down what pin connects to what other pin/s on the new switch then look at your wiring diagram to see where each wire goes.
Stop and think about it! How many switch positions does the switch have? It sure don't have 6 or seven positions does it? It has "OFF","Auxiliary", "ON" and "START".
This means that several of the pins on the switch are connected together. First look at your diagram to ID each wire. (off the top of my head ) I know that the heavy (12 ga.) brown wire is the power into the switch. The white wire is an ignition wire.
There were two basic design switches, one for dash mount on early cars and column lock switches. The dash switch had the pins in a circle and had 7 pins but only 4 connections. (three sets of two pins and one single pin. The column switch also had 7 pins arranged in two rows. Two sets of two in one row and in the other row was a single pin and one double pin.
Some aftermarket switches may have the pins in a different arrangement so it is up to you to take an ohm meter and see which pin is connected to which other pin in the "OFF" position, the "ON","AUXILIARY" and "START". (switches are usually arranged in OFF, AUX, ON and START) Now you have a "Map" of what the switch does in each position. Then go to your wiring diagram and ID each wire by it's color code. So you have what each wire goes too.
With that info you can connect each wire to each pin. After you have the "Map" of what the switch does and the ID of each wire and can't figure out which wire to connect to which pin, send that info to me and I will tell you which wire to connect to which pin.
Most of the time in dealerships we just installed the new switch or electrical component and just plugged it in. But some times we ran into what you have where the pins are different and we had to figure out what the function of each pin was (Map) and get a diagram to see where each wire needed to go.
If you don't have a wiring diagram let me know and I will put one on my web site for you to copy.
Howard
