Mk1 Control Unit - Ignition Warning Light

[Bakdraft007]

I have spent all afternoon trying to lean exactly how the charging control etc works for a MK1....

Two things are left which I am not sure on.

1. On the 16RA control box...C1, C2, W1, W2 I understand... but what is R for and why does it have what looks like an external resistor (back of the unit) coming from C2 (Alternator output) going to R?
2. On Rimmers page for the Mk1 it shows a Control Unit - Ignition Warning Light relay. This is not shown on the Mk1 circuit diagram, and I do not know where it is meant to be located or what is it for. se the photos below.

11AC Alternator.png

Ignition Lamp.png

Ignition warning lap relay.png

[Bakdraft007]

I have spent all afternoon trying to lean exactly how the charging control etc works for a MK1....

Two things are left which I am not sure on.

1. On the 16RA control box...C1, C2, W1, W2 I understand... but what is R for and why does it have what looks like an external resistor (back of the unit) coming from C2 (Alternator output) going to R?
2. On Rimmers page for the Mk1 it shows a Control Unit - Ignition Warning Light relay. This is not shown on the Mk1 circuit diagram, and I do not know where it is meant to be located or what is it for. se the photos below.

11AC Alternator.png

Ignition Lamp.png

Ignition warning lap relay.png

So, after lots of reading I found something mighty interesting.

I see lots of posts, and articles about people saying if the IGN waring light bulb fails it's a problem because it provides the excitaion current to start the alternator. I even see that suppliers such as Gil at Better car lighting suggesting they have a solution by placing in a resistor..... well... all that is not true.

In my post above I asked what the R terminal and the resistor was for on the 16RA. I now have the answer. Lucas already had figured the bulb could fail preventing the exciatation issue, so thats what the Resistor on the back of the 16RA is. It's a 60 ohm resistor in parralel to the IGN warning ligh bulb, placed there in case the bulb fails. This means there is no need to purchase a resistor for the LED IGN bulb.