Red_bull

Hello guys,

I read somewhere (i think the old Fast Ford tech articles) that it is a good idea to check if you are still getting 12V onto your ignition coil. So i did it with a multimeter measuring 2.? volt and then realised that probably is right as the coil is not always charging. Is it possible to check with a multimeter or will i need a scope for it?

Or am i making a thinking mistake somewhere!

Cossie Sean

you should have 12v to the + side of the coil with ign on (battery voltage)

if im not wrong!

haz87

You want to test it under load conditions as well not idle

martysmartie

iTrader: (1)

You are...

There is a permanent feed going to one side, which should be +12V (will be more than this with engine running) it is the ground side that is switched which is what causes a 'collapse'

So yes, if you have 2V something is very wrong, you sure you were measuring it correctly

There is an exception to this and that is where 'ballast' ignition is fitted, which you don't.

Martin

Red_bull

I measured ground on the coil too. I need to take a different ground point isn't it?

martysmartie

iTrader: (1)

You can do that, the other side of the coil is the ground.

Martin

Karlos G

iTrader: (4)

Yes.
No you can't! lol

The ground is pulsed to control the spark timing, you must use another ground (battery terminal, body, etc.)

James @ M Developments.

iTrader: (2)

Measure from the positive side of the coil to the cars body ground with a multimeter,,and ideally it should be very close to battery voltage. especially important to measure under heavy load

The negative side is a pulse from the trigger source.

martysmartie

iTrader: (1)

It is a ground when the engine is stationary, by doing this it proves it has a good ground(which is very common on the ERST!), the other test proves there is a good supply.

Martin

Red_bull

Thanks for the replies i understood my thinking mistake!