vw golf 1988, no current from ignition coil?

[Nelson]

I have golf 1.3, 1988.
Causing me trouble is an intermittent fault with the engine spark.
I could be driving along and suddenly the engine will stop, other times it wont start in the morning when it cold, sometimes I could stop the car for five mins when the engine is hot and it may not start again. Neither does it matter if the weather is wet or dry.
When it's working it starts first time.

I suspect there is no current getting to the ignition coil,

When this happens I disconnect the HT lead from the distributor and earth that end of the lead to the engine block.
I leave the other end connected to the coil and turn the ignition key to see if there is a spark produced by the coil. (Note I don't turn the engine over I just turn the ignition on and off) to see if there is any current coming from the coil.
Usually I will try this 4 or 5 times then I will see a spark, when I do see a spark then I reconnect the HT lead and the car will start first time.
But now I cant get any spark from the coil!

I have changed these parts individually to find out what the problem could be.
The (ignition coil, the ignition switch, and the ignition module) (the one near to the windscreen motor).
I have also cleaned all the earths I can find.

Sometime there is no problem for 2 or 3 days and suddenly its back again.
There doesn't seem to be any current getting to the coil, although I haven't tested it
(I have no testing equipment) But the coil should produce a spark is its earthed and the ignition is switched on right?
Does anyone else have an idea; has anyone else had a similar problem and solved it?

[Nelson]

Well I see noone replied to this question, but I thought I would help others by saying the problem is fixed now, it was the hall sender.