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To my mind the fault is inside the emergency flasher switch. To check this you can check is there is 12volt on terminal 49A when the ignition is on and the emergency switch is in the off position. This wire feed current to the indicator switch on the steering colom. The current comes from the fuse on terminal X then thru the contacts inside the switch and out on terminal 49A to the steering colom switch.
If you find the X has 12v and 49A does not have 12v then you will have to replace the emergency switch.
This should answer your question but if you need more assistance please do not hesitate to ask.
The fault is usually inside the flasher switch. Yes the 4 way and indicators do not work from same power point. The emergency flasher switch controls the power to the indicators or the emergency flashers inside the switch.
So you would probably have to replace the switch.
I have found some pictures of a MK 2 GTI Golf.
If this is the correct car and switch then this should help you.
Yes the turn indicator switch is in the steering column. The flasher unit relay is on the fusebox. But to my mind the fault lies with the emergency flasher switch, it is not sending the current thru to the indicator switch. Or the fuse is blown.
The current comes from the fuse to the emergency switch on terminal 15 and out on terminal 49A.
The bulb was causing a cross wiring causing current the to go directly to the earth but with a bad connection is the only thing that I can make of it. Not something that one will be able to think of. Glad you got the problem sorted.