Back from shop, now GP's not working!

[Mistel]

In my ongoing saga to get better starting in the cold weather we are having, I took my 85 300TD to the local indy to have the valves adjusted. I also had a block heater installed.

So I pick up my car today and start it up without looking at the GP light. It was a hard start, but it went. I drive home and it seems to run well. I go out later and I see that the GP light is not coming on. I looked at the fuse, it's good. A quick look at the plugs and they seem fine, no obvious loose wires. I imagine that they knocked something loose then they were doing the valves or block heater.

I called them and let them know about the problem, they say they will take a look monday, but if it is something simple I would rather fix it myself and save the hassle of taking the car in.


Any idea what it might be?

It's dark now, I will look at it tommorrow

Thanks