Well, after changing the glow plugs and fixing the leak in the diesel pump, the car ran fine for a couple of weeks.

Then it quit glowing, and needed half a minute of churning in the middle of summer to get startet. The glow plug light would light up as normal for about two seconds, then start blinking. No voltage on the bus bar, 12,7 v beneath the glow plug relay. Relay clicking as usual on startup.

I pulled out the 50A fuse to check it. After the mechanic fixed the glow-system last time, he shorted the fuse with a standard screw. The fuse with the screw looked just fine, but felt hot to the touch. I put the fuse back in, and for some reason, the car now started just fine a couple of times, before reverting to hard to start and blinking glow plug indicator. I immediately after trid to pull the fuse again, to redo the trick, but it was now so hot, I could not bear to touch it. After a little while, I reinstalled the glow plug fuse, and the car started as normal again.

Two days after that, the brake warning-light would come and go at odd times, with no relation to braking.

No error codes, but there is no sensory for the engine on this model. Only ABS, airbag and immobilizer. Immobilizer reports faulty wiring, though.

Any ideas?