In the interest of the next noob who goes to start their 110 and finds nothing but dash lights and a relay click when they turn the key, the problem could be a loose wire to the top of the starter motor solinoid (behind the exhaust down pipe from the back of the turbo -you don't need to remove it, just the heat shield)
You may need a whole lot of degreaser to actually see anything back there, definitely a small torch either way. And try not to arc up at SWMBO who insists now is a good time to hassle you about driving old cars.
here is a pick of the offender; it's the blade connection with the 'red and white' wire going to it (now brownish in this photo).
I had this problem recently (why is it I seem to have ALL the common problems with my bus? ) with my 300tdi.
The fitting on the wire simply isn't good enough to securely connect to the solenoid fitting. Once oil gets in there its only a matter of time before a intermittent connection issue develops. I replaced it with a better quality female blade connector so hopefully it will not happen in the future...
Same problem many times, i ended up soldering the wire to the terminal on the starter and moving the plug/connection along the wire 20cm, i believe the plug kept losing its tension from the heat from the turbo.
Yeah, it is a weird connection to have on such an exposed and important piece of gear.
The electricals on this car are in a real bad state. 26 years of bodgey addons and chopping and changing have ensure that. Put it this way; I have to physically pull the fuse to turn off the wipers! (the fuse it now a switch, one end in, one end out!)
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