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Join Date: Oct 2006
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Have never tried repairing mine. Previous owners tried unsucessfully to do so through local/private electronics shops here. They eventually sent back to Alpina for new units.
So, some background from when I came into the picture and took ownership:
I have two boxes and two pickups for this car. Not positive which pieces were on the car last, but when they were taken off it was working, albeit with intermittent problems (also described by p.o. as being high rpm and heat related). Without another working car or known good parts to swap out, previous mechanics felt unable to diagnose the system and so yanked and replaced it completely (they did so fairly delicately, so it can all be plugged back in). I suspect, given that the issues were intermittent, etc, that one problem was various wiring/ground faults around the system. My hope was that if I refreshed the wiring harness and plugged everything back in, it just might work.
Both of my crank triggers/senders look physically damaged, though. I never did get any good advice here, from Alpina, or elsewhere about how to determine if either of them are still functioning properly, or if a replacement could be sourced. Bear that in mind as you troubleshoot yours - crank triggers are NLA from Alpina. And let me know if you have a good electronics guy that can figure out how to source a replacement.
The mechanic that had previously worked on the car decided that the magnets in the flywheel were likely the problem and, as replacement flywheels were also NLA, ditched the whole system.
I tend to disagree with his analysis, although I suspect he may have been on the right track. The damage to the sensors suggests to me that the gap was incorrect. Could you pop the front cover and see on your car what the air gap between the sensor and the flywheel teeth is? Also, a picture of the mounting bracket for the sender would be extremely helpful. That’s the one part from the system that is missing. Perhaps it’s been missing for a long time, hence the mismounted sensor, intermittent hot/high rpm issues from the wrong air gap, and resulting damage from hitting the flywheel teeth.
The more I research, the more I think I’m just going to put on an aftermarket modern crank-fired ignition system (the car’s running on an MSD and 635 dizzy right now). I’ve got a couple of TecII units that, particularly if I can use them with the original coils, would provide an almost invisible upgrade. The hartig system, while very simple, is starting to look unmaintainable. There’s current stuff out that does the exact same thing, just in a different box.