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It's still an interesting thread cos it's one of these things that everyone thinks they know about -but more info the better! I've always been a bit paranoid about 'spikes' and wrecking expensive stuff, so it's nice to know it's probably an unlikely scenario..
Considering how any half-decent AC-DC convert is built, I have trouble seeing how the DC part can go anywhere at all.
Except if you are using some really bad design. Hell, a single diode with a safe low breakdown voltage will prevent it (just as it is done in the Motronic ECU).
Plus, even in the worst case scenario - Motronic has a diode that dies if it's overvolted. Replace that and it's like new again.
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Alright, that is good to know.
The CTEKs have a protection circuit that allows it to be connected w/o fear of spikes. One can also plug in a surge protector before the charger if so inclined.
One thing that can cause damage is use of jumper cables. Newer jumper cables often have varistors built in to protect against spikes. I checked out such as set of cables once and found that they were assembled rather sloppy, one of the ends of one of the varistors wasn't even connected to the lead, so these can provide a false sense of security.
I bought two varistors for essentially nothing at the electronics store and attached these to a set of old jumper cables.
1995 RS2 on Alcohol (6.8sec 100-200km/h)
1994 80E Avant
1986 2L Golf 2 on Alcohol
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