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Hi,
@NickCats - Maybe my aversion to charging through the wiring harness stems from owning so many Italian and English sportscars through the years. Overly cautious? Maybe...
There could be several issues with charging through the cigarette lighter. First, one is merely speculating that the Battery is run down for lack of use (maybe even good speculation and correct 99% of the time) and not due to some short in the Wiring Harness or such. Second, should the charger fail, or succumb to a power spike from the household current (not at all uncommon as most Computer and Top-end Stereophiles know), the wiring harness is directly involved and potentially some very spendy electronic components as well. Also, you work the charger harder having to push that current through all the wiring.
The Porsche Charger isn't made by Porsche, or even to their specifications, it is actually made by a Swedish Firm - CTEK and merely labled as the Porsche Charge-O-Mat II. In actuality, it's just a re-labled MULTI XS 3600 model. CTEK makes good stuff, but it's in no way Porsche specific, aside from the label.
To me, there is little convenience over popping the hood and attaching the leads directly to the Battery.
You may well never have an issue in the wiring harness due to using this charger, I'm not saying that you will. But, I know I won't have one because I don't use the wiring harness to charge the Battery. I'm not saying one shouldn't buy the through-the-lighter type charger, not at all. But that's far from actually recommending them...
Happy Motoring!... Jim'99
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