If (by wiring the socket wrongly) I connected the postiive into the negative side of the phone charger, it should still work (shouldn't it?) - it's just that the internal fuse would not be protecting the charger. I'm curious though - what kind of circuit inside the phone could be damaged by reverse polarity? I understand (I think) that the polarity is important if there is a fuse involved - it needs to be on the positive side to be effective. The stamped polarity markings on the cigarette socket terminals are so miniscule as to be almost invisible - I didn't see them and thought it didn't matter which way around (as if wiring a light for example). I didn't think it would make any difference, but It seems that connecting the +/- the wrong way around is damaging the chargers ? Can anybody help explain to me why this is ? Or was it that the voltage was at 14 volts instead of around 12v that did the damage, and it was just co-incidence that it happened when I switched the +/-? I tried a second car phone charger - it worked ok ! Puzzled, I reversed the polarity and tried again - the second charger now didnt work, and continued to not work when I corrected the +/- to the right terminals. I noticed I had connected the +/- terminal at the back of the Cigarette socket incorrectly (wrong way around, the markings on the socket were extremely hard to see) - so I switched them, charger still didnt work. (The voltage was high as the battery charger was running). I've tested all along the circuit with a multimeter, and I was getting approx 14 volts right down to the +/- terminal inside the cigarette socket. the light on the car charger didnt light, and the phone didnt charge).
When I tried a phone charger it didnt work (ie. I wired up a cigarette socket to my batteries (battery to small bus-bar + and -, busbar positive to switch, switch positive to cigarette socket, and cigarette socket back to bus-bar negative terminal).
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