Re: Re: Conversion to Negative Earth

Hi Roger,
Electrons jump better from a hot surface to a cold one than the other way around. The centre electrode is much hotter than the outer one so you won’t get such a good spark if you don’t preserve current direction in the spark plug. So, ideally, if you swap the battery polarity, you should swap the two low voltage connections around on the coil. You don’t need to change the coil. Neither end of the low tension circuit is earthed.
I’d recommend changing to -ve earth – can’t imagine driving around without a satnav these days.
Chris