[QUOTE=Nev;3250763]Okay, Explain the surge protection effect of connecting the negative lead to
a piece of chassis which is directly connected to the battery terminal by
a piece of copper wire as opposed to the terminal itself.
The "Connect to Chassis" advice has been around much longer than sensitive
solidstate components and systems in cars.
And as the Doctor writes above, still holds true wrt hydrogen/oxygen and lead-acid
batteries. Although I think the risk is greatly reduced these days.
Remember, petrol station forecourts all have warning signs against
using your mobile whilst filling your tank. That's a fallacy too, but
most people "accept" it's possible that talking on a mobile phone
can cause petrol fumes to ignite. It can't.
I saw Richard Hamond on Braniac put that myth to bed so I love to wind forcourt staff up by talking on my phone when at the pump
some people have no sense of humour
BTW he still managed to blow up a caravan