TimR wrote
Rod Speed wrote

But in some situations the problem is that the car that wont
start will turn the engine over fine but the voltage sags enough
so that the ignition cant supply a good enough spark to get
the engine to fire and all the car that is helping to start it
needs to do is supply enough voltage to get the engine
to actually fire and that doesnt require much current.

I'm throwing the bull**** flag on this.

Thanks for that completely superfluous proof that you
have always were that terminal a pig ignorant ****wit.

It has always taken more power to turn an engine
over mechanically than to get a spark plug to fire.

Yes, but the difference is that with a flat or sulphated
battery, the engine can still be cranked over, albeit
very slowly, but the battery may well be producing
a much lower than normal voltage that isnt enough
to produce a decent spark to get the engine firing
in the worst weather conditions in a car with an
old well ****ed distributor and plug leads and
spark plugs.