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Chrs - 06 Jan 2008 20:13 GMT

Starter motor, earth strap.that two things i acn think off.

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Bob Minchin - 06 Jan 2008 20:18 GMT

> Starter motor, earth strap.that two things i acn think off.

I had a battery once that did this. Seemed to be a bad connection
inside. When it was OK it would crank the engine with gusto and then it
get the hump and would not go at all.

I doubt if it is the starter otherwise the dash lights would not go out.

A meter directly on the battery terminals should show what is going on.

I'd suspect the earth strap first.

Bob

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G.T - 06 Jan 2008 22:47 GMT

Hi,

> I had a battery once that did this. Seemed to be a bad connection
> inside. When it was OK it would crank the engine with gusto and then it
> get the hump and would not go at all.

Could well be a broken element or connection inside as well. According to my
usual mechanic, it's pretty usual indeed (less lead inside, weight and cost
reduction too).

> A meter directly on the battery terminals should show what is going on.

Right method for diagnostics to me. The voltage, in case of a broken
element, is almost OK (12,xx V) when engine is off, and drops under 10V, I
mean far under 10V (perhaps just 8) under start.
The earth lead is an idea too... We should be careful with these things more
often indeed, as it's almost nothing to do but hangs you on the side of the
road anyway.

Regards,
--
G.T

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