15V from the alternator where ?, on the warning light wire or the main
terminals as well.
If it's the main terminals as well but only 12v at the battery then it
must be a poor and broken connection between the alternator and starter.
Either the power wire or the earthing.
Unless it's an injection engine then there is no diode between the
warning light connection on the alternator and the warning light.
So the warning light will come on with a voltage difference in either
direction.
On injection engines there is a diode so the bulb only lights if the
battery voltage is higher than the alternator voltage.
Which is what you are seeing.
Jim
On 13/07/2018 22:58, Nigel Plant wrote:
Yes, I'm around there. Not had much time today, but did hook voltmeter
up. 15v from alternator, no difference across battery between engine
running and not, around 12.6V indicating a poor connection across
starter. Main battery earth and all auxiliaries cleaned with no
difference. Am favouring Steve's input and will clean/ check all leads
between battery and alternator on Sunday, they are very oily!
The bit I am struggling with is 15v from alternator going to ignition
bulb, why does it light up? Is it because alternator is supplying a
higher voltage to bulb than it receives from battery. So there is a
nett 2.5 v across the bulb. I had always assumed light glowed when
battery voltage was higher than alternator output. Guess it's all
logical unless a diode is present preventing a reverse current.
Some of this is rhetorical haven't really got my thoughts together
yet. Still will get there.
PS Am sorry that me posting this has caused other 2+2's to come out in
sympathy 😀😀
On Fri, 13 Jul 2018, 21:15 'Jamest142' via Quantum Owners Group,
<[email protected]
<mailto:[email protected]>> wrote:
Hi
This is really strange - must be down to the weather... Q2-002
had the same problem, I thought it was the battery, changed it,
then a new alternator. I eventually found thanks to Jim senior
that there is a wire from the battery which goes from the battery
negative to just above the starter motor - clamped by the bell
housing for the clutch - nice thick wire, but totally covered in
oil and crud. When I touched the engine end - it moved. I just
tightened it up again, and the problem seems to have gone away. I
have got a secondary battery earth going to the 'wrong' side of
the clutch bell housing, but this does not seem to have much
effect as it has at least 5 joins before it gets to the alternator.
TTFN
James T
Q2-002
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