Series III Bad earth now fixed, thanks for the advice - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
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post #1 of 1 (permalink) Old 03-30-05, 08:03 AM
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Series III Bad earth now fixed, thanks for the advice

Thanks to the people who correctly identified the electrical problem on my
SIII as a bad earth.
If your're interested here are the symptoms and my fix.

Leading up to the electrical failier, the starter motor turned slowly; we
suspected a bad battery. There was always a feint smell of something hot
after starting.
One morning the starter motor turned a couple of times then stopped. With
the ignition on, I was getting the usual charging and oil pressure lights.
However trying to use _any_ electrical component killed the entire vehicle
electrics - nothing worked, no lights on anywhere. After a few seconds it
seemed to recover to it's nornal ignition on state.

I first replaced the chassis to engine earth strap. All the vehicle
electrics worked and the starter motor turned. However it still laboured,
and I noticed a single clip on the air filter was glowing red hot as it
turned over. I guess between the battery-to-chassis connection and the new
chassis-to-engine connection it was encountering very high resisitance.
Somewhere round the air filter it found an alternative route to earth.
Next I added an extra earth strap from the main battery-to-chassis point to
a handy plate securing the oil filler tube to the side of the block, it even
has a pre-drilled bolt hole.
With the extra earth it is perfect. The starter turns faster and with more
effect than I had ever drempt it could, and the glow plugs heat the
combustion chambers in record time. The old SIII is now very easy to start
(we recently fitted Paddocks parallele Glowstart plugs, these are a vast
improvement on the old coil plugs but might have caused the earth failier?)
Hope this is of help to anyone with similar problems to me.

Thanks again for the advice.

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