On 2017-05-08, David Lesher wrote:
"DoN. Nichols" writes:


Some -- but the worst was when I installed a current shunt in
series with the battery to the fuse block. There was an easy place to
mount it -- a shelf on the right side just in front of the firewall. (I
was using some aircraft instruments as displays, plus a 24-hour wind-up
aircraft clock on a secondary panel -- removable so a passenger could
fit in the seat.

It was fine until I hit a vigorous bump, and the bonnet (US
hood) prop rod fell down and shorted the load side of the shunt to
ground. That stopped the car rather rapidly. :-)

That's your fault, Don. You should have had the shunt in the ground side.

Well ... the ground connection was from the battery to the
chassis, and included the starter current. What I was metering were the
things controlled by instrument panel switches (ignition -- *not*
starter current, headlamps, instrument panel lamps, turn signals, and
not much else. Those were grounded everywhere to the nearest chassis
point, an d hard to put the shunt in that side without including the
starter motor.

So -- it was more my fault for not protecting the shunt from
moving parts of the car (e.g. the bonnet prop rod. :-)

As for SU fuel pumps, they were designed to save fuel. The car on the side
of theroad uses none....

They do that, for sure. :-)

Enjoy,
DoN.

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