You're OK.
Most instruments (VDO/Mitchell) read zero (or high ohms) open and pegged
(low ohms) or shorted to ground. Depends on the sender. Most engine
instruments use a resister that sends 5 volts to the sender wire. They
read the differential voltage through the sender to ground. Ground the
sender wire and it should read zero. Fuel senders are an odd sort,
depends on the manufacturer, type (resistive or capacitance).
Bud Yerly
----- Original Message -----
From: mike gamble<mailto:mp.gamble@tiscali.co.uk>
To: Europa-List@Matronics.Com<mailto:Europa-List@Matronics.Com>
Sent: Wednesday, August 19, 2009 3:53 PM
Subject: Europa-List: Panel Testing
Checking my panel on the bench before installation.
Powered up with 12V and before switching off in a panic, I observed a
rise on the voltmeter which I expected but also a rise on the fuel
gauge, the oil pressure and at least one of the temp gauges .
What should I expect the standard rotax engine instruments to read if
their sensors are not connected? Have I wrecked them already?
Reassurance needed.
Thanks
Mike Gamble
XS 440
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