FT450 Ground Bolt Test
2
REV MAY 2008 FT450 GROUND BOLT TEST
Installation
This procedure is for the test of a FT450 ground bolt using a Digital
Volt-Ohm-Meter.
1. Step 1: Select a Digital Volt-Ohm-Meter capable of testing diodes.
This can be determined by the presents of a diode symbol on the
meters scale selection knob. The diode symbol looks like Fig 1.
2. The ground bolt contains a diode with the Anode (+) connected to
the bolt and the Cathode (-) connected to the green wire.
3. Turn the scale selection knob of your digital Volt-Ohm-Meter to the
diode symbol. On certain models you may also need to press a
(function) button to select the diode test function.
4. Touch the RED Digital Volt-Ohm-Meter lead to the ground bolt
threaded body (if on tanker
– connect RED to PIN 10). Then at the
same time, touch the BLACK lead to the green wire (if on tanker
–
connect BLACK to PIN 9).
5. You should have a reading on the Digital Volt-Ohm-Meter of .485
to .700 volts. If the meter reads outside this range the ground bolt is
defective.
6. Now switch the leads so the RED Digital Volt-Ohm-Meter lead is
on the GREEN wire (if on tanker
– connect RED to PIN 9) and the
BLACK lead is on the ground bolt threaded body (if on tanker
–
connect BLACK to PIN 10).
7. The Digital Volt-Ohm-Meter should now read OPEN or OF which
indicates an open circuit or very high resistance. You may need to
consult the meter instruction manual to determine the proper
indication for an open circuit. If the meter shows conductivity, then
the bolt is defective.