Gravely Promaster 100 Service Manual page 62

Promaster 100 Briggs/Stratton -16 HP
Installation checkout: Make sure that all switches are in
their proper position: PTO switch off, Neutral switches
activated. (T-levers centered).
Step 1:
Check out the battery. Use a hydrometer on all the
battery cells to see if one or more is bad. Also use a
voltmeter to check for proper voltage. Replace the
battery if necessary and/or charge to proper level.
Step 2:
Use a voltmeter to make sure you have power to
terminal B in the off position on the back of the key
switch. If you don't have power to terminal B, check the
25-amp fuse or connection at the start solenoid.
Step 3:
With the key switch in the RUN position see that power
has been transferred to terminals L, and A. Terminal A
supplies power to the relay (pin 86) and on to the seat
switch to activate the holding circuit for the time delay,
and fuel shut off solenoid. Terminal A supplies power to
the hourmeter and oil PSI light, and brings in charge
power from the engine to the battery.
Terminal M grounds the key switch with the unit.
Terminal G provides an additional ground for the kill
circuit of the engine.
Step 4:
With the key in the START position, power is
transferred to terminal S, to the first small stud on the
solenoid, out the other side through the PTO and
neutral switches to ground for starting.
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