Arctic Cat Panther 1974 Manual page 101

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VVIRING CIRCUIT TESTING
Check Voltage Regulator
Equ i pment Necessary: Electro-Specialties
Voltmeter Model No. MS-10 and Quik Jack
1. Connect the main wiring harness connector to
the engine connector plug.
2. Disconnect the voltage regulator yellow wire
from the AC termina l on the circuit board,
Fig.IV-28.
Fig.IV·28
A.C - DC.
\IOttmeter
3. Raise the rear of the snowmobile off the shop
floor, using a Quik Jack. Make sure the track
is free to rotate.
4. Connect one lead of the AC voltmeter to an
empty AC terminal on the circuit board, and
the other lead to a GROUND terminal on the
circuit board, Fig. IV·28.
5. Start the engine and allow it to idle rapidly.
The voltmeter is to register approximately
12-15 AC volts. G rasp the th rottle and
accelerate slightly. As the engine RPM
increase, the voltmeter is to register 20-30 AC
volts.
CAUTION
Make sure the AC voltmeter has the capacity to
test in excess of 30 AC volts. High engine RPM
can cause high voltage and, as a result, damage
on·line components (AC voltmeter,
etc.).
6. If the voltmeter registers 12-15 AC volts at
engine idle and 20-30 AC volts when engine is
accelerated sl ightly, adequate power is getting
to the circuit board. Proceed to step 7. If the
voltmeter does not register 12-15 AC volts at
engine idle and 20-30 AC volts when engine is
accelerated, there is a problem in the two
magneto alternator wIring circuit wires,
between the engine connector block and
circuit board.
7. With the engine at idle and the AC voltmeter
leads connected to AC and GROUND on
circuit board (see step 4), connect the voltage
regulator yellow wire to AC terminal on
circuit board. Voltmeter is to register 12-15
AC volts at idle and when engine is accel-
erated.
Fig.IV·29
r - - - - ____
' \ ' 5 10 15
1,/
,'\11\1
1
' 1 "1"
o "
A.C- D.C.
8. If voltmeter registers 12·15 AC volts, the
voltage regulator is operating properly and
indicates there may be a problem in the
circuit breaker (see step 9) . If voltmeter does
not register 12-15 AC volts, the voltage
regulator is defective and is to be replaced.
9. Connect one lead of the voltmeter to
GROUND on the circuit board and the other
lead to circuit breaker terminal, Fig. IV-29.
Voltmeter is to register 12·15 AC volts. If
voltmeter registers 12-15 volts, check the
opposite circuit breaker terminal; it also is to
have 12-15,AC volts. If either circuit breaker
terminal does not have 12-15 volts, the circuit
breaker is defective and constitutes circuit
board replacement.
IV·17