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9-9 PRIMARY EXCITING CIRCUIT
As described
m 5-3 DESCRIPTION of GENERATOR OP-
ERATION.
the primary exiting coil is in the magneto
mounted on the engine. and the AVR has a circuit for it.
9-9-l EXCITING COIL
The normal inter-terminal reststance of the exciting coil is
about 10 to 30 ohms. Its voltage at the rated rpm is about
AC 10 to 3OV. Check the resistance and voltage with a test-
er to see if they meet these requirements.
9-9-2 OTHERS
30 output voltage from the genzrator.
Fig. 9- 72
If the trouble cannot be dztected by Step 9-9- 1 above.
shsck the primary exciting circuit as follows:
.I\. Disconnect the control box and opersts thr gsnerator at the rated rpm. Dixonn2:t th2 tRo k-2liow Lv-ires from th2 exit-
ing cot] to the XVR. and momentarily- ;onntlc‘t th2 positive i-i.1 an3 negatiw t -1 Isads of a 13’ batter>- m their ~1x2. Ii
no output voltag2 is generated. reconnect th2 battzr>- Gads th2 oth2r a-a!.
Ii output l-oitage 1s gen2rated. th2 232iting
2oi! IS def22tive.
R. If no output voltage is generated by the test conducted as described in Step A.. operate the generator at the rated rpm and
momentarily connect a 1ZV battzrk- to th2 brush2s. Th2 green I2ad is posrtil2 (+.I and th2 black or brown lead n2gatne
(--I (Se2 Fig. 9-13.). If output I-oltag:. is gsnerated. the p:imdr~- exiting
ci:.xlt I~I th2 XL-R 1s def2ctive. R2nlac2 the
AVR
Fig. 9- 73
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