Westerbeke 9.0 BCG Technical Manual page 198

3. When leads are put across the diode, as illustrated,
voltage passes through the diode allowing the
head light to glow brightly.
Hiqh Beam 12 Volt Bulb
Does Not Glow/Is Very Faint
4. Reverse the leads across the diode. The diode should block voltage passing through it and the head light
should not glow, or it may glow faintly.
A. Should the bulb not glow with leads connected in both directions, the diode is open internally.
B.
Should the bulb glow bright with the leads connected in both directions, the diode is shorted internal-
ly.
In both A and B above, the diode should be replaced. Check resistance values of rotating field wind-
ings and the integrity of the posi-resistor connected between field windings.
5. Rotating Field Windings 7.0 - 8.0 ohm. (Readings taken between the two red and white wires connected
to the (
+ )
and (-) terminals of the exciter rotor as shown on the illustration on the previous page.)
6. Posi-Resistor. (Infinite readings between both yellow leads lifted from the (+) and (-) terminals on the ex-
citer rotor.)
C. MAIN STATOR WINDINGS
1 & 2. Main stator windings .20 - .22 ohm
Group 1 - measured between Lead #6 at the AC terminal block and Lead #4 at the junction block. Lift both
leads along with lead #5 at the terminal block to totally isolate group #1.
Group 2 - measured between Lead #3 at the AC terminal block and Lead #1 at the junction block. Lift both
leads along with lead #2 at the terminal block to totally isolate group #2.
NOTE: The
Junction Block
for connections #4 and #1 from the main stator windings and to
the transformer windings is found just below and to the left of the compound transformer.
3. Main Stator Auxiliary Windings 1.5 - 1.8 ohm. (Measured between the double leads on the AC terminal of
the bridge rectifier, unplugged from the rectifier and the double lead central prong connection of the
regulator plug.)
No continuity should be found between either of these three winding groups or to the generator's case.
Westerbeke Generators
192