Repairs and Maintenance
Repairs and Maintenance
Repairs and Maintenance
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With incorrect system test readings<br />
A9<br />
Re{erence to A4<br />
{Voltage reading higher than 14.4 volts)<br />
I<br />
/l<br />
'/.-_'<br />
I<br />
Connect voltmeter to D+ <strong>and</strong> B+ on alternator.<br />
Run engine at l5OO rpm.<br />
a. Vollage reading exceeds 0.5 volt ahernator must<br />
be defective <strong>and</strong> should be replaced or repaired.<br />
b. Voltage reading lower than 0.5 volt voltage regulator<br />
should be replaced. Recheck.<br />
At0<br />
Reference to 44<br />
(voltage reading below 13.0 volrs)<br />
of referenoo to a5<br />
(voltage drop more than O.7 voh)<br />
Connect voltmeter to O+ <strong>and</strong> B+ on alterna-<br />
Bun engine at 1500 rpm.<br />
a. Voltage reading exceedsO.5 volt:alternaror must<br />
be defective <strong>and</strong> should be replaced or repaired.<br />
b. Voltage readins below O.5 voh: so ro A11.<br />
Prior ro this test, carefully check that wires from atternator<br />
to voltage regulator are in corect order. No<br />
shons, no grounds, no loose connections.<br />
Atl<br />
Check rotor circuit resistance<br />
I<br />
I<br />
I<br />
I<br />
I I<br />
OlIU.UETEB<br />
Disconnect wire DF (plud at vohage regulator. Use<br />
ohmmetertocheck rotor resistanc€. Correct resistance<br />
is approx.4 ohms. Howevet depending on brush conditlon,<br />
resistances of 4-10 ohms might be considered<br />
Run engine at 1500 rpm.<br />
b.<br />
qoror ressrance checks our coiiect: go to 41r.<br />
Botof resistance checks out lower than approx<br />
i<br />
BLACK WIRE<br />
rolor is orobably defectrve. When reDaiflng. checl<br />
rotor resislance direcrlyon sliprings lo venfytautt.<br />
Rotor r esr$ ance consrderably hrgher than app'ox.<br />
4 ohTs clea' ahernaror brushes <strong>and</strong> shp rings.<br />
10<br />
Gtoup 32
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