Electrical Systems - Chassis
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9•252
• Check all wiring for burnt or loose electrical connections.
Repair as needed.
• Check all grounds and electrical connections to ensure they are clean
and tight.
a. Alternator ground to chassis frame.
b. Motor block ground to chassis frame.
c. Chassis battery ground to chassis frame.
d. Alternator positive output to isolator center terminal.
• Inspect the alternator for damage. A broken fan blade can damage an
alternator or make it out of balance.
• Check belt, pulley and fan for wear. Replace as needed.
• Never attempt to disconnect the battery or battery wire from the alternator
with the engine running. This can cause damage to the alternator or the
regulator.
• The pulley for the alternator should be torqued to 80 foot pounds.
• Chassis battery voltage with the engine OFF should range from
12.2 to 12.7 VDC.
• Chassis battery voltage with the engine at idle should range 13.5 to
14.2 vdc.
• The output of the alternator range is 13.6 to 15.4 vdc. Connect a volt
meter to the (B+) terminal of the alternator and chassis ground. Idle the
engine up to 1200 rpm.
• Connect a clamp-on amp-meter, if available, to the positive battery cable
to verify the battery state/rate of charge.
Remember the alternator is not a battery charger. It is designed to maintain the
proper operating voltage level for the motorhome. A battery with a low charge, or a
dead battery, may cause damage to the alternator.
WINDSOR
STATE OF
VS
SPECIFIC
CHARGE GRAVITY
100% 1.265
75% 1.225
50% 1.190
25% 1.155
Discharged 1.120
Check Out
Procedure
The distilled water level in battery should be 3/8” below the vent tube.
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