BATTERY CHARGING AND STARTING SYSTEMS
90-826883R2 JUNE 1998 Page 2B-7
Voltage Regulator Test
Lamps Burn Out When Engine RPM is Increased
The voltage regulator is defective. Replace regulator.
Lamps Burn Dim at Wide-Open-Throttle
1. Run engine at mid-range (approximately 3000 RPM) with 3 number 94 lamps con-
nected to voltage regulator output leads. Note lamp brightness.
2. Disconnect the leads at one terminal of regulator. Connect the leads together using
a screw and nut. Isolate (tape) connection.
3. Run engine at mid-range (approximately 3000 RPM) and note lamp brightness. If
lamps are considerably brighterthan with leads connectedtoregulator, the regulator
is defective. If lamps are NOT considerably brighter, check the alternator (refer to “
Alternator Test” , following.
Battery Charging System
Description
Thebatterychargingsystemcomponentsarethealternator,rectifierandbattery.Alternat-
ing current (generated in alternator coils) flows to the rectifier which changes ACcurrent
to direct current (DC) for charging the battery.
c
a
b
a - Alternator
b - Rectifier
c - Battery
The charging system may be damaged by:
a. Reversed battery cables.
b. Running the engine with battery cables disconnected and alternator leads con-
nected to rectifier.
c. An open circuit -- such as a broken wire or loose connection.
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