Test Ignition Coils; 14 Amp Charging System - Briggs & Stratton Vanguard 430000 User Manual

Test Ignition Coils

The following test will be performed with the meter
in the position.
1. Check coil primary resistance between + and
- terminals (Figure 7).
Figure 7
• Specification: 3.4 Ω - 4.6 Ω
• If ignition coil is not within specification, it
must be replaced.
2. Check coil secondary resistance between +
terminals and spark plug lead (Figure 8).
Figure 8
• Specification: 10.4 Ω - 24.6 Ω
• Check spark plug leads for damage
(brittleness, crack, etc.).
• If ignition coil is not with specification, or
spark plug lead is damaged, it must be
replaced.

14 Amp Charging System

The 14 Amp charging system consists of two
components:
1. The belt driven permanent magnet alternator
produces AC voltage (Figure 9). AC output
will vary with engine RPM, from
approximately 7 volts AC at 1000 RPM to 32
volts AC at 3000 RPM.
• A loose V-belt will cause low AC output.
• Belt deflection limit is 3/8-1/2in/22lb. (10.0-
12.0 mm/10 kg).
Figure 9
2. The regulator-rectifier converts the AC
current to DC and regulates current to the
battery (Figure 10). The charging rate will
vary with engine RPM. The regulator-rectifier
is equipped with a charging indicator light
circuit.
Figure 10
• The regulator-rectifier requires a minimum
battery voltage of 6 volts to function.
There will be NO charging output if the
battery voltage is below 6 volts.
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