1991 Chevrolet R3500 Cheyenne, B+ Waveform

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Posted to the Waveform Library on 11/9/2002

Channel A is voltage.

Channel B is current. Probe set to 100mv/amp.

Current is measured at ground wire from fender to battery negative post.

Decreasing voltage and current is from operating he blower switch from high,to medium then low speed.

Vehicle Data

1991 Chevrolet R3500 Cheyenne 5.7L

Engine	5.7 L / 8 cyl / GAS
Trans	4-speed AutomaticTransmission (Electronic)
Delivery	Fuel Injection
Subsystem	Not Applicable
Component	B+
Condition	Known Good

References

TECH: Low Battery Hurts Starter?
HVAC: High Blower Current on 1979 Cadillac

Vehicle Data

1991 Chevrolet R3500 Cheyenne 5.7L

Engine	5.7 L / 8 cyl / GAS
Trans	4-speed AutomaticTransmission (Electronic)
Delivery	Fuel Injection
Subsystem	Not Applicable
Component	B+
Condition	Known Good

References

TECH: Low Battery Hurts Starter?
HVAC: High Blower Current on 1979 Cadillac