GM Service Manual Online
For 1990-2009 cars only
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Figure 1:

Ignition I Voltage and 12-Volt Reference
Object Number: 2065107 Size: FS
Figure 2:

Ignition II/III Voltage
Object Number: 2065109 Size: FS
Figure 3:

Ignition III Voltage and Accessory Voltage
Object Number: 2065111 Size: FS