The PCM controls the ground. It is pulsed (duty cycle) so you can't measure it with a VOM. If you have a dwell meter you can get a reading that way. At idle it should be about 70%.
What is the symptom you are trying to correct? The connections can fail, usually right at the plug. The most common failure is a sluggish solenoid.
The Constitution needs to be re-read, not re-written!
If you can't handle Dr. Seuss, how will you handle real life?
Current oil burners: MB GLK250 BlueTEC, John Deere X758
New ride: MB GLS450 - most stately
Gone but not forgotten: '87 F350 7.3, '93 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6, '90 MB 350SDL, Kubota 7510