Vacuum Pump Relay
- Using a DVOM, check continuity between relay coil terminals with relay not energized. Resistance should be 70 ohms between terminals No. 1 and 2. DVOM should show infinity between terminals No. 3 and 4. SeeFig 1 .
- Apply battery voltage to terminals No. 1 and 2. DVOM should read continuity between terminals No. 3 and 4.