Vacuum Pump Relay
- Using an ohmmeter, check continuity between relay coil terminals with relay not energized. Resistance should be 70 ohms between terminals No. 1 and 2. No continuity should be present between terminals No. 3 and 4. SeeFig 1 .
- Apply battery voltage to terminals No. 1 and 3. Continuity between terminals No. 3 and 4 should be zero ohms.