Veris Technologies MSP EC and pH (1997-2008 floppy disk drive 1.02E) - Operating Instructions - Manual (Page 53)

Veris Technologies
Pub. #OM MSP03-1
53
Figure 3: Using voltmeter to check voltage at External Controller power supply
If voltage at power connector drops below 12 volts during this test:
a) clean battery terminals
b) check disconnect contacts
c) hook power leads directly to battery—not through tractor power port
d) charge battery
4. Check voltage at power cable (Figure 4). If 12V at cable but not on circuit board—call Veris
Service Dept.
Figure 4: Using voltmeter to check voltage at power supply cable