ProgressiveRC PM3-75 - Manual (Page 4)

If the converter output voltage reads in the 13.6 Vdc range and the
battery is not charging, check for:
- an open inline fuse in the battery wire (if provided)
- an open wire between the converter and the RV battery
- loose ground
- improper torques
If the converter fuses and AC voltage are good, but the converter
output still reads zero volts, the converter is not functioning
properly.
WF-9800 Series Troubleshooting
Before the converter output voltage can be checked, it is necessary to
disconnect both DC output wires from the converter (as shown below).
Use a 5/16 hex driver to disconnect the wires. Cover each wire with
electrical tape to prevent shorts. Plug the converter into a 120 VAC
source. Using a voltmeter, check the converter output voltage.
Place the Positive + (red) probe in the POS + output (red) and place
the Negative- (black) test probe into the NEG- (black) output terminal
of converter. Be sure you have good connections at the terminals. If the
voltage reads 13.6 Vdc (+/- 0.2 volts), the converter is functioning
properly.
GENERAL COMPLIANCE INFORMATION
The PM3 Series units are UL-Listed, and cUL-Listed
(Canadian). They comply with FCC Class B requirement (see
below)
FCC Compliance Class B
NOTE: This equipment has been tested and found to comply with
the limits for a Class B digital device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment
in a residential area is likely to cause harmful interference in which
case the user will be required to correct the interference at his own
expense.