YEP........that is an Old Magnetek 6300 Series Power COnverter (6332)
It does NOT have 'reverse polarity fuses'
It uses an Internal Transfer Relay to 'swap' between converter supply DC power (when AC Power is available) and Battery supply DC power
When functioning properly (as much as it could) it supplies DC and Maintains Battery charge state whenever AC Power is on.
****Could have an IN-LINE Fuse on Battery POS Cable to converter that is blown. Will be close to batteries
You can perform a test if the Internal Transfer Relay....see pg 6 of LINKED Manual
Magnetek 6300 Series Manual AND additional info/troubleshootingDC Section Upgrade for Magnetek 6300 Series
GO with the 45A Upgrade
