Since the battery is "currently disconnected" this is an excellent time to check the voltage output of the converter. With NO battery connected, the battery cables from the converter should read 13.6 VDC +/- 0.2 VDC (13.4-13.8 VDC)
If it does, the converter output is OK, but you may still have an issue with the converter not "changing from bulk to absorption mode"...
My guess is that your battery is defective and probably has a shorted cell. That would reduce the battery output voltage by about 2.1 VDC so the battery would read around 10.5 VDC or in that range. You can check it with a voltmeter to confirm.
In theory, if the battery has a shorted cell, with an output of 10.5-11 volts, the converter would "kick into bulk mode" to try to recharge the battery. With the shorted cell, the battery would likely overheat as it simply can't store that much energy.... While in "bulk mode" the converter fan will run continuously.
Long story shortened: Your battery is "burned up" and the converter may also be damaged. Check the converter output, if it's 13.6 VDC, install a new battery and watch it closely.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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