Brand new battery dead in 5 days of use...

[wavemaster]

Got my brand 'new' (to me) 1975 Ambassador sitting on my driveway with 110V connected. The battery condition on the panel has shown 'average' at best. The voltage at the battery (when connected) showed 12.7 V.
Ater 4 days I notice that the overhead/exterior lights no longer work. None of the fuses were blown, and the voltage at the battery is 0V.

It appears that the charger is not working, anything I should check?

What is going on, I am at a loss...

Thanks in advance.

Robert

[thecatsandi]

If the trailer is plugged in 110 and you only have 12.7 volts then the converter is not putting out. It should be around 14 V.
Check the Converter breaker/fuse and the output of the converter. It should be fused as well. If both are ok then it is shot.

[overlander63]

You may have a switch to turn off the converter (OEM was known as a Univolt), to keep the loud HUMMMMM from driving you insane while trying to sleep. It could be simply turned off. Try plugging in the trailer, and turning on all switches while watching your battery condition meter. If it suddenly comes to life, you have found your problem.
If not, there is a 50 amp + fuse as well as a 50 amp - fuse (to ground). If either of these are blown, you will have no joy with the converter.

[Ganglin]

Also , check for a line fuse right at the the battery cable where the hot line connects to the batery - our 71 has a fuse there too.

[wavemaster]

Nothing from the convertor, so that was easy to find.

This trailer is permanently attached to 110V, do I really need to replace the convertor? None of the 12V lights work, but other than that is seems fully functional.

Any suggestions?

Robert

[overlander63]

Originally Posted by wavemaster

Nothing from the convertor, so that was easy to find.

This trailer is permanently attached to 110V, do I really need to replace the convertor? None of the 12V lights work, but other than that is seems fully functional.

Any suggestions?

Robert

Since almost everything is designed to work with 12 volts, you will need to replace the converter. I would put an on-off switch to it, if you aren't going to be in the coach for a week at a time, you can switch it off. If you don't have an LP detector, or CO detector, the battery won't go dead in a week. It will save your electric bill as well as allowing the new converter to last longer.