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chefdc1's avatar
chefdc1
Explorer
Nov 12, 2016

No 12 volt power after disconncting coach battery

I recently disconnected my coach battery to check for water levels and no longer have 12 v power. I forgot to disconnect shore power before doing this. All of the fuses are okay and everything works with shore power or with the generator running. Battery checks out to 12V. Any ideas...I'm stumped.
Also: this is a 1997 Damon Hornet Calss C, there is no battery by pass switch...no inverter. Very simple: 1 12v Battery, converter.

Okay, Red Wire and Black Wire (with fuse in line) are connected to Positive. Green is connected to negative. I had the black (with fuse) connected to negative (I didn't remember where the wire went when I first disconnectd (I know...I'm a bit of an idiot!). Now the panel lights come on showing battery power (tank levels etc), but still no 12v power to lights, pump etc. I rechecked all fuses...no issues.

Battery does not seem to be charging from shore power.

Pleas tell me I did not fry my converter!!
  • First, check that power is present beyond that fuse in the black cable to your battery when properly connected. There may also be a hidden circuit breaker close to the battery. Look for a small can that houses the breaker. It may need resetting.

    As OB states, if you connected 12V backwards, you may have blown the reverse connected protection fuses on the converter.
  • Reverse Polarity FUSES

    They blown when battery is hooked up backwards to PROTECT converter electronics (as explained in other post :B )

    30A/40A fuses on converter..front/side/rear

    With battery cables correctly/verified POS to POS and NEG to NEG then replace those reverse polarity fuses and all good.
    12V DC from battery and converter output to battery for charging

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