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Old 09-15-2020, 03:30 PM   #1
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12V DC system shutdown

Help! My RV is a clone of the FR Forester. I was swapping out my converter when my wrench touched the metal case and all my DC power went suddenly dead. I canít find a main fuse or anything that will let it come back to life. The batteries are full (13.15V).

Can anyone help?
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Old 09-15-2020, 04:51 PM   #2
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1st thing..........one should always secure/disconnect/remove ALL power sources PRIOR to making any repairs/swaps etc
Converter has 120VAC going in and 12VDC going out

No 12VDC could be:
*In-line fuse/DC Circuit breaker on battery cable --- close to battery
*Large fuse(s) on the converter...either on DC Dist Panel or backside of converter
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Old 09-15-2020, 05:07 PM   #3
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I read the instructions prior to working on it. No mention of disconnecting either, but I did unplug the shore power. I have always considered 12V safe. That will never happen again!

My batteries are under the top step and with all the solar it's a confusing tangle of wires. I suppose I'll have to trace each wire until I find something.

That is after I run an emergency wire from the batteries to the 12V compressor fridge. .
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Old 09-15-2020, 05:12 PM   #4
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Look for one of these near the house battery. They have a lever that pops out if tripped.

The cable from the battery will be 6 or 8 gauge, smaller then a normal battery cable.

Mine is bolted on the outside of the battery tray, not easy to see.Click image for larger version

Name:	Capture%2B_2020-09-15-19-10-17.jpeg
Views:	7
Size:	55.3 KB
ID:	301169
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Old 09-15-2020, 05:15 PM   #5
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Now you have a wrench with a reminder tattoo on it!

Most of us have had to learn the hard way what Old-Bisquit said.

Listen to the ones that know, it'll save you lots!

Happy Glamping.
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Old 09-15-2020, 08:30 PM   #6
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I still don’t know how it happened, but as soon as I plugged back into shore power everything came back to life. WHEW!!! Thanks for the advice guys. Another lesson learned the hard way. Does it ever end?
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Old 09-16-2020, 11:58 AM   #7
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NOW for the real test............

Unplug shore power and see of you still have 12VDC from battery
Shore power may be supplying DC via converter but w/o shore power battery may NOT if battery fuse is blown
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Old 09-16-2020, 12:51 PM   #8
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Quote:
Originally Posted by twinboat View Post
Look for one of these near the house battery. They have a lever that pops out if tripped.

The cable from the battery will be 6 or 8 gauge, smaller then a normal battery cable.

Mine is bolted on the outside of the battery tray, not easy to see.Attachment 301169
I installed a 12 volt circuit breaker/switch like the one shown in the previous post. It is probably an "after market" addition. I use it as a battery cut-off switch for storage. Your RV may or may not have an identical one. However, your RV probably has a fuse or similar circuit breaker near the battery to protect the wire from the battery to the converter.

I wish you good luck and happy trails ahead!
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Old 09-16-2020, 01:11 PM   #9
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I still donít know how it happened, but as soon as I plugged back into shore power everything came back to life. WHEW!!! Thanks for the advice guys. Another lesson learned the hard way. Does it ever end?
You may be running on the converter/charger and not charging the battery while on shore power.

Pull the plug, switch off the converter, or test the voltage at the batteries to see if that's what's happening. You should see 13+ volts at the battery.
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Old 09-16-2020, 01:24 PM   #10
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Quote:
Originally Posted by okmunky View Post
I read the instructions prior to working on it. No mention of disconnecting either, but I did unplug the shore power. I have always considered 12V safe. That will never happen again!

My batteries are under the top step and with all the solar it's a confusing tangle of wires. I suppose I'll have to trace each wire until I find something.

That is after I run an emergency wire from the batteries to the 12V compressor fridge. .
12 volts has caused many car-b-ques demonstrated by the burned areas on the asphalt.

12 volts can burn a finger off adorned by a gold ring.

12 volts can explode a battery and blind you

12 volts can turn a welding rod into molten metal.

Glad you learned the lesson. No rings or watches. Tools often wrapped in tape. I kept many wrenches and screwdrivers wrapped in tape when working on vehicles for almost 50 years.

Be safe, always remove the negative terminals as well as disconnecting shoreline when messing about.

Ok, you been there done that, got the tee shirt. Welcome to the club.

Be safe out there. Now get off my soap box and exit quietly.
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Old 09-16-2020, 03:13 PM   #11
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12 volts has caused many car-b-ques demonstrated by the burned areas on the asphalt.

12 volts can burn a finger off adorned by a gold ring.

12 volts can explode a battery and blind you

12 volts can turn a welding rod into molten metal.

Glad you learned the lesson. No rings or watches. Tools often wrapped in tape. I kept many wrenches and screwdrivers wrapped in tape when working on vehicles for almost 50 years.

Be safe, always remove the negative terminals as well as disconnecting shoreline when messing about.

Ok, you been there done that, got the tee shirt. Welcome to the club.

Be safe out there. Now get off my soap box and exit quietly.
Back in high school my buddies DAD had to have his gold wedding band cut off at hospital so they could treat his BURN
Wrench in left hand ring touching it..made contact across battery pos & neg post.
It stunk !!
Never could wear a ring again because of the scaring
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Old 09-16-2020, 10:01 PM   #12
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I wish I had asked for suggestions before I started swapping out the converter. My electric tools will be securely taped from now on.

Old Biscuit, I hope you’re healing well. It's good to have you posting regularly again.
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Old 09-16-2020, 10:03 PM   #13
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I wish I had asked for suggestions before I started swapping out the converter. My electric tools will be securely taped from now on.

Old Biscuit, I hope youíre healing well. It's good to have you posting regularly again.
Thanks!
Glad to be posting again
Reversal surgery scheduled for Oct 8th

Did you unplug Shore power and check if you still have 12VDC power?
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Old 09-17-2020, 10:05 AM   #14
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Did you unplug Shore power and check if you still have 12VDC power?
Oh (expletive deleted)! I just did and the 12V including the converter went dead. Back to searching for a fuse.
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