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 > Got a call from a friend...

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ken56

Tennessee

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Posted: 06/27/20 07:40pm Link  |  Quote  |  Print  |  Notify Moderator

My good friend called me today and told me his 12 volt side of the trailer does not work when he is not plugged into shore power. No lights or refrigerator or anything else 12 volt is getting power from the battery, he must be plugged into shore power for anything to work and all is fine and works normally when plugged in. Any suggestions on what to look for? Its a new battery and he just put in a new converter because it was not charging the battery. Not sure if he hooked it up correctly or if he missed a wire to power the 12 volt from the battery when not on shore power. Any Ideas?

enblethen

Moses Lake, WA

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Posted: 06/27/20 08:03pm Link  |  Quote  |  Print  |  Notify Moderator

Should be a fuse adjacent to the battery on the trailer.
Could also be another battery in the 12 volt DC distribution panel possibly marked BAT


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BB_TX

McKinney, Texas

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Posted: 06/27/20 08:39pm Link  |  Quote  |  Print  |  Notify Moderator

Did he by chance turn the battery disconnect switch?

Or he could installed the battery wired reversed polarity. Happens more often than it should. Will blow the reverse polarity fuses.

enblethen

Moses Lake, WA

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Posted: 06/27/20 09:11pm Link  |  Quote  |  Print  |  Notify Moderator

Reverse polarity fuses are good as the system works when plugged into shore power.

time2roll

Southern California

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Posted: 06/27/20 09:22pm Link  |  Quote  |  Print  |  Notify Moderator

What is the battery voltage right on the terminals?

s/b same as converter voltage or you have an open connection. Find the bad spot and fix it.


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guidry

Texas Cajun

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Posted: 06/28/20 05:12am Link  |  Quote  |  Print  |  Notify Moderator

It’s gotta be the converter if the battery is good. That’s usually what happens when someone plugs into a bad power source and blows the converter.

2112

Texas

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Posted: 06/28/20 05:40am Link  |  Quote  |  Print  |  Notify Moderator

If the battery is good, properly connected, and the battery disconnect switch is not turned off, follow the battery positive cable to look for something like this:

[image]


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wa8yxm

Wherever I happen to park

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Posted: 06/28/20 06:28am Link  |  Quote  |  Print  |  Notify Moderator

I need to boiler plate this
Get an Automotive Test Light (Most any auto place) looks like an old fashing ice pick with a light bulb in the handle and a wire coming out with a clip on it.

Touch clip and tip to battery posts. Bright = GOOD dark either the bulb needs re-seating or battery is dead.

Once you have bright move clip to any unpainted metal frame part (Good ground) and touch battery positive with tip. Bright = Good dark try a different clip point.

Can not find bright.. Negative cable issue check both ends and/or jumper around it for testing. It may need replacement (Bad wire does happen)

Else
Move out along the positive wire.. Every terminal check IF you move the ground clip re-check last point to insure good ground. problem exists between Dark and Bright.


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ken56

Tennessee

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Posted: 06/28/20 07:27am Link  |  Quote  |  Print  |  Notify Moderator

Thanks everyone for the ideas. I made notes to take over. While I'm not an expert here I am also not totally uneducated about 12 volt systems, just though I would ask on here for what to look for. Personally I think its his battery fuse/breaker or possibly corroded connections....his trailer is 8 years old and was purchased used from a dealer and appears to have been stored outside all its life. Thanks again, will update later.

ken56

Tennessee

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Posted: 07/01/20 11:47am Link  |  Quote  |  Print  |  Notify Moderator

It was the 40 amp circuit breaker. We took apart all connections and cleaned the corrosion and replaced the circuit breaker and all is well now.

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