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Old 12-25-2015, 12:30 PM   #1
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Help no 12 volt power

Merry Christmas! My Christmas gift to the Family was a trip in the RV to San Diego. We're leaving the day after Christmas. Went out this morning and the coach is completely dead. house batteries (4, 6 volts) register 7 amps. Chassis battery registers at 4 amps. I've had the RV(2014 Thor Windsport ) plugged in to 30 amp and always leave it plugged in so they should charged. Trying to get to the converter now to see if a main 12 volt fuse has blown.
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Old 12-25-2015, 01:25 PM   #2
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Quote:
Originally Posted by Giant Jeff View Post
Merry Christmas! My Christmas gift to the Family was a trip in the RV to San Diego. We're leaving the day after Christmas. Went out this morning and the coach is completely dead. house batteries (4, 6 volts) register 7 amps. Chassis battery registers at 4 amps. I've had the RV(2014 Thor Windsport ) plugged in to 30 amp and always leave it plugged in so they should charged. Trying to get to the converter now to see if a main 12 volt fuse has blown.
Giant Jeff
Do you mean the "volts in your house batteries measure at 7V" and the "volts in your chassis battery measure at 4V"?
Mel
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Old 12-25-2015, 01:28 PM   #3
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Yes. I said amps huh.
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Old 12-25-2015, 01:34 PM   #4
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How do I test this.
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Old 12-25-2015, 01:41 PM   #5
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How do I test this.
Use an ohm-meter across the terminals. If it is good, it will show no or minimal resistance. If it's blown, it will show open.

When you had it plugged into shore power, did you have your 12v shutoff turned on? Some coaches have to be turned on to charge. Your chassis batteries don't necessarily charge when on shore power. Not all coaches have a charger for them, but a Trik-L-Start is an easy addition to keep the chassis batteries charged.
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Old 12-25-2015, 01:43 PM   #6
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Compare volts at the input and at the output. They should always be the same. Any voltage drop is a sign of failure. New one at Amazon:

Amazon.com: Bussmann (CB185-100) 100 Amp Type III Circuit Breaker: Car Electronics

You can always use a jumper cable across the CB for testing the converter. With shore or generator power connected, the voltage at the batteries should go above 13 volts as soon as AC power is available.
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Old 12-25-2015, 03:29 PM   #7
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Quote:
Originally Posted by Giant Jeff View Post
Merry Christmas! My Christmas gift to the Family was a trip in the RV to San Diego. We're leaving the day after Christmas. Went out this morning and the coach is completely dead. house batteries (4, 6 volts) register 7 amps. Chassis battery registers at 4 amps. I've had the RV(2014 Thor Windsport ) plugged in to 30 amp and always leave it plugged in so they should charged. Trying to get to the converter now to see if a main 12 volt fuse has blown.
Quote:
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Giant Jeff
Do you mean the "volts in your house batteries measure at 7V" and the "volts in your chassis battery measure at 4V"?
Mel
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Quote:
Originally Posted by Giant Jeff View Post
Yes. I said amps huh.
Giant Jeff
Thanks
Because you did mean amps, (not volts), I am curios what those readings are telling you?
Mel
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Old 12-25-2015, 04:45 PM   #8
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When you had it plugged into shore power, did you have your 12v shutoff turned on? Some coaches have to be turned on to charge. Your chassis batteries don't necessarily charge when on shore power. Not all coaches have a charger for them, but a Trik-L-Start is an easy addition to keep the chassis batteries charged.

Lt. Dan that may be what I have done. I just recentlystarted leaving the coach plugged in and I think I may have left the 12 volt disconnected.
I was able to jump start the coach and both the chassis and house batteries are getting charge from the alternator. I think I'm Ok.
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