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Open Roads Forum  >  Truck Campers

 > Camper batt power not back on after disconnect shore power

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desertroad

Borrego Springs

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Posted: 07/20/20 01:28pm Link  |  Quote  |  Print  |  Notify Moderator

Hi All,

I'm puzzled after I disconnected from shore power and the battery power didn't come back on. Several positive connections go directly to the battery such as the radio, kitchen, and lighting. All are out. When the truck is running, the power is also restored only if running. Checked the 3 fuses inline near the battery, all are OK, also the fuses in the fuse panel. Battery is full, and switched out with another battery just to be sure there wasn't some issue with the battery. There is just a BMV712 Victron smart battery monitor, there is continuity through the shunt. Also a disconnect switch, that is turned on and also has continuity. No idea why there is no power coming from the battery. It has to be something simple. I bought this camper used, so perhaps there is a fuse or switch that I'm missing. Any ideas?

Thanks!

Kayteg1

California > Nevada

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Posted: 07/20/20 02:31pm Link  |  Quote  |  Print  |  Notify Moderator

Might be dirt on clamps.
Or did you check the power exist behind the disconnect switch?





bob213

Fresno, CA

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Posted: 07/20/20 08:04pm Link  |  Quote  |  Print  |  Notify Moderator

Was one of the three fuses you tried the resettable fuse on the frame near the battery? Small black button on side. Could be under the black chloroplast if your trailer bottom is covered. Follow your positive cable.


You can avoid reality, but you cannot avoid the consequences of avoiding reality – Ayn Rand


pianotuna

Regina, SK, Canada

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Posted: 07/20/20 10:20pm Link  |  Quote  |  Print  |  Notify Moderator

check the automatic circuit breaker in the battery bank area.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

time2roll

Southern California

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Posted: 07/20/20 10:50pm Link  |  Quote  |  Print  |  Notify Moderator

Check the battery voltage. Then check along the path and see where voltage drops to zero.
Repair, replace, adjust or clean the place of bad connection.


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Z-Peller

Oceanside BC

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Posted: 07/21/20 01:23am Link  |  Quote  |  Print  |  Notify Moderator

Your Bigfoot will have a little rectangular 30A breaker fastened with a couple of wood screws somewhere between the batteries and the disconnect switch. Follow the 8Ga. RED wire from the battery until you find it. I do not think it is a re-setable breaker....however, you say you have juice after the disconnect switch?..that 8Ga. Red wire goes from disconnect switch direct to the converter. On my 2002BF the camper battery wire and the truck charge wire both terminated on the same nut in the converter. Pull the front off your converter and have a look. Maybe the camper battery wire has pulled out of that terminal somehow?

* This post was edited 07/21/20 01:37am by Z-Peller *


Bill..
2017 Bigfoot 10.4 camper...2016 GMC 3500 4x4 Xcab Duramax Dually...

desertroad

Borrego Springs

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Posted: 07/21/20 09:18am Link  |  Quote  |  Print  |  Notify Moderator

bob213 wrote:

Was one of the three fuses you tried the resettable fuse on the frame near the battery? Small black button on side. Could be under the black chloroplast if your trailer bottom is covered. Follow your positive cable.


Thanks for your suggestion. The fuses coming from the positive pole on the battery are inline of the wires. See photo. I'm not seeing a black button on the side. This is a 1999 Bigfoot 2500 camper.

[image]

https://drive.google.com/file/d/1wuTxmYhacFgQTCIt2YQvGeVDLBYUKk49/view?usp=sharing

Z-Peller

Oceanside BC

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Posted: 07/21/20 11:57am Link  |  Quote  |  Print  |  Notify Moderator

Ok, so that 30A fuse RED wire in your pic will be the main power to the converter. Do you have the electronic battery disconnect switch or manual one?..If it is the electronic one then are you really sure you have 12v coming out of it?...thet elecrtonic switch is just a solonoid and even though it is clicking may not be making contact. I would put a jumper wire across the main RED wire in, and main RED wire out and see if the disconnect switch is really working. Your truck charge wire goes direct to the converter so will power up the 12v camper stuff regardless of the camper battery disconnect operation. The 120v converter also powers up the 12v stuff regardless of battery disconnect switch operation. I really suspect that battery disconnect switch as the problem for no camper battery power.

Z-Peller

Oceanside BC

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Posted: 07/21/20 12:21pm Link  |  Quote  |  Print  |  Notify Moderator

One other thing I will say is that either truck charge wire power, or 120v converter power, will backfeed that camper battery power RED wire from converter back to the disconnect switch "power out" terminal, so unless you have both of these other 12v power sources shut down when testing for power coming out of the disconnect switch it will give you a "hot" reading.

Z-Peller

Oceanside BC

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Posted: 07/21/20 12:26pm Link  |  Quote  |  Print  |  Notify Moderator

Made a link for you....



https://drive.google.com/file/d/1wuTxmYh........gQTCIt2YQvGeVDLBYUKk49/view?usp=sharing

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