No 12 vdc power after changing to a new house battery

[Steve11669]

2005 greyhawk SS31.
I put a new house battery in, prior to that, all electical was functioning normally. Ater the new battery was installed, None of the 12 vdc systems are working ie, lights, fridge (controller) water pump etc. the battery disconnect switch is not switching as I dont hear the clunk like I did prior to battery change.
New battery is fully charged and all connection were checked. I have power to the 12 vdc fuses.

Help plz

[Jeffp60]

Battery to disconnect is where I would look first. You're SURE proper polarity?

[Robbbyr]

Jayco has a habit of not identifying all positive connections as such. I have black conductors that have to be hooked to the positive terminal. Did you take a "before" picture you can reference now?

[RogerR]

Have you checked the fuse or breaker near the battery box and at the converter? Since you are plugged in the converter should be energizing the circuit even if battery was dead.

Also, double check polarity and that the connections are clean and free of corrosion plus tight.

[Steve11669]

Additionally, can anyone tell me where the shutoff relay device? Would it normally be near the house battery location?

[Grumpy]

It was usually located on the side or rear of the battery compartment

[Steve11669]

FOUND IT! It was a faulty fuse just off the hiuse battery with a short cable to a solenoid. I guess the solinoid is the battery cutoff device. The fuse had a loose terminal bolt (not the nut) which cause an intermittant situation. When I installed the new battery, it jarred the fuse.

There is not an amperage stamped on the old fuse so I dont know what size to put in. I will try 50 amps.

Thanks to the brain trust for the help!

[Grumpy]

If it's a spade fuse you can go by color.

[16WhiteColly]

Mine trailer has a Red 30A blade fuse for protection.

[Steve11669]

Originally Posted by 16WhiteColly

Mine trailer has a Red 30A blade fuse for protection.

Thank you, i guess that’s what I’ll use since both our rigs are 30 amps.

My fuse was a plastic box 1x2 inch with bolts for the connectors.

Thanks to all helpers.

[JFlightRisk]

Does it look like this:

https://www.amazon.com/uxcell-Strip-.../dp/B07NRKRMD8

Or maybe this style:

https://www.amazon.com/RENOGY-30A-AN...2209560&sr=8-6

[Steve11669]

Looks like this in the attachment.

[Grumpy]

Originally Posted by Steve11669

Looks like this in the attachment.

That's an auto reset circuit breaker, better than a fuse.

[Steve11669]

Originally Posted by Grumpy

That's an auto reset circuit breaker, better than a fuse.

Good to hear. The one in the picture was off the web, the one I put in was like that but 50 amps with mounting feet. I guessed at what amperage to use. I probably should have used a 30 amp but I had already installed it (before getting the thread above about the 30 amp fuse used in the trailer). Its not to easy to change out now. What do you think about that?

[norty1]

I would put a 30a protection if that was the original. Even my 50a rig has a 30a battery fuse.

[Grumpy]

Originally Posted by Steve11669

What do you think about that?

As Norty said, go back to the 30. The wire that is being used is only sized for 30 amps and not 50.

[Steve11669]

Originally Posted by norty1

I would put a 30a protection if that was the original. Even my 50a rig has a 30a battery fuse.

I dont know what the original was cause it wasnt marked. I will put a 30 amp in, makes sense.

Thx

[thenne1713]

Most Likely installed Reverse polarity and blew the two 30a Main Reverse fuses at Power Center? If battery cable BLACK/WHITE, THEN BLACK=POS+, but if RED/BLACK, BLACK=NEG- Verify by following cable to frame connection or device?