fuse blowing

[curver900]

I have searched and this still eludes me.. so before I go to far maybe someone can help out.


New to me 2011 Octane.. PO added a second battery which is connected correctly.. The batteries are 12.50v and 12.48V at rest


When plugged in to shore or generator power and the fuse is not blown 13.89V so they are being charged.


If I disconnect the shore power and start the generator the fuse blows. If I stop the generator and add shore power it blows. It is a 15 amp fuse I have tried a 20amp it is an instant blow. Generator running added fuse poof... then later added fuse and it was fine same result for shore power.


If the batteries are no good which I would not discount at this point, could that cause to large of a amp draw when first trying to charge them? seems odd but plausible.


Question what size fuse should this be in the green wire connected to the black wire which goes from Green positive on one battery to a black wire that goes into the trailer? (pic 1)

[ccso2213]

Generally speaking, the main fuse is a 30 amp. I would get a more educated opinion than mine, however, considering what is at stake.


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[travelingjw]

X2 on the 30 Amp fuse. Looked up your TT and can't believe battery fuse would be that small. Check output from battery to assure you have no short in wiring.

[Scott91370]

Mine also has a 30amp. I actually swapped mine out with a breaker (that says to be waterproof) like this:

https://www.amazon.com/Bussmann-CB28...ircuit+breaker

[Jagiven]

Originally Posted by curver900

I have searched and this still eludes me.. so before I go to far maybe someone can help out.


New to me 2011 Octane.. PO added a second battery which is connected correctly.. The batteries are 12.50v and 12.48V at rest


When plugged in to shore or generator power and the fuse is not blown 13.89V so they are being charged.


If I disconnect the shore power and start the generator the fuse blows. If I stop the generator and add shore power it blows. It is a 15 amp fuse I have tried a 20amp it is an instant blow. Generator running added fuse poof... then later added fuse and it was fine same result for shore power.


If the batteries are no good which I would not discount at this point, could that cause to large of a amp draw when first trying to charge them? seems odd but plausible.


Question what size fuse should this be in the green wire connected to the black wire which goes from Green positive on one battery to a black wire that goes into the trailer? (pic 1)

30 amp fuse is the normal size fuse for this location.

A couple questions, is the generator an on board unit, or a free standing unit?

Shore power, 50 amp or 30 amp (120Vac)? If you only have one AC you usually have a 30 amp 120V system, and if you have two ACs you have a 50 amp system 120 V AC power feed)l.

Next, The photos it looks like you have two different type of batteries, is that correct? All your batteries, should be of one manufacturer and of the same age, idealy, from the same lot.

Double check, if not connected to any 120 volt ac source, the fuse does not blow, is that correct?

Added thought, it's hard to tell in the photos, but I suspect your batteries might be wire up wrong. Can you sketch up where all the wires go. Simple line diagram should work. Then snap a picture of it and post it.

[curver900]

Thanks for the replies...


I just wanted to make sure it was a 30amp fuse out the get go. I am going to replace it with a 30amp Bussman...


30 amp service shore power, onboard onan 4kw, everything works so far as it should except for this little item. My guess is he was unable to locate a 30amp fuse...


Yes the batteries are in need of some love. One is the original from when he bought it so going on 7 years the other is around 4 years old... credit they work but no it is not done correctly.. 2 new batteries next spring and a new Blue Sea battery switch like on my boat...


one last question what is the orange/black wire for?


I am in MN as well...

[Jagiven]

It is hard to tell in that picture. It is best to contact Jayco with your Vin number and ask for the wiring diagram(s), there are probably 3 of them. The 12V wiring is all done by color, so it is easy to track a wire.

I suspect the orange/black wire is emergency brake power feed. If I am correct you should be able to track it back to the controller/switch. If you have an electric nose jack, it could be the power feed for that device.

[curver900]

Thanks for all the reply's appreciated.. I put in a 30amp and all is good to go...

[Scott91370]

Great to hear! Have fun out there now!!!!