12 volt lighting 4 camp trailer help

You have a short !!!!

Take out the globes, and if the fuse still blows when the switch is turned on, then you have a short in the wiring !!!!

Hi
Your formula is corect.,some thing is wrong!,are they definatly 12v bulbs only[not 240v units with transformer ]??
Suggest you take out the bulb &see if you still blow fuse ,if so you have ashort circuit smewhere

Hi Walks

1) Are they 12V globes ?
2) Are they wired in parallel or series ? (Must be parallel)
3) Have you got a fire extinguisher handy ?

I do not recommend this type of globe in a wooden box unless it is quite large and has air flow. I don't know why the fuse is blowing but it may be just your luck that you can't get them working. Use the proper holders for this type of globe or switch to LED or Fluoro.

Regards

Derek.

thx ill check tomorrow

I use these lamps too - they provide excellent pure white light. Not as efficient as Leds or fluorescents, but they more than make up for that in quality of light. As Derek says, provide plenty of ventilation, since a lot of that 20W will be released as heat, and of course use only the bulb and socket - NO transformer. You will need high temperature wire going into the socket, not plastic coated stuff for the first few inches as that will melt and short out. You definitely have a short somewhere in your wiring - maybe in the lamp socket. I wouldn't go above a 10A fuse, and for fault finding I'd temporarily put a 12V lamp in series with the line at the battery to show how much current is flowing and economise on blown fuses.

HTH


John