A couple of yrs ago I built a 12v / 240v power box for the scope. I put it in a DIY thread at the time, searched but can't find the thread.
It was an empty PC tower fitted with a 240v to 12v transformer as well as a 12v to 240 inverter. Has a 12v inlet & a 240v inlet with switches to isolate each when the other is being used.
Anyway, it's been working fine every time I use it. Last time I used it, it had a little hic-cup with 12v supply cables, but was quickly fixed.
Tonight I set up in the back yard, plugged in the 12v supply & blew a fuse. Started checking the general circuits with a meter.
Direct short between + & -.
I disconnected cables checking with the meter as I go. Everything is connected correctly. I can't for the life of me figure out how or why I'm registering a circuit between pos & Neg.
Anyone got any ideas???