Originally Posted by 68Glbtrotter
...The blue wire connects to a ?fuse/breaker?; then a heavy duty black wire goes somewhere (I'll find out where) but what I can't find is the value/data of this block. ..It reads open with an ohmmeter. ...Will someone please identify and guess at its value...
I believe you have found the charge wire's self-resetting circuit breaker. On my '67 Airstream, it is rated at 25 amps.
Coincidental with replacing a bad light switch, I had one of my three, 12 volt
, inside breakers bite the dust. Kinda cool how simple the breakers are. The autopsy showed the device has nothing more than a bimetallic strip with [apparently] a certain amount of electrical resistance. When too much current is drawn, the strip pops the circuit open. When cool, it closes.
In my case, the contacts had fused, and melted away from the strip. The point source heating made the breaker work in an interesting way.
Luckily, with minor modification, the breakers being sold nowadays are physically quite similar to what I had. At $3 a pop, I replaced all three breakers.