strange battery behavour

[sinclairuser]

my minipulse is being built into a dead fisher 1266 enclosure, i'm using the fisher battery box/ configuration, today when closing up it started acting weird.
the mpp works fine, so does my meter circuit(modern version of the goldscan meter), but the batteries seem to get hot, every thing tests ok with the meter,
but when connected up to a load they get hot and start flipping polarity, strange has anyone seen this before, in all my years i have not.
tomorrow i am going to rip out the fisher battery wires and connectors and redo the whole shebang, i just thought i would share what happened.
thanks
aly.

[sinclairuser]

stripped out the old wires and fisher connectors, replaced them with new, protected all solder joints with colour coded shrink tube.
the old wires were shot, in a couple of places it could have potentially shorted out, seems to have cured it batteries no longer get warm and flip polarity, voltage is now correct and stable, just got to finish it up now.

[Funfinder]

Thanx for the info because I have such a Fisher.
Of course I wonder how the cables can get in such bad shape.
Through coil sweeping or water?
Should not happen.

[sinclairuser]

hi funfinder, my guess is all those years of detectorists pulling the wire as they install new batteries.
but its fine now, the 1266 is an excellent machine even today(just a little heavy), i was gutted when i could not repair it.
look out for my completed minipulse in the mpp thread, as i have done a few mods to the handle, it looks pretty much the same but is only half the weight.