On Feb 28, 6:31*pm, " wrote:
I have a shorted capacitor in OLJK switch. *I am looking of a web
site, wiring diagram, new capacitor ect. *This is a switch that allows
you to change batteries without losing power.

Can anyone help??

Bill Snead

I doubt you have a shorted capacitor. These things likely contain a
tantalum capacitor or similar. Those capacitors tend to fail open-
circuit and often due to being accident having the reverse voltage
applied--but hopefully a good design would have diode protection to
avoid this. And if anything has fails closed circuit across your
battery it will likely be open circuit pretty quickly...

I've never heard of an OLJK switch. If these are you trying to deal
with switch contact lag times of order 1-10 ms, ~10V and 1A type loads
then you can end up needing capacitors of order 1000uF or so, it all
depends on the voltage tolerance of the load. In this scenario the
capacitor is just placed across the load (it is if it inside the
master switch). If much smaller capacitors work in practice I start to
question wether they are needed at all--are you sure this is needed in
your case? If what you are trying to solve is a transient glitch
causing a problem for a logger, you are better off putting the
capacitor (and diodes) across just that devices. This has been
discussed here before. Search for Volkslogger and capacitor.

Personally I prefer two suitably sized master switches that allow
either or both batteries to be on the main buss.

Darryl