eBay vehicle battery disconnectors/isolators

A look at some cheap eBay battery disconnectors that allow you to quickly disconnect a battery for working on a vehicle or preventing battery draining while a vehicle is not in use.

When I bought these I thought they might be solid brass, but it appears that all that glitters is neither gold nor brass. I wonder how well the plating will last. It's made me ponder the best metals for compatibility with the traditional lead battery terminals.

Never use one of the wire-brush terminal cleaners on these. It will quickly remove the contact plating.

Eric-O at South Main Auto seems to come across a lot of problems with ground connections onto aluminium engine blocks. The standard test for that is to measure for voltage difference across what should be solid connections when under load.

Apparently the fuse option is used as a security feature. It's wired across the isolator/disconnector and keeps the system powered to retain settings, but will blow the fuse if anyone tries to start the car.

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