When you put the key in it presses the spring down causes the piece of metal to make contact with the two terminals and complete the circuit. It's a very basic device there are just the two terminals and a piece of metal that is held in place by a spring. I thought maybe there was a fuse in there or something but there isn't. I took one of the popped switches apart to see what was going on inside and see what I had blown but all looks absolutely fine inside. Fitted this, went to start the car and that one popped too.
I thought maybe I just had a dodgy switch that couldn't handle the amps or something as it was just a cheap one off eBay so I bought another off Amazon that said it was rated up to 400amps. I took the switch back off and put everything back to how it was pre switch and the car came back to life again. That all seemed to be good, it was turning the electrics on and off just like I wanted but then when I went to start the car there was a pop sound and all the electrics died. So the negative cable runs to the exact same place it just has the switch on it now. So I unbolted the cable from the chassis and bolted it to one of the terminals on the switch instead and then ran another piece of battery cable from the other terminal on the switch to the chassis. The car battery is in the boot and the negative cable runs from the negative terminal of the battery and bolts to the chassis under where the back seats used to be. I bought by a switch like this one but off eBay:
Car isolator switch plus#
I want to fit a battery isolator switch as it will be sat not being used for long periods of time plus I think it's sensible for safety too in the event of a bad crash to be able to quickly turn off all the electrics. I've got an Audi TT MK2 2.0 TFSI which I'm preparing for track use.
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