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Old 07-07-2012, 10:05 AM   #1
Beavis
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Default Race car kill switch

Im wanting to wire in a kill switch to a stock ecu wiring loom does any one have any ideas how and where to kill the alternator as well

Thanks
Graeme
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Old 07-07-2012, 10:09 AM   #2
l_jonez
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Won't it be better to have it on the positive cable and kill every thing ?
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Old 07-07-2012, 10:25 AM   #3
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you have to wire in the kill switch properly to the alternator something
or the motor can keep running or damage the alternator .(i think)
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Old 07-07-2012, 10:39 AM   #4
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You wire your 'proper' kill switch into the +ve feed from / to the alternator so that you are killing main power to everythng.

By 'proper' I mean the type with one of the big heat sinking resistors which you earth to the car body so when you flip the kill switch it breaks the main +ve & dumps the Alt to earth so it 'kills' everything properly.

It's a long time since I did this job so I'd suggest you read the interweb for the exact description of where/how to fit your kill switch.

With an injected car you should also fit an 'upside-down' ball bearing thingumy kill switch on your fuel pump so that if 'god forbid' you end up the wrong way up the ball falls out of the cup, breaking the circuit & killing the HP pump immediately.
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Old 07-07-2012, 07:34 PM   #5
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Thanks Andy
i will have to keep a eye out for the balls and cup thing never heard of it before just wondering if the stock car was fitted with such a device ?
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Old 05-10-2012, 07:54 AM   #6
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The fuel pump kill switch is often called an inertia switch & is fitted to most modern petrol injected cars. They're normally black plastic with a rubber cap which you press to reset. They operate if the car has a sudden bump (crash) & you should be able to buy one for a few quid at most breakers.
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Old 05-10-2012, 09:39 AM   #7
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Quote:
Originally Posted by Andy_S View Post
You wire your 'proper' kill switch into the +ve feed from / to the alternator so that you are killing main power to everythng.

By 'proper' I mean the type with one of the big heat sinking resistors which you earth to the car body so when you flip the kill switch it breaks the main +ve & dumps the Alt to earth so it 'kills' everything properly.

It's a long time since I did this job so I'd suggest you read the interweb for the exact description of where/how to fit your kill switch.

With an injected car you should also fit an 'upside-down' ball bearing thingumy kill switch on your fuel pump so that if 'god forbid' you end up the wrong way up the ball falls out of the cup, breaking the circuit & killing the HP pump immediately.
Ive got the FIA cut off same as you Andy. The heat sink thing that they give you in the kit is pineapple, the wire breaks and blimey they don't half get hot......which you would expect really. Do you use a different one?

Paul
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