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280ZX doesn't run if battery disconnect switch is installed

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Damn I'm stumped, posting on here after who knows how many years. 


Anyways I have a 1983 280ZX N/A and after installing a battery cutout switch on the negative terminal the car misfires and runs very rich.  However, if I wire the chassis ground directly back to the battery it works fine, but that defeats the purpose of a cutout switch. 


Engine wise it is generally stock. I have 2 gauge from negative to switch, 4 gauge from switch to starter, 8 gauge from switch to chassis.


Any ideas ?


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