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compression testing the engine....will this work? 900

I would do the disconnect. I haven't looked closely at the Volvo wiring diagrams but most older ignition systems had a circuit that sent full battery voltage to the coil during cranking via the solenoid. The ign. switch didn't need to be on for there to be spark. This probably isn't necessary anymore with electronic ignition systems but why take the chance when all you have to do is disconnect a wire? Your idea IS neat but I hate to tell you, it has been in use for a few decades over here. I still use the cheater switch I bought for my first car back in '70.
--
Bob Kraushaar '94 945T, '91 940T, '88 240, '94 F-150, '68 Shelby GT-500 KR






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