k fuku Posted March 5, 2021 Report Share Posted March 5, 2021 Is it necessary to connect all GND (black) grounds? Is it necessary to connect all of them to the A and B connectors, which have two each? The manual recommends connecting them to the engine block, but is there a problem with connecting them to the battery negative? Quote Link to comment Share on other sites More sharing options...
essb00 Posted March 5, 2021 Report Share Posted March 5, 2021 When your engine is running, you would want to have the smallest ground loop to the power source -- which is the alternator (unless your engine runs without one), which is why it is recommended to have the grounds connected on the engine block/cylinder head. Smaller ground loop means minimal chances that other accessory loads would be having to share the same ground (having more resistance) to the power source. More grounds, less resistance. Then there is less chance the ECU would be picking electromagnetic interference from ignition system. If you have the ECU grounds connected to battery negative, it would still have to share the ground wire from the battery negative to engine block with other accessories. JeremiahJ and k fuku 1 1 Quote Link to comment Share on other sites More sharing options...
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