Quote: No one has answered how production cars with numerous electronic devices rely on the "terrible" floor pan/unibody to attach ALL the grounds in the entire vehicle. This remains the same regardless of where the battery is located. There is a heck a lot of surface area in a unibody. I do agree if the car is a rust bucket the unibody spot welds could possibly be an issue. If its so bad that the majority of the spot welds are suspect there is a way bigger issue than the ground path. When my car was completed I voltage drop tested my ground side under load. There was .2 volts drop at 28 amp draw from the center ground post of the battery to the ground wire of the dual cooling fans. The battery is grounded to a 3/8" stud welded to the cage with 1awg cable. The block/trans is also grounded with 1awg cable Doug
I think you are missing the point on race cars, it's not a voltage drop issue. it is a noise issue and old analog ignitions may never have a problem. but with new digital race ignitions it is an issue.
