Eddy 1405 tuning advice
If you look at the bottom plug you will notice it has light brown/tan build up on the plug and porcelain except on the center electrode surface where the current crosses to the ground strap. Your plugs look to be clean only on the outer edge of the center electrode where the current is getting across.
If you look at the bottom plug you will notice it has light brown/tan build up on the plug and porcelain except on the center electrode surface where the current crosses to the ground strap. Your plugs look to be clean only on the outer edge of the center electrode where the current is getting across.