Check the ground on the headunit first.
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ScottinBend Space CowboySupporting Member
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docv Well-Known MemberLifetime Supporter
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Dave.0 Helix & RMW PoweredLifetime Supporter
Yup ^ Ground on HU and also check your battery ground and motor grounds.
Also check the coil buy sanding down the ends to get rid of any rust. Pay attention to the two back ones.