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You mention wiring to the battery. Are you wiring the ground/negative wire to the battery as well? This is a no-no, not good practice especially on modern cars with smart charging. Instead you should run the negative power wire to a point on the body/chassis adjacent to where the main negative wire from the battery connects to the body/chassis.

http://k0bg.com/wiring.html#power

It could be that by not doing that and going straight to the battery you're creating a ground loop when you touch the bracket onto the metal bodywork of the vehicle.

[QUOTE="M0GVZ, post: 578888, member: 22312"] You mention wiring to the battery. Are you wiring the ground/negative wire to the battery as well? This is a no-no, not good practice especially on modern cars with smart charging. Instead you should run the negative power wire to a point on the body/chassis adjacent to where the main negative wire from the battery connects to the body/chassis. [URL]http://k0bg.com/wiring.html#power[/URL] It could be that by not doing that and going straight to the battery you're creating a ground loop when you touch the bracket onto the metal bodywork of the vehicle. [/QUOTE]

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