FWIW, I'd be interested in the thing that sat on top. Seems like that wouldn't wear out and would be cheaper than the combination. I have an older car with occ

FWIW, I'd be interested in the thing that sat on top. Seems like that wouldn't wear out and would be cheaper than the combination. I have an older car with occasional electrical gremlins. My battery is fine, but an ounce of prevention...