Guffin, I tried a an Anod in the cut out on my 1928 Buick and I am not getting good results. I copied the set up that they sell for early Ford V8s. The Ford with the positive ground uses a Diod. I figured that with the negative ground, I needed an Anod so I bought one with the same value as the Ford Diod. My car worked fine with the cut out relay but when it went out and they wanted $75.00 for a replacement one, I tried the modification. Do you have any ideas that will help me on this?