Does Enfield still power the headlight straight off the AC supply? I had GPS issues with my bullet and eventually concluded the whole system was upset by the headlight having a direct AC connection but sharing the earth with DC circuits. You'd get earths that weren't at zero volts depending how far they were from the headlight connection. Some places you had 13V others 10.
GPS and Intercoms should have surge protection circuits, but typically these only work to 18V.
Andy
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