Cheers, nicely explained, so running headlights should be ok with that amount of charge going in to the battery. I was thinking the battery would drain faster than it could recharge!
The reason the wire mesh is in front of the lights is for two reasons, well three reasons really

It was already in place and I had just painted it as it was rusty,,,
Also, the new lights are a different shape to the holes already in the bonnet as I could not get original items. So to make these lights a snug fit I would have to trim metal off of each side of the headlight hole and weld a strip along the top and bottom of each hole and make the bracket to mount them so the lenses are just protruding through, with a rubber trim around the opening and obviously paint the front of the bonnet. I like the "simple is efficient" rule!
As for stones flying up, when it is on a trailer on the back of my van going to and from jobs, yes it is quite possible, which is why I left them as a type of stone guard, I live on a small island, 26 miles long, and approx. 13 miles wide, (146 sq miles) and our roads are horrendous
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