OK.... it's an intermittent fault so the mechanic will NEVER find it. I of course suspect the main relay (replaced once, like 10 years ago). So... thought I'd wire in a switch across the terminals which I could use to bypass it when it is being uncooperative, and either prove or disprove the relay theory. And make the car run, if I am right. But I can't find my wiring manual. So... which terminals would be appropriate to bypass/jump? Thanks.