stuck Posted February 3, 2012 Share Posted February 3, 2012 Gents, Does anybody have a wiring diagram for a P38 v8 alternator they can share? Thanks, Mick Quote Link to comment Share on other sites More sharing options...
zim Posted February 3, 2012 Share Posted February 3, 2012 What do you need to know ? There're only a few wires on it. G Quote Link to comment Share on other sites More sharing options...
stuck Posted February 3, 2012 Author Share Posted February 3, 2012 Hi G, Just need to know which terminal is for excitation & which is the "earth" for the warning light. Quote Link to comment Share on other sites More sharing options...
zim Posted February 3, 2012 Share Posted February 3, 2012 Mick, Looking from the back, the one on the extreme right is to the battery (the big one). The one in the middle goes to your dash light. The one on the left is not used on mine, i'm assuming it's for a tacho on other vehicles ? You talk about excitation & which is the "earth" for the warning light. these are the same thing. Not sure if you're aware how it works, but : From your key you get 12v...this goes to the dash light....then to the alt. If the key is on, but the alt is not spinning, you have 12v -> 0v = light on If the key is on, alt is spinning, you have 12v -> 12v = light is off If the key is on, alt is spinning (but not working) you have 12v -> 0v = light on (or on flickering if the voltages are low). This is why you have your battery light on when you turn the ignition on before starting and also why the light comes on when you have a dodgy alt. Now...have you got that mot yet ? G Quote Link to comment Share on other sites More sharing options...
stuck Posted February 3, 2012 Author Share Posted February 3, 2012 Cheers G, Yes she passed with no advisories, happy days! Think my bloody alternator has packed in now though. Quote Link to comment Share on other sites More sharing options...
zim Posted February 4, 2012 Share Posted February 4, 2012 I got a brand new one from Manchester Auto Electrics. £70, bosch i think it was. Apparently they're not worth refurbing as something else inside buggers up. (A refurb by them was about £70, but they advised against it). G Quote Link to comment Share on other sites More sharing options...
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