Tazio Posted December 7, 2014 Share Posted December 7, 2014 I am wiring in my little Denso alternator, one of the pins goes to a ' switched live', but honestly I am not clear on what that means. I have read previous posts and I'm still not clear, and rather than return to my old maths schooldays and pretend I really did understand algebra, I thought I would come and ask here. Would I be right in thinking that a switched live only provides 12v when the ignition is on?, therefore if I connected into my fuel pump feed I would be right?. Thanks from my very cold garage... Link to comment Share on other sites More sharing options...
SM25T Posted December 7, 2014 Share Posted December 7, 2014 A switched live has 12V on when the ignition is switched on. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted December 7, 2014 Member Share Posted December 7, 2014 What SM25T says.What's the nominal current draw on that feed?Can you post or link to the diagram or manual?Jonathan Link to comment Share on other sites More sharing options...
Tazio Posted December 7, 2014 Author Share Posted December 7, 2014 Lol, the only instructions I have are from a wiring diagram I found via Google. The only other problem is that I don't have an ignition switch, but I am assuming that as the pump is normally only live when switched on by the ecu, then I'd be ok to use that? Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted December 7, 2014 Member Share Posted December 7, 2014 What do you have that's like an ignition switch?Yes, the fuel pump will be fed with a switched live but also will be killed by the inertia switch and might have something unusual if it's controlled by the ECU.The bit I would be most concerned about with wiring it that way is drawing too much current. This might blow a fuse or ask the wire to carry too much current.What's the model or part number of the alternator?Jonathan Link to comment Share on other sites More sharing options...
ECR Posted December 7, 2014 Share Posted December 7, 2014 Is it a 2 wire model where 2 wires go to a T shaped plug and a third Thick wire goes to a screw terminal ? Link to comment Share on other sites More sharing options...
Tazio Posted December 7, 2014 Author Share Posted December 7, 2014 Roger,Yes that's the one.Alan Link to comment Share on other sites More sharing options...
ECR Posted December 7, 2014 Share Posted December 7, 2014 You have mail with a drawing attached ... Link to comment Share on other sites More sharing options...
Tazio Posted December 7, 2014 Author Share Posted December 7, 2014 Thanks Roger, much appreciated Link to comment Share on other sites More sharing options...
Mankee Posted December 8, 2014 Share Posted December 8, 2014 Roger, being the curious sort, could you forward the drawing onto me as well, please? I have a similar Denso/Powerlite to fit that needs a switch 12v as well. I was simply going to run one from the ignition toggle, which was the original barrel's terminal 15. Thanks! Link to comment Share on other sites More sharing options...
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