s50b30 Posted March 20, 2013 Share Posted March 20, 2013 Hello there. Can anyone tell me how to starter is wired? I have bought a Project that hasent been started yet, and it seems the starter is Connected directly from the alternator, With Heavy gauge wire. Is that right`? The trigger cable is not hooked up, but I will hook up a relay. What amp rating should it be? and the fuse? Quote Link to comment Share on other sites More sharing options...
Kaan W Posted March 20, 2013 Share Posted March 20, 2013 The alternator has to be running to supply power to the starter Quote Link to comment Share on other sites More sharing options...
Shane Posted March 20, 2013 Share Posted March 20, 2013 (edited) Hello there. Can anyone tell me how to starter is wired? I have bought a Project that hasent been started yet, and it seems the starter is Connected directly from the alternator, With Heavy gauge wire. Is that right`? The trigger cable is not hooked up, but I will hook up a relay. What amp rating should it be? and the fuse? When you say heavy gauge wire, I guess you mean seriously thick battery cable stuff? Not 100% sure on a supra without looking, but its pretty normal in a lot of vehicles for the heavy live cable from the battery to be connected to the alternator and then go on to the starter, or even vice versa, depending on what's closest to the battery and whats practical for cable dressing . The shorter route from the battery to the starter the better though. You would need quite a chunky relay for the starter solenoid of things, 30 amp one would be more than enough I would have thought. Once its going use an ammeter to see how much the solenoid draws when pulled and rate your fuse accordingly. The alternator has to be running to supply power to the starter Want to elaborate? Edited March 20, 2013 by Shane (see edit history) Quote Link to comment Share on other sites More sharing options...
Kev.O Posted March 20, 2013 Share Posted March 20, 2013 I thought the starter is wired direct to the battery and the trigger wire is a positive from the ignition barrel protected with a 7.5 amp fuse. Quote Link to comment Share on other sites More sharing options...
s50b30 Posted March 21, 2013 Author Share Posted March 21, 2013 That might be. But 7.5 amp sounds small. The wire ia at least 2.5mm2 Edit: but is is supposed to have constant power from battery? Not the trigger, the fat one. Quote Link to comment Share on other sites More sharing options...
Shane Posted March 21, 2013 Share Posted March 21, 2013 (edited) That might be. But 7.5 amp sounds small. The wire ia at least 2.5mm2 Edit: but is is supposed to have constant power from battery? Not the trigger, the fat one. OK what is left of the original wiring, or is this a complete re-wire custom project? This is all you need to do to get it running. I have included basic alternator wiring, but in fact to get it to crankyou dont even need to worry about that. Oh and yes, its perfectly normal to have a permanent unfused connection between the battery, starter and alternator for the main feed via the fat cable. Edited March 21, 2013 by Shane added a bit (see edit history) Quote Link to comment Share on other sites More sharing options...
s50b30 Posted March 21, 2013 Author Share Posted March 21, 2013 Thank you very much. I am missing the alternator wiring. What is lg? A saw somebody hook all 3 wires from alt plug directly to the 12v post on the alternator. Will that work? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 21, 2013 Share Posted March 21, 2013 Heavy post on starter is a permanent + 12V battery feed. Spade terminal is ignition switch "start" position feed (12V +). Ground is through engine block. Quote Link to comment Share on other sites More sharing options...
Shane Posted March 21, 2013 Share Posted March 21, 2013 (edited) Thank you very much. I am missing the alternator wiring. What is lg? A saw somebody hook all 3 wires from alt plug directly to the 12v post on the alternator. Will that work? Ig - Ignition voltage, ie. switched, otherwise your battery will drain via the alternator when it is not running if you use an unswitched exciter voltage. Depends on the alternator, most have the heavy terminal that is your permanent feed to the battery, a voltage sense terminal and a exciter terminal. Google the alternator type to find out which pin is which. You risk damaging the regulator in the alternator if you simply connect everything to + volts. Have a read of this: all is explained http://www.chargerr.com/Alternators/ALT.HTM Edited March 21, 2013 by Shane added link (see edit history) Quote Link to comment Share on other sites More sharing options...
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