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alternator overhauled still 12 volts

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hi,had the alternator overhauled at first it was readind 14 volts running noticed at weekend the voltmeter stayed at 12volts while out on a run it had also a new regulator fitted not sure why as its only one thick feed wire attached too the alternator not sure if or what has gone or a wire etc ? thanks

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The regulator is an integral part of the alternator these days..should be two wires to the alternator, one thick and one thin. Needs both to work properly. The thick wire links to the starter motor and the battery and the thin wire comes out of the wiring harness which goes to the starter solenoid and the temperature sensor...at least it does on my 82 TE. If the thin wire has come off the alternator, it should be pretty obvious where it's come from if you have a good shufti at the back of it. Also check the voltage across the battery with a multimeter, engine stopped and engine running, and monitor it for a while to see if the voltage rises and then stabilises. Good luck!

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hi john,know where your coming from but my alternator is the original motorola.yes the main feed thick brown wire to the nut at the back,also a little black box with a green wire which the guy told me it was a radio suspressor ?,the other thing for some reason a spade terminal also at back ,looking around as you say and what again the guy who stripped the alternator says its for the brown/yellow wire too the ignition light on the dash.could this be acting as a earth as tonight i connected it turned the ignition on ye the light came on with the meter and wire unpluged 11.8 volts and when pushed spade back in the load was off as i tested with a test lamp.also john the regulator is a seperate item screw bolted on could the new one be faulty cheers stu

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The alternator uses the warning light as an exciter supply to get it working...won't work without it, which is why if the bulb fails a) you have no charge and B) you don't know about it!! Always worth checking the light comes on when you switch on...it goes off when the alternator starts working and the volts across the bulb go to battery voltage each side, thus no voltage across the bulb and no light emitted! Yes, you could have a faulty regulator, but it's much more likely to be a wiring problem. No seperate earth wire needed, the whole thing is bolted to the engine which is earthed to the battery negative via a thick cable....or should be, anyway! Failing anything obvious, pull the alternator and take it back to the bloke wot dun it and ask him to test it for you...proper alternator testing really needs specialist kit.

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thanks john,great advice as i said the wire is back on and will test later and i know exactly how too go about it thanks stu

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hi john,started lotus today and yes the ignition light was on at start and went off after 30 secs ,then voltmeter gauge went up to 15 volts,took a reading off batt.which read 14.8 volts.switched off engine and gauge dropped slowly to 0 aswell as the batt,i could kick myself as i,ve always meant to replace the exciter wire,but ye john your spot on with the advice thanks again stu.

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Just seen last post..glad to have been of assistance...now I'm going to grovel under mine and do up the engine mounts...ought to be running by the weekend!!

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Hi I have an odd problem with my alternator , just put the engine back in connected every thing back up as it should be , the alternator light on the dash comes on when I connect the brown /yellow wire but the keys are'nt even in the ignition , put the keys in and turn on to start and the light goes out all other connections are correct , I did fit a new throttle and choke cable so was wondering if its some thing on the tunnel under the carpet or did I bump the alternator enough to do damage inside ???? :veryangry:

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