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When you say charging,do you mean amp reading or volt reading?Amps should rise when first started then drop.Volts should stay close to constant.The small wire going to the alternator to power the regulator in the alternator is just switched power.If the volts fall under 14 after ten minutes you may need to try a replacement alternator.
knowing the color codes can be a great help..usually in 12v reg system,from the regulator there are 6 white wire having a stripe codes,blue means neutral,green means field,black means ground to body,white means hot wired to +12v,yellow means to bat charging indicator going to instrument panel and finally red means to ignition....and always secure the regulators case to ground.
G'day, You say you are only getting 12v to the battery(& I presume you tested this with the engine running) then that is too low. It needs to charge from about 13.5 to 14.2volts(DC). Common causes of a low charge rate are, Faulty voltage regulator. Faulty alternator(stator usually).
You need to have these items tested to dertermine which is at fault.
Unless your experienced, faultfinding charging systems can be tricky & you need a couple of special tools too do it efficiently.
If your up for it- & have a multi meter, You can start by disconnecting the wiring at the regulator. Using the meter set to resistance-ohms times 1- check between the three yellow wires-yellow to one yellow then the other-see you get same readings & should be quite low(just a couple or few ohms) Now set your resistance scale to max. Probe between each yellow wire & earth.(don't let your fingers touch the probes-it will give a false reading) There should be NO CONUNUITY- Any reading between the stator yellow wires & earth means a faulty stator. As for the regulator- there all different so manufacturers specs are usuall needed.- as are test procedures.
Hope this has helped some what regards Andrew Porrelli
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