Replacing the regulator at the alternator of a Golf I (Rabbit) Our Golf has a problem, the control light of the alternator is on and the voltmeter shows that the alternator is not charging the battery Thus we are going to replace the regulator For a better access we will dismount the alternator The alternator is located at the lower right side in the front of the engine Allways disconnect the battery when you are working on the electric Unplug the alternator The drive belt can be reused, mark the direction Loosen the upper pivot bolt Remove the lower bolt and release the tension of the belt Remove the drive belt Remove the nut from the upper pivot bolt Remove the pivot bolt and take off the alternator This was quite easy compared with the same work at some modern cars The regulator is located at the back side of the alternator It can be replaced at an installed alternator, too. But now we have better access for cleaning The regulator is fixed by two bolts. Use a fitting screw driver Press the regulator on the alternator while removing the bolts Take the regulator out by moving a little sideward and then upward Clean the collector rings You see the success! Clean this contact and bend it a little upwards The new and the old regulator Insert the regulator carefully and press it on the alternator Take care that the holes are aligned Insert the bolts and fasten them with care Clean the electrical contacts Put back the alternator and insert the pivot bolt Insert the lower bolt and put back the nut Loop the belt first over the crankshaft pulley then on the upper part of the alternator pulley and crank the engine a little to lift the belt over the pulley Use a pry bar to tension the belt and fasten the lower nut Check the tension and fasten the nut with 20 Nm Fasten the upper pivot bolt Plug in the cable and fix it with the clip Reconnect the battery For a test of the alternator we connect a voltmeter At low consumption we have some 14 V which reduces to 13.5 V when switching on the lights and window heating At low consumption the alternator delivers 11 A which increases to 30 A when switching on some consumers Using an oszilloscope we have a final check We see a perfect DC voltage, all is fine! Don't miss our next video.
Bye, Bye!.