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Stephenscity 10-25-2012 13:53:29 72.73.34.12 Report to Moderator	Can someone explain to me how the voltage regulator on an 8n works? According to the shop manual one set of points stay closed. Is the other set suppose to pull in to charge when needed and at what voltage? Mine stay open and if I manually pull them in it shows a little over 7v.I am trying to trouble shoot a charging problem. Thanks [Reply]   [No Email]
Stephenscity 10-25-2012 14:17:22 72.73.34.12 Report to Moderator	Re: 8N voltage regulator in reply to Stephenscity, 10-25-2012 13:53:29   Thanks guys so if I understand this right if the ope set are not pulling in then that would explain the loss of charge and probably need to replace?and with a little over 7v when manually pulled in the genny is putting out what she should? [Reply]  [No Email]
soundguy 10-25-2012 14:25:35 184.245.232.13 Report to Moderator	Re: 8N voltage regulator in reply to Stephenscity, 10-25-2012 14:17:22   yup. if the field contact works, and she charges normal except the cutout.. and you don't want to buy a 40$ reg.. hit radio shack and buy a 25a full wave brisge and wire in one of the diode sections across the armature and battery tabs.. cathode, the straight line is neg, anode is the triangle.. thus if positive ground.. put the flat line to the armature, and the triangle to the battery.. she should work about like normal... [Reply]  [No Email]
soundguy 10-25-2012 14:07:36 184.245.232.13 Report to Moderator	Re: 8N voltage regulator in reply to Stephenscity, 10-25-2012 13:53:29   essentially you have a cutout relay that pulls in when charge voltage comes up, and a field contact that has a bias resistor across it. with machine off.. the field will be closed, and cutout open. the field will vibrate based on field current needs , based on voltage. there may or may not be a current limiting circuit built in, depending on if it's a generic reg.. etc. you can use jumper wires to bypass the vreg cutout and field and motor test and full field the genny.. etc.. [Reply]  [No Email]
JMOR 10-25-2012 14:04:08 72.181.173.171 Report to Moderator	Re: 8N voltage regulator in reply to Den N Ms, 10-25-2012 13:53:29   The normally open (as if disconnected & sitting on the table) set of contacts are used to connect the battery to the generator armature when generator output voltage reaches 6.1 to 6.5 volts, as sensed by the shunt coil under that set of contacts. The other set are Field control contacts (normally closed) and will begin to open & close as needed to reduce generator field current as battery voltage reached a higher state of charge (6.9 to 7.4 volts). Some VR units also incorporate current control to protect the generator. Those will be the heavy wire windings. [Reply]  [No Email]
36 coupe 10-25-2012 16:16:41 66.186.169.176 Report to Moderator	Re: 8N voltage regulator in reply to JMOR, 10-25-2012 14:04:08   I have found many regulators with open shunt coils.Closing the cutout points by hand will show a charge on the ammeter but the next time the engine stops you will see no charge on the ammeter after restarting. [Reply]  [No Email]
soundguy 10-25-2012 14:21:33 184.245.232.13 Report to Moderator	Re: 8N voltage regulator in reply to JMOR, 10-25-2012 14:04:08   stole my thunder and said it better than I did too! ;) darn this slow connection.. :) [Reply]  [No Email]