Author	[Modern View]
waynemo 01-27-2013 10:45:45 99.189.64.165 Report to Moderator	I adjusted my regulator voltage output by increasing the spring force and my first attempt increased the voltage to 7.6 to 7.8 volts. This is above Jmor's specs of 7.1 to 7.5 volts. I will try to get within those specs but wonder what would fail with the voltage values above. Could the field coils in the generator and regulator stand these higher values or is it just about over charging the battery? Another question on B circuit systems about checking the generator output. On A circuit systems, it is easy to just ground the field terminal taking the regulator out of the system and measuring the generator output. What about B circuit systems, could you just put full voltage on the generator field {after disconnecting the regulator} and measure the generator output, or is that too much strain on the generator field windings? [Reply]   [No Email]
JMOR 01-27-2013 10:56:45 72.181.173.171 Report to Moderator	Re: 641 voltage regulator in reply to waynemo, 01-27-2013 10:45:45   Quoting Removed, click Modern View to seeYes, "just put full voltage on the generator field" is acceptable, as this is exactly what is being done by regulator at times. Voltage measured under these conditions will largely depend on charge state of the battery, however. If you were to disconnect battery to ARM then generator voltage can reach damaging levels under full field conditions (>20 volts) & in a short time damage gen & regulator. I would NOT recommend such a disconnect. A GM manual gives "set point" voltages for the VR and also "upper acceptable' voltages, with that being 7.6 volts. It is primarily to prevent overcharging the battery.   [Reply]  [No Email]
waynemo 01-27-2013 11:38:39 99.189.64.165 Report to Moderator	Re: 641 voltage regulator in reply to JMOR, 01-27-2013 10:56:45   Thanks jmor that is good information. I think lots of guys here will benefit knowing how to check out generators. In the case of B systems, I would only use the full voltage to field test for a short time to determine if the generator was at fault. As far as the voltage over the spec in my case, I use the tractor seldom and not for long running times either. I might be satisfied using the higher voltages in order to keep the battery fully charged. I would not think a battery would be damaged in that way with charging voltages up to 8 volts even. I appreciate your input!   [Reply]  [No Email]
JMOR 01-27-2013 20:10:56 72.181.173.171 Report to Moderator	Re: 641 voltage regulator in reply to waynemo, 01-27-2013 11:38:39   Quoting Removed, click Modern View to seeAgree. You are welcome!   [Reply]  [No Email]