Re: Follow up Question to John T. Nordhoff in Indi

Posted by John T on August 28, 2006 at 06:34:58 from (66.244.90.5):

In Reply to: Follow up Question to John T. Nordhoff in Indiana posted by Grantique on August 28, 2006 at 04:45:15:

Grantique, A genny operates from rotation of a coil of wire (the armature) inside an electromagnetic field (the Field). The electromagnetic Field gets its energy and creates magnetism by passing current through the Field windings which terminates at the gennys external Field post butttttttttttt there needs to be a current return path from the Field post to frame ground for field current to flow and the more current the greater the electromagnetic field strength and the more the genny pumps out.

Soooooooo to regulate whether the gennys is max charging (Field post dead grounded) or low charging (field grounded via a resistor) the combination light switch with charging control switch is used. The gennys Field post is wired up to that light switch and when in Max charge it simply dead grounds the field to frame, but in low charge it grounds via a series resistor on the switch.

Therefore, if you dead ground the gennys Field post she should max charge. If when running if you dead ground it she charges but DOES NOT OTHERWISE then the problems EITHER the wires bad/open from the gennys Field post up to the switch,,,,,,,,,,,,, orrrrrrrrrrr the switch is bad orrrrrrrrr,,,,,,,,,,,, the switch has a poor frame ground connection. If she still dont charge even with a dead grounded Field post leave it grounded n by pass jump around the cutout relay (connects it BAT and GEN terminals together) n see if she charges then in case the cutout relay is bad and isnt closing as it should?????

You ought to polarize that new genny FIRST have you done that???????? If you momentarily flash jump across the cutout relay (hook its BAT and GEN) together you ought to get a small spark. To be safe go ahead n dead ground the gennys Field post first in case it isnt getitng a good ground otherwise, it needs a ground so you get that lil spark when you polarize.

Sooooooooo if shes charging the battery voltage should rise from approx 6.3 volts (good battery) when setting up to 6.5 to 7 or so volts at wide open running with a good charging system and the lights get noticeably brighter from idle to wide open. The unloaded open voltage on a genny dont really tell you all that much regardless how much it rises THE REAL TEST is what happens when attached to a load like the battery and if it causes the battery voltage to rise somwehat cuz its pumping current into (charging) versus drawign current out of (discharging) the battery.

The Normally Open cutout relay is supposed to close once the gennys output voltage exceeds battery voltage so the gennys outoput can get to n charge the battery but open otherwise like when shes shut down so the battery dotn reverse discharge through the genny.

Sooooooo see what happens if she running and you dead ground the gennys Field post??????? If she charges then look for a bad wire from the gennys Field post up to the switch or the switch isnt well grounded or its simply baddddddd. Both the genny and cutout relay needs a good ground adn that combo light switch needs a good ground also plus the belt be tight and a good battery capable of accepting a charge. A bad batetry with a bad cell may not charge and even drag down the gennys output so be sure its good also. That 6.05 reading concerns me a lil cuz a good batetry ougth to read 6.3 volts sitting there!!!!!!! if its bad it may not take a charge !!!!!!!!

Lemme know

John T

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