Cat alternator not charging - Printable Version +- Wanderlodge Gurus - The Member Funded Wanderlodge Forum (http://www.wanderlodgegurus.com) +-- Forum: Yahoo Groups Archive (/forumdisplay.php?fid=61) +--- Forum: WanderlodgeForum (/forumdisplay.php?fid=63) +--- Thread: Cat alternator not charging (/showthread.php?tid=3857) |
Cat alternator not charging - Harold Prescott - 11-21-2006 07:07 Hello Forum members, First I have to thank the forum for helping out many times. Ralph Fullenwider and Stephen Britles, for their help with my headlight Mod. Now as we are getting ready leave Northern California, I'm having a problem with the cat alternator picking up the charge when switching off the shore power. My question, Is there a relay that is failing or should I just change out the alternator on the Cat? Harold Prescott '85 FC35 Marysville, Ca. Cat alternator not charging - w3ww - 11-21-2006 07:28 Harold, Before you do anything, check the voltage output at the alternator. Check it at idle and also check at 1500 or higher RPM. Those older Motorola (I think that may be the one you have) alternators seem to drop to about 10-11+/- volts at idle and generate 13.8+/- at higher RPMs. FWIW ....I thought I had a problem with mine and went to the trouble of taking the alternator off, carting it to a NAPA test facility only to have them tell me it was performing normally and it looked fine. Don Mohney 87FC35 Jensen Beach, FL [Non-text portions of this message have been removed] Cat alternator not charging - Harold Prescott - 11-21-2006 08:44 Don This alternator has been changed to a Delco....?amps. I read across the alternator and found it's charging well. 12v or more. With the engine running and nothing turned on I show a minimal discharge. (probably from the clocks etc.) However the voltage drops to about 11.75v. I believe the reason for the low voltage after a start is related to starting the eng. However when changing from shore to coach power I'm not getting a charge from the cat alt. It charges with the genset just fine. Is there a breaker that is failing to make the switch from shore power?? Harold Prescott '85FC35 Marysville, Ca. --- In WanderlodgeForum@yahoogroups.com, "w3ww" > > Harold, > > Before you do anything, check the voltage output at the alternator. Check it at idle and also check at 1500 or higher RPM. Those older Motorola (I think that may be the one you have) alternators seem to drop to about 10-11+/- volts at idle and generate 13.8+/- at higher RPMs. > > FWIW ....I thought I had a problem with mine and went to the trouble of taking the alternator off, carting it to a NAPA test facility only to have them tell me it was performing normally and it looked fine. > > Don Mohney > 87FC35 > Jensen Beach, FL > > [Non-text portions of this message have been removed] > Cat alternator not charging - Jay Darst - 11-21-2006 15:23 Harold, Do you have a Redi-Line? Maybe you have a big 12V load somewhere? With the Cat turned off, what does the volt meter read? What does the amp meter read? Now start the Cat and idle it at 1,100 rpm. Same questions, what does the voltmeter read? what does the amp meter read? Thanks Jay Darst 85PT40 Springfield, IL --- In WanderlodgeForum@yahoogroups.com, "Harold Prescott" > > > Don > This alternator has been changed to a Delco....?amps. > I read across the alternator and found it's charging well. 12v or more. > > With the engine running and nothing turned on I show a minimal > discharge. (probably from the clocks etc.) However the voltage drops > to about 11.75v. > I believe the reason for the low voltage after a start is related to > starting the eng. > However when changing from shore to coach power I'm not getting a > charge from the cat alt. > It charges with the genset just fine. > Is there a breaker that is failing to make the switch from shore power?? > > Harold Prescott > '85FC35 > Marysville, Ca. > > > > --- In WanderlodgeForum@yahoogroups.com, "w3ww" > > > > Harold, > > > > Before you do anything, check the voltage output at the alternator. > Check it at idle and also check at 1500 or higher RPM. Those older > Motorola (I think that may be the one you have) alternators seem to > drop to about 10-11+/- volts at idle and generate 13.8+/- at higher RPMs. > > > > FWIW ....I thought I had a problem with mine and went to the trouble > of taking the alternator off, carting it to a NAPA test facility only > to have them tell me it was performing normally and it looked fine. > > > > Don Mohney > > 87FC35 > > Jensen Beach, FL > > > > [Non-text portions of this message have been removed] > > > |