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Topic: alternator not charging  (Read 372 times) previous topic - next topic

alternator not charging

my alternator is not charging, but if i tap it , it will start to charge . I also notices it gets warm .. is this normal... i just replaced the two house batts one of which had a short . and before it had shorted out . the alt, worked fine . so what I'm thinking is i need to just replace the ALT . And why tapping it, makes it work ? . also my small auxiliary air-compressor is shot. what should i do to maybe upgrade it ? . thanks all  :)   
1992 U300 Anniversary Edition wrong color DDC6v92T Big step up from my 1983 35' fc Blue Bird .

Re: alternator not charging

Reply #1 –
I'd start off by disconnecting the batteries and checking for corrosion or loose terminals on back of alternator, and where these wires connect to the coach.  It's normal for the alt to heat up in operation when charging hard.  Sounds like you have an intermittent connection.
"Not so  long ago we were a nation of risk takers, riding five million pounds of  thrust straight into space."  Joe Gresh
Chuck Pearson
1996 U295
2018 Can Am X3 TurboRS

Re: alternator not charging

Reply #2 –
Quote from: Chuck Pearson –
I'd start off by disconnecting the batteries and checking for corrosion or loose terminals on back of alternator, and where these wires connect to the coach.  It's normal for the alt to heat up in operation when charging hard.  Sounds like you have an intermittent connection.
Will do Chuck thanks....
1992 U300 Anniversary Edition wrong color DDC6v92T Big step up from my 1983 35' fc Blue Bird .

Re: alternator not charging

Reply #3 –
Also, pay particular attention to the small sense wire-- at both alternator and battery isolator ends.  Much easier to break/come loose than the large B+ or other larger gauge wires.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020
 

Re: alternator not charging

Reply #4 –
Your slip ring brushes may be worn or sticking
Peter and Frieda Morin
1999 36ft. U320 Foretravel
Build # 5436
1998 Suzuki Sidekick Sport