SailNet Community - View Single Post - Starter verses Alternator
View Single Post
  #2  
Old 10-10-2006
capn_dave's Avatar
capn_dave capn_dave is offline
Seinor Member
 
Join Date: Feb 2000
Location: Green Cove Springs, FL
Posts: 276
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 15
capn_dave is on a distinguished road
I doubt it's the alternator

Where are you reading the battery voltage? On your electrical panel or on the instrument panel? Dose the key have to be on to read the voltage? Did the new battery read 10 volts? Did you run the engine and check the voltage while running?
While cranking the voltage will drop, as the alternator is not charging at this point and the starter is drawing allot of current. Most alternators will not start charging until they get to a certain rpm. For sake of argument about 1000 engine rpm then once excited will continue charging even at idle. When the alternator is charging and the engine reved up a bit you should be seeing around 14 volts.

Fair Winds

Cap'n Dave

Last edited by capn_dave; 10-10-2006 at 06:46 AM.
Reply With Quote Share with Facebook