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taufik
Active Contributor

Join Date: Aug 2008
Posts: 19

alternator

12/24/2009 5:02 AM

merry crismast

dear cr4

i buy new delco remmy alternator type 300 who have voltage 24vdc but when iam use in my engine the out put is 15 vdc ,are something rong with my new alternator or other
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woodygb
Power-User

Join Date: Mar 2009
Location: United Kingdom
Posts: 308
Good Answers: 28
#1

Re: alternator

12/24/2009 9:26 AM

A 12volt alternator has an output of between 13.5 and 14.8 volts ....so i'd suspect that you have purchased a 12v alternator.

Regards Woody
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bwrench
Commentator

Join Date: Aug 2009
Location: Leavenworth, Washington
Posts: 77
Good Answers: 13
#2

Re: alternator

12/25/2009 10:40 PM

By any chance did you get this 24 volt reading with the B+ wire unhooked from the alternator while you had the engine running? If so, there is a good chance that you have ruined some of the diodes in the alternator. Most alternators will charge between 13.8 volts and 14.8 depending on the battery temperature and the ambient temperature. Never unhook a battery or alternator when the engine is running. You can get some very nasty voltage spikes that will ruin all kinds of electronic devices.

__________________
 Test first, replace parts later
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