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- From: bsmith@hplvec.LVLD.HP.COM (Brian Smith)
- Date: Wed, 18 Nov 1992 00:50:48 GMT
- Subject: Re: A Charging Question
- Message-ID: <2670168@hplvec.LVLD.HP.COM>
- Organization: Hewlett-Packard Co., Loveland, CO
- Path: sparky!uunet!charon.amdahl.com!pacbell.com!sgiblab!sdd.hp.com!hpscit.sc.hp.com!scd.hp.com!hpscdm!hplextra!hpfcso!hplvec!bsmith
- Newsgroups: rec.boats
- References: <1e8nc9INN5gi@morrow.stanford.edu>
- Lines: 22
-
- In rec.boats, bennett@erich.triumf.ca (P.Bennett) writes:
-
- An alternator requires some field current, drawn from the battery, in order to
- work, so I would not be surprised to see no output with no battery connected.
- Once the alternator is running it will supply it's own field current, and, if
- the battery is then disconnected, the output voltage may rise so high that the
- rectifier diodes will be destroyed. With a battery connected, the battery
- serves as a sufficient load to hold the voltage within safe limits.
-
- With the battery connected, and the engine running, you should see about 14.2
- volts if the battery is near full charge, less if the battery is low.
-
- Peter, are you saying that if I connect a battery, start the engine,
- and then disconnect the engine, that I might blow tha alternator? I
- don't think there is anything in the manual for the outboard under
- discussion that says this, but I will certainly check. Also, if what
- you say about the lack of output voltage is correct, then my advice to
- Fido (or was it Felix this time?) was wrong--especially the bit about
- talking to his EE department, since it was an EE I went to for advice
- in the first place:-)
-
- Any definitive answers out there?
-