Thread: Alternator

As in variable current output? If so, yes all alternators will produce what ever current is needed to supply the load.
If you're thinking about the regulator, it's job is to control the output voltage. All alternators have these too.

Cheers
Tom

Ok,
Variable output rather than a constant output?
My understanding is older vehicles have constant output & newer have variable type.
Just need to know which type is in my Puma?

David

I have a voltmeter plugged it to mine and after start up it sits on about 14 volts and rarely varies much.

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Originally Posted by Witchdoctor

Ok,
Variable output rather than a constant output?
My understanding is older vehicles have constant output & newer have variable type.
Just need to know which type is in my Puma?

David

Unless I'm misunderstanding your question, what Beery says is correct.

The alternator regulator circuitry is designed to match the output of the alternator to the load - within reason. Obviously a dead short will risk damage, but within the range of RV usage the alternator will supply what is needed up to its own limit.

There is usually plenty of output to run headlights, driving lights, & all the normal electrical loads experienced during running as well as keeping the battery charged.

This means that the alternator would have to be described as having "variable output". A constant output regardless of load would do damage to the battery & electrical system.

Alternators have been as described for as long as I can remember.

Cheers,

Lionel

Originally Posted by Witchdoctor

Ok,
Variable output rather than a constant output?
My understanding is older vehicles have constant output & newer have variable type.
Just need to know which type is in my Puma?

David

I think I get what you're asking now. The ECU monitors whats going on and controls the alternator output on these new engines.
I dont really understand the need (or exactly how it does it) because a simple regulator will maintain the output voltage at around 14v as the current draw fluctuates.

All charging systems are variable. If they were constant you would have a very melted battery Having said that it is the regulater, in various guises, that controles that has the say in how much charge is allowed.
Cheers Scott