Converting to new Alternator?

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Not-a-Number
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Re: Converting to new Alternator?

Post by Not-a-Number » Wed Oct 02, 2013 3:49 pm

Stupid honda!

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Re: Converting to new Alternator?

Post by nz_climber » Wed Oct 02, 2013 8:57 pm

Any of the 4a or similar corollas would be fine too, I ditched my altezza 120A one because it was just too big and got a 60A alternator from a 4afe - more than enough for our little cars!

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Re: Converting to new Alternator?

Post by Not-a-Number » Thu Oct 03, 2013 3:56 pm

Sweet theres heaps of those at my pick a part. From my reading it looks like the honda ones are internally regulated but have a low charge mode at 12.5v that is activated when idling and starting up so there is less drag and less emissions. Sounds pointless to me, so I can just have it in high charge mode all the time by grounding one wire.

What im not sure about is what happens when its fully charged. If its internally regulated and shuts down then fine but what if the computer usually monitors voltage/current and turns it to low charge mode.

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Re: Converting to new Alternator?

Post by Not-a-Number » Tue Oct 08, 2013 8:55 pm

So I got a Toyota alternator in from a 2L corona. At idle it sits at 12v over 1500rpm it's at about 14.4v.

What is the max voltage I should see?

What I've noticed it if I have my headlights on at heaps of revs itl only go as high as 14.4V but as soon as I turn my fan on and over 3500 revs itl read 15.4V.

Sounds high. Is that expected with maximum load and heaps of revs?

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Re: Converting to new Alternator?

Post by ibreadmore » Tue Oct 08, 2013 9:17 pm

At standard load you shouldn't see more than 14.7v. Not sure about full load or idle!
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Not-a-Number
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Re: Converting to new Alternator?

Post by Not-a-Number » Tue Oct 08, 2013 9:28 pm

Idle you are meant to see low voltage. Don't need many revs for it to start to climb and then sits at 14.4ish at over 1500 revs. I can do 6500 revs with headlights on and itl stay at 14.4 but then if the fan comes on itl stay at 14.4 until I get to 3-4000 revs when it jumps to around 15.5 and stays there.

Iv read over 15 is bad but that was just talking about no load

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Re: Converting to new Alternator?

Post by bzrse7en » Wed Oct 09, 2013 7:35 am

It might just a bit of electrical noise generated by the fan motor. The volt meter might be averaging out a few spikes.
It is probably all good.
You could put a capacitor on the fan to see if it makes a difference.

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Re: Converting to new Alternator?

Post by Not-a-Number » Wed Oct 09, 2013 8:11 am

That is a good point but I can hear my fuel pump scream louder when it jumps to 15.5v (thats how I noticed it) so there must be more electrons going around somewhere.

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