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Alternater not charging

For all things Electrical.

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Alternater not charging

Post by 4sum4 »

Ok Alternater is not charging I replaced it with a spare i had still not charging,Replaced that with one from a wrecker still didnt charge and wrecker replaced with one that did new that worked and not charging either
Its a three prong plug(Black,Green and a larger Blue one) and 1 main charge wire
what can i check to see whats going on
[url=http://downunder4x4.net/forum/showthread.php?t=1650]86 Hilux[/url]
and a 84 extra cab



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DamTriton
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Post by DamTriton »

The battery???

Could be stuffed.....
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Post by 4sum4 »

The battery will be fully charged but when you start the vehicle the charge starts to drop
[url=http://downunder4x4.net/forum/showthread.php?t=1650]86 Hilux[/url]
and a 84 extra cab



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Post by ozy1 »

do the toyotas have an external regualtor, maybe its stuffed and not sensing the battry voltage, thus not charging
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Post by macca81 »

check earths
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Post by nayto »

im with Damkia, load test the battery with a tester or check with mutimeter whilst crankin, but even if the alternators tryin to charge, if u have a dead battery it will still look to be dropping voltage
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Post by simkell »

does the battery light come on with the ignition key turned to the on position.
is there a short in the power wire to and from battery and alternator.
also do check earth.
nothing as silly as a charging fuse? what car is it?
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Post by want33s »

Probably the regulator on the passengers side inner guard.
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Post by djroberts »

chances are its your battery, most systems require an excitation from the battery to bring the alternator online. i dont know if youve checked that but i presume you would have before asking for help.

other than that, yeah, check fuses. trouble shoot with a multi meter - look for an online elec manual. think also, have you touched anything recently that could have screwed this up? dual batteries? winch? did you forget to connect a wire? (like i did once).

let us know how you go, by the way, what car is it 'coz i have a few factory manuals here and might be able to help you further with trouble-shooting

-Dave.
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Post by 4sum4 »

checked all the earths ther fine,Put a brand new Battery in and also ran a wire from the alternater straight to the battery, Started it and it sat on 12.78 V turned the High beams on and it went to 12.20 volts then went back to 12.78V when there off,The volts never went up so still not charging,The truck is a standard 84 Hilux
[url=http://downunder4x4.net/forum/showthread.php?t=1650]86 Hilux[/url]
and a 84 extra cab



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Post by 4sum4 »

Just hooked up an 85A off a VN commodore and now charging :armsup: Only took me 3 hours ,Got my money back from the new battery and got a dual battery system :armsup: .

Image

Image

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I ran a charge wire straight from the alternater to the battery with no fuse,doe anyone now about these fuses?
http://cgi.ebay.com.au/ws/eBayISAPI.dll ... :IT&ih=021
[url=http://downunder4x4.net/forum/showthread.php?t=1650]86 Hilux[/url]
and a 84 extra cab



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