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charging issues

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charging issues

Postby magicdeo » Mon Jan 16, 2023 8:33 am

Hi, my 4JB1 rodeo has recently started staying at about 12.8v after the first start of the day for about 2 minutes before it goes up to 14v. The other night I noticed that it had dropped to 12.9V for maybe 3 minutes or so before increasing to 13.5V and stayed at 13.5 for 45 minutes. The next morning it was back to 14 - 14.1V. It normally runs at about 13.9 or 14 at night with lights on. No idea how old the altenator is but I know it hasnt been touched for atleast 200,000kms. Whats the best bet, new brushes/new alternator/full rebuild of old one? Just looking for ideas.

Cheers
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Re: charging issues

Postby geeves » Mon Jan 16, 2023 10:16 am

What does it do if you give it a quick rev when it sticks low? Based On the info so far my money is on the charge relay although the alternator might need a service
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: charging issues

Postby magicdeo » Mon Jan 16, 2023 12:56 pm

No, the volts don't change with revs at all. The charge relay isn't very old.
magicdeo
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Re: charging issues

Postby geeves » Mon Jan 16, 2023 1:13 pm

Are you rellying on the volt meter in the car or a good multimeter. What you are saying is that it sounds like the alternator but its better to eliminate all other options first
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: charging issues

Postby magicdeo » Thu Jan 19, 2023 8:25 pm

I used a fluke multimetre for all testing.
I put a new altenator in today (OEX HXA081) and its charging perfectly. The problem I have now is that the motor wont turn off with the key. Anyone had this issue? All I did was put a new altenator in.

Thanks
magicdeo
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Country: Australia
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Vehicle: 1997 Holden Rodeo

Re: charging issues

Postby geeves » Fri Jan 20, 2023 5:25 pm

genuine or genuine equivalent alternator? I have heard of this problem when people fit other alternators where the aircon sits. A diode fixes it but it shouldnt occur if oem used
Sanding your knuckles before starting work can help. That way you cant skin them
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geeves
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