80 Series alternator / charging voltage ?

Submitted: Monday, Jul 12, 2010 at 19:58
ThreadID: 80033 Views:7374 Replies:4 FollowUps:3
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Can anyone tell me what voltage I would expect from the alternator on a 1994 1HZ 80 Series (base model)?

I recently installed an Aux battery (deep cycle) with a Baintech VSR and a National Luna dual battery monitor. I have not had starting problems with its original setup, or since I have put in the dual battery. However, since installing the monitor I am concerned because the instructions stated that if it did not show all 4 green lights (indicating 14.2v) it was not charging properly. I put the multi-meter on it this evening, and the most I saw it output was about 13.85v at the (main) battery terminal where the alternator is connected. I tried running the batteries down a little to make it do some work, and it still did not go above about the same voltage. Is this normal for the old 80 series alternator, or is it showing some fatigue after all these years?

Any help would be appreciated.

Regards,

Matt
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Reply By: Member - Tour Boy ( Bundy QLD) - Monday, Jul 12, 2010 at 20:22

Monday, Jul 12, 2010 at 20:22
Hi Matt,
the 1HZ are usually around the 60amp right thru the range
the petrols up to Aug '92 were 60 amp
the petrols after sept '92 were 100 amp

I don't know if the petrols and diesels share the same plug and alternator case to mix and match.
Cheers
Dave
Cheers,
Dave
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AnswerID: 423837

Follow Up By: Member - Tour Boy ( Bundy QLD) - Monday, Jul 12, 2010 at 20:25

Monday, Jul 12, 2010 at 20:25
Mine have been up to 14.6V whether flat or full
Cheers,
Dave
2010 Isuzu FTS800 Expedition camper
2015 Fortuner
Had 72 cruisers in my time

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Reply By: Member - Phil G (SA) - Monday, Jul 12, 2010 at 21:43

Monday, Jul 12, 2010 at 21:43
I've measured my daughter's 1997 model HZJ80.
After the glow plugs have dropped out it gets up to 14.6V at about 2000rpm in cool weather.
At idle, it often drops to a similar reading to yours.

You need to measure the voltage continuously while you're driving, or at least with the motor revving at say 2000rpm. I think you'll get a higher reading if you do this.
AnswerID: 423840

Reply By: Member - Crazy Dog (QLD) - Monday, Jul 12, 2010 at 21:54

Monday, Jul 12, 2010 at 21:54
Check this from the Genuine 80 series Toyo manual mate:

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AnswerID: 423842

Reply By: Dennis Ellery - Monday, Jul 12, 2010 at 22:13

Monday, Jul 12, 2010 at 22:13
My 2008 Troopy V8 diesel puts out about 13.9/14 volts cold and when the motor warms up it drops to 13.5/13.6
AnswerID: 423844

Follow Up By: Member - Wayne B (NSW) - Monday, Jul 12, 2010 at 23:18

Monday, Jul 12, 2010 at 23:18
The charging voltage for any 12V system should be 13.9 to 14.2 Volts
A charge voltage over 14.2 can boil the battery.

Cheers
Wayne
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FollowupID: 694292

Follow Up By: mechpete - Tuesday, Jul 13, 2010 at 17:55

Tuesday, Jul 13, 2010 at 17:55
I,m with you wayne .
when I did my apprenticeship it was 13.9/14.2 v
and its still the same .
what is so hard to understand .
mechpete
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FollowupID: 694365

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