Author Topic: Alternator and charge indicator  (Read 344 times)

SoupMan

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Alternator and charge indicator
« on: August 31, 2018, 11:06:09 PM »
Hi,

The new power master alternator I'm planning on installing has a tech note saying that on 3 wire installation, a diode should be installed if the vehicle does not have a charge indicator.

My first question: in my 1980 Firebird, at the top of the speedometer, their appears to be a blue square that can light up. Is this a charge indicator?  I tried to shine a light but could not make up any symbols.

My next question is: If not, what is recommended in regards to installing a diode?  The reasoning appears to be that it would prevent damage to the voltage regulator inside the alternator.

Any advice is appreciated.
« Last Edit: August 31, 2018, 11:07:58 PM by SoupMan »

firebirdparts

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Re: Alternator and charge indicator
« Reply #1 on: September 03, 2018, 04:50:15 AM »
I've never heard of that installation being required, but I think you don't have a charge indicator and you want to just put the diode in where they say to, in the original factory wire.

The light at the top of the speedometer is high beams.
I want to be like Paul Kenny when I grow up
Joe Bays
1977 Y82 4-speed (red interior)
1978 Skybird 350
1978 Redbird 305
1979 Redbird 301 4-speed
1992 Lincoln Mark VII LSC/SE (red)
1970 Datsun Pickup
1953 Chevy pickup (converted 4x4)
1988 T-bird Turbo Coupe

Jack

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Re: Alternator and charge indicator
« Reply #2 on: September 03, 2018, 06:29:02 AM »
Cars without rally gauges came with warning light, is this what you are planning to install? It's a good idea if you don't have a voltmeter otherwise you don't need it.




Regards, Jack

SoupMan

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Re: Alternator and charge indicator
« Reply #3 on: September 03, 2018, 06:43:13 PM »
Other than it gives you a clear visual that something is working/not working, there's something about voltage feedback into the alternator. I'm trying to find the article I read on my phone 2 days ago that explained that most modern alternators have internal protections but that those who don't can end up damaging their voltage regulator.

I'll wire a 194 in line as per manufacturer instructions just to be on the safe side.

Jur5664

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Re: Alternator and charge indicator
« Reply #4 on: September 07, 2018, 07:31:13 AM »
at the top of the speedometer, their appears to be a blue square .

It is the light for high beam when they are on  :P

Re: Alternator and charge indicator
« Reply #4 on: September 07, 2018, 07:31:13 AM »

Aus78Formula

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Re: Alternator and charge indicator
« Reply #5 on: September 07, 2018, 07:47:12 AM »
 :lol:       so.....not a sign of battery drain when high-beams are on?!

Jur5664

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Re: Alternator and charge indicator
« Reply #6 on: September 09, 2018, 04:10:14 AM »
:lol:       so.....not a sign of battery drain when high-beams are on?!

No

Aus78Formula

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Re: Alternator and charge indicator
« Reply #7 on: September 09, 2018, 04:19:10 AM »
not the place for rhetoric then

mlewisariz

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Re: Alternator and charge indicator
« Reply #8 on: September 09, 2018, 10:24:15 AM »
The note says if "not" using a charge indicator. I think a voltmeter, ammeter, or idiot light would qualify as charge indicators.
Old enough to know better, but still on the gas.

hakitup

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Re: Alternator and charge indicator
« Reply #9 on: September 09, 2018, 11:36:24 AM »
If I remember right the alternator exciter wire is keyed power that goes through the indicator and once the alt starts charging it makes both sides positive and the light goes out.

Tom H
"I don't know what you call it, I only know the sound it makes when it lies!!"

firebirdparts

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Re: Alternator and charge indicator
« Reply #10 on: September 09, 2018, 04:50:04 PM »
The note says if "not" using a charge indicator. I think a voltmeter, ammeter, or idiot light would qualify as charge indicators.

That's not what they mean.
I want to be like Paul Kenny when I grow up
Joe Bays
1977 Y82 4-speed (red interior)
1978 Skybird 350
1978 Redbird 305
1979 Redbird 301 4-speed
1992 Lincoln Mark VII LSC/SE (red)
1970 Datsun Pickup
1953 Chevy pickup (converted 4x4)
1988 T-bird Turbo Coupe

mlewisariz

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Re: Alternator and charge indicator
« Reply #11 on: September 10, 2018, 10:39:19 AM »
Well,my bad. What is a "charge indicator" and why do you need one?
Old enough to know better, but still on the gas.

mlewisariz

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Re: Alternator and charge indicator
« Reply #12 on: September 13, 2018, 11:08:07 AM »
firebirdparts, I wasn't being snarky, I was actually asking what & why about "charge indicator". Anyone have explanation?
Old enough to know better, but still on the gas.

firebirdparts

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Re: Alternator and charge indicator
« Reply #13 on: September 14, 2018, 06:18:36 AM »
They mean that 1 wire in a 3 wire alternator has a lamp in it.  That is a common type of charge indicator.  I never heard of this diode requirement, so I am not sure what the deal was, but it was totally an assumption on my part that they meant if there's not a lightbulb in this particular circuit, then you need to put this diode in that same wire.  I may be wrong about what they are saying.
I want to be like Paul Kenny when I grow up
Joe Bays
1977 Y82 4-speed (red interior)
1978 Skybird 350
1978 Redbird 305
1979 Redbird 301 4-speed
1992 Lincoln Mark VII LSC/SE (red)
1970 Datsun Pickup
1953 Chevy pickup (converted 4x4)
1988 T-bird Turbo Coupe

Re: Alternator and charge indicator
« Reply #13 on: September 14, 2018, 06:18:36 AM »
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