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1985 CRX Alternator

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1985 CRX Alternator

Postby truxson » Sun Jun 10, 2018 6:48 pm

Folks...I wonder if anyone has this problem or have heard of it....I have a noisy alternator on my 85 CRX. Bad bearings I assume. So I went to the yard where we have parts cars and took one off a very rusty car. I took it to a local big box parts retailer to have it checked. The first one couldn't do it....too old. The second one ran a test on the alternator and then condemned it because it failed something called a 'sense terminal' test. Years ago when I was in school, we rebuilt alternators all the time. I don't remember anything called a sense terminal. Can anyone enlighten me as to whether this test is even valid on an alternator this old?

Regards, David.
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Re: 1985 CRX Alternator

Postby windraver » Tue Jun 26, 2018 6:14 pm

truxson wrote:Folks...I wonder if anyone has this problem or have heard of it....I have a noisy alternator on my 85 CRX. Bad bearings I assume. So I went to the yard where we have parts cars and took one off a very rusty car. I took it to a local big box parts retailer to have it checked. The first one couldn't do it....too old. The second one ran a test on the alternator and then condemned it because it failed something called a 'sense terminal' test. Years ago when I was in school, we rebuilt alternators all the time. I don't remember anything called a sense terminal. Can anyone enlighten me as to whether this test is even valid on an alternator this old?

Regards, David.

I never heard of it before but heres what google told me:
https://jasoceania.co.nz/articles/alter ... -explained

Alternators often have several connection terminals, each with their own specific function. When fitting like for like there's no issue, but somnetimes you need to wire something up, or adapt a unit to fit an application... so what is what?

The following information is presented as a guide when wiring and troubleshooting alternators. You can download it here

Terminal Definition Notes
A BATTERY Comes from the word ‘Accumulator’
B BATTERY Main Battery Feed
B+ BATTERY Main Battery Feed
C CENTRE Neutral, ‘Half-Voltage’, centre point of a Y-connected stator
COM COMPUTER Computer Communication
D+ WARNING LIGHT Comes from the old ‘Dynamo Positive’ on a generator
DFM DYNAMO FIELD MODULATION Duty Cycle signal from the ECU
E WARNING LAMP Comes from the word ‘Excitation’
F FIELD Normally found on Externally Regulated units
FR FIELD REGULATION Voltage Signal from the ECU
G GROUND Chassis of the vehicle
I INDICATOR Warning Lamp
L LAMP Warning Lamp
M FIELD Normally found on older Externally Regulated units
N NEUTRAL Neutral, ‘Half-Voltage’, centre point of a Y-connected stator
P PULSE Stator Pulse. Used for rev-counters
R RELAY Output to charge relays, electric choke, etc
S SENSE Battery Voltage sense wire
S (FORD) STATOR Stator Pulse. Used for rev-counters
T TACHO Stator Pulse. Used for rev-counters
W WAVEFORM Stator Pulse. Used for rev-counters
I just noticed I'm never playing by the rules
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Re: 1985 CRX Alternator

Postby truxson » Sun Jul 01, 2018 12:32 pm

Thanks for the information. That's a lot more than I knew before.

I installed the alternator...and the girl was right, it didn't charge. So....I sent it out to the rebuild shop to see what they could find out about it.

Regards, David.
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