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WHY is this doing this ? by Lou6t4gto
Started on: 12-06-2014 06:52 PM
Replies: 6 (372 views)
Last post by: Lou6t4gto on 12-11-2014 01:59 PM
Lou6t4gto
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Report this Post12-06-2014 06:52 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post
My 1987 GT 3800SC swap. Last week my alternator was not charging, (Stock 1997 Riviera alternator), the problem was it was not getting "Powered" by 61 Clear from the ECM. I ran a new wire, and now it Charges at 14-15 volts. today it's still charging at 14-15 BUT, now the VOLT LIGHT is On all the time ! What am I "Missing" ? Thanks
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Gall757
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Report this Post12-06-2014 07:54 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
You ran a new wire from what to what?
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Lou6t4gto
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Report this Post12-07-2014 01:18 AM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post
From the ECM plug (Clear 61) to the small wire plugged into the back of the alternator. (the way it is supposed to be, the way it originally was.) Don't know why it wasn't getting enough current through the original wire. why would the Light go on if it IS charging ? I thought it goes on if it's NOT charging ?!
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Stubby79
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Report this Post12-07-2014 03:24 AM Click Here to See the Profile for Stubby79Send a Private Message to Stubby79Edit/Delete MessageReply w/QuoteDirect Link to This Post
Is that how it's supposed to be hooked up in the Riviera? I don't believe the original Fiero ECM controlled the alternator(But don't quote me on it) Here's a wiring diagram...

That would suggest to me that the wire you ran bypassed the light, and it is normally grounded. The light will stay off if both sides (both wires going to and from it) are positive (+12v), because there's no where for the power to go.

I'd start by checking the wire you ran and see if it's got +12v or 0v difference between it and ground, and or between it and a "hot" (+12v from the battery) wire, when running and or when the ignition is in the "on" position.

Was all well before it stopped charging recently? Does your system read +14v all the time when running now, or does it taper off once it's been running for a while?
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Lou6t4gto
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Report this Post12-07-2014 12:29 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post
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Spoon
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Report this Post12-08-2014 08:48 PM Click Here to See the Profile for SpoonSend a Private Message to SpoonEdit/Delete MessageReply w/QuoteDirect Link to This Post
Did you run the same gauge wire & length? If not, try that and see what you get. Also check the bulb type/size and see if its different than the one used for that new alternator. I'm grabbing straws here but I had a similar situation when upgrading my alternator. Can't remember all the details, perhaps I should write some of these things down.

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Lou6t4gto
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Report this Post12-11-2014 01:59 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post
the wire I used as a "replacement" is a little bigger gauge, not much,
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