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

You ran a new wire from what to what?

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 ?!

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?

http://www.gmtuners.com/fil...o_L67_PCM_wiring.pdf clear 61

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.

Spoon

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"Kilgore Trout once wrote a short story which was a dialogue between two pieces of yeast. They were discussing the possible purposes of life as they ate sugar and suffocated in their own excrement. Because of their limited intelligence, they never came close to guessing that they were making champagne." - Kurt Vonnegut

the wire I used as a "replacement" is a little bigger gauge, not much,