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This is on my '87 Formula which I recently acquired. It has some electronic gremlins I'm trying to work through.
Okay, the alternator.
12.5 V on battery, 12.5 V when car is started, 11-ish when under load , (lights, fan, radio). All connection look good. Seems like the alternator is bad. But before replacing or rebuilding I take it to the parts store for testing and it passed.
So either the parts store testing isn't picking something up like a bad regulator or something? Or my problem is not with the alternator.
Post an Image of the Alternator showing the Electrical Connector...
Lets see what the Wires from the Connector are connected to, because it seems that the Alternator is not "Exciting"...
The Voltage Regulator Circuit may not have the correct connection.
Post an Image of the Alternator showing the Electrical Connector...
Lets see what the Wires from the Connector are connected to, because it seems that the Alternator is not "Exciting"...
The Voltage Regulator Circuit may not have the correct connection.
I think this is related to your Choke Light issues:
I think the above is for 1985 as it matches my 1985 manual, but we know there are some differences with your 1987. However, if you're missing the circuit between the ignition switch and alternator then it will not excite at idle and the choke light will not operate correctly. This would be why the alternator is not charging in your car but passes the test at your parts store.
Originally Posted by chazman
This is on my '87 Formula which I recently acquired. It has some electronic gremlins I'm trying to work through.
Okay, the alternator.
12.5 V on battery, 12.5 V when car is started, 11-ish when under load , (lights, fan, radio). All connection look good. Seems like the alternator is bad. But before replacing or rebuilding I take it to the parts store for testing and it passed.
So either the parts store testing isn't picking something up like a bad regulator or something? Or my problem is not with the alternator.
I think this is related to your Choke Light issues:
I think the above is for 1985 as it matches my 1985 manual, but we know there are some differences with your 1987. However, if you're missing the circuit between the ignition switch and alternator then it will not excite at idle and the choke light will not operate correctly. This would be why the alternator is not charging in your car but passes the test at your parts store.
It depends. The digital cluster used a hidden bulb that acted as a resistor. In the analog setup, like yours, I believe it's just a resistor wire.
The alternator not charging could be why your Choke Light is on while running. This is also why I asked about that previous post where you said you needed a jump while out driving, as that would not be normal if the alternator was charging and you didn't shut off the vehicle. The alternator needs to put out voltage to kick the choke heater relay off (electrically) and turn off the choke light. These issues are most likely related but finding out exactly the fault is difficult, especially without the proper 1987 manual or diagram. There's a lot more knowledgeable people that probably have the answer.
Post an Image of the Alternator showing the Electrical Connector...
Lets see what the Wires from the Connector are connected to, because it seems that the Alternator is not "Exciting"...
The Voltage Regulator Circuit may not have the correct connection.
Tell me more about this exciter wire. The new alternator does not appear to be charging.
CS130? If so the battery is likely weak. Which in time will take out the alternator.
RBob.
Boy, that would be so easy if it was simply a bad battery. But it tested fine at home on my meter and fine at the parts store. Maybe I'll swap batteries with another car and see what's what.
06-25-2023, 05:54 PM
