That isn't an ammeter light, it is the Battery light it detects voltage on Battery start and lights up because it is a higher voltage than what the alternator puts out. At the Same time the Alternator is fed a Tickler (or Exciter Voltage) via that light to tell the Alternator to Start a Field and then charging starts.
If that Light is on, and doesn't flicker then you have to make a Guess that your car is not charging the battery, and that you are running off the battery.
On your alternator there is a plug that has 3 wires. Two are 12V lines to the battery, the third is the Exciter wire that feeds directly back to the Instrument cluster.
(Blue wire in).
When the blue wire in has a Charge, then your led is reversed biased by the Higher voltage output of the alternator than the battery in and turns off. There is also a Diode in the Circuit of the lamp that takes the Reverse bias and turns off the Battery light.
So, have you had your alternator tested?
I would ring out the wire from the Alternator Plug Blue wire, to the Dash Connection to verify that it is intact or has a short between both connectors.
If the Alternator or Voltage Regulator checks out. Then you are looking at a possible bad Ground on the Instrument cluster, or a bad diode, as we know that the light works.
I would also have your Battery tested, and of course the Ubiquitous if you haven't replaced your battery to Frame and frame to engine ground now would be a good time to do it, as well as adding a ground from the engine block bolt to the Case nut on the alternator.
If that Light is on, and doesn't flicker then you have to make a Guess that your car is not charging the battery, and that you are running off the battery.
On your alternator there is a plug that has 3 wires. Two are 12V lines to the battery, the third is the Exciter wire that feeds directly back to the Instrument cluster.
(Blue wire in).
When the blue wire in has a Charge, then your led is reversed biased by the Higher voltage output of the alternator than the battery in and turns off. There is also a Diode in the Circuit of the lamp that takes the Reverse bias and turns off the Battery light.
So, have you had your alternator tested?
I would ring out the wire from the Alternator Plug Blue wire, to the Dash Connection to verify that it is intact or has a short between both connectors.
If the Alternator or Voltage Regulator checks out. Then you are looking at a possible bad Ground on the Instrument cluster, or a bad diode, as we know that the light works.
I would also have your Battery tested, and of course the Ubiquitous if you haven't replaced your battery to Frame and frame to engine ground now would be a good time to do it, as well as adding a ground from the engine block bolt to the Case nut on the alternator.