Precisely why I said that since the OP's light is not on when the key is turned and the alternator isn't charging until rev'd up to past 3000, the exciter (aka charging) circuit has a fault somewhere due to the way the circuit works.CalAltaDubber wrote:but the battery light should be illuminated when the key is in the ON position and the engine is not running. Simply because the alternator is not turning and not charging the battery.
The only difference in this circuit between the years with CE1 panels (1983-1993) is the OXS warning light and counter box (1988+ do not have the light and counter box). All years' charging circuits use a blue wire and is routed thusly:CalAltaDubber wrote:Actually the year of the vehicle does matter, as we are aware, there are different wiring diagrams for diferent model years. Even though the charging system operates the same, there may be suttle wiring diferences. Therefore to make sure the correct data is used, the correct diagrams for the car must be used.
Like I said, I am going to research the circuit and confirm it on my cars (both known servicable), since the '87 and '88 use the same diagrams, they should both be the same.
D+ on alternator > single pin connector near battery > into relay panel at C2 > out of relay panel at A16 > into instrument cluster at pin 12.
Those with OXS lights: The circuit also leaves the panel at D4 and goes to the counter box, which continues to the instrument cluster at pin 10. This is why the OXS light is also on with charging light until the engine is rev'd.
The 1980-1982 cars: The blue wire goes from the D post on the alternator directly to the instrument cluster, bypassing the relay panel (and also ties directly into the OXS warning light). The early cars have a simpler system wiring-wise, but still works the same way.