Alternator wiring help

[rot8ondis]

I have just fitted a big EA falcon alternator to my 4k powered KP61 which was already running an internal voltage regulated alternator.

The original wiring to to the car has L (which should go to charge lamp), S (which is voltage sense) and Ig (which is ignition and tells the alt to charge when ign is on).

The plug on the new alternator only has L and S where the L dosnt seem to be the feed for the charge lamp as I have to hook it up to the Ig to get it to charge (only way it will work is with the S to S and L on the alt to Ig on the wiring).

This has left me without a feed to the charge lamp and my dash lights on constantly

How can i fix this to get it all working correctly???

[jakesae101]

read this http://www.toymods.net/forums/showthread.php?t=18916 pretty much explains it all

[matt dunn]

Did you end up with a bosch alternator or a mitsi alternator, as the falcon's have both.

You should have S to S and L to L and have ign wire spare.

If you do that and have no warning light, the alt is faulty.

(provided the warning light circuit in the car is ok)

[rot8ondis]

read this http://www.toymods.net/forums/showthread.php?t=18916 pretty much explains it all

Yes i have that exact same 85a alternator. If i wired it up how he says, it wouldnt work.

Did you end up with a bosch alternator or a mitsi alternator, as the falcon's have both.

You should have S to S and L to L and have ign wire spare.

If you do that and have no warning light, the alt is faulty.

(provided the warning light circuit in the car is ok)

Yes i have S to S but the L on the alternator needs to go to the ignition or it wont charge.

[matt dunn]

[

Yes i have S to S but the L on the alternator needs to go to the ignition or it wont charge.

Well then either the warning light circuit in the car does not work,
or the current through the bulb is not enough to trip the alternator.


If you hook up the L to the L, what happens?
The light stays on? The light doesn't come on at all?

If you earth the L wire on the car does the light on the dash come on?

[rot8ondis]

Well then either the warning light circuit in the car does not work,
or the current through the bulb is not enough to trip the alternator.


If you hook up the L to the L, what happens?
The light stays on? The light doesn't come on at all?

If you earth the L wire on the car does the light on the dash come on?

The warning lights all seemed to be working as they let me know the old alternator had stoped charging (had blowen a diode).

They stay on whether the L is disconnected, ground or connected directly to the L on the Alt (but will not charge like this).
But I have just found out that the alt will only run (charge) once its L has been triped with the Ignition wire. So if disconnected and i start her up, i just need to touch the wires together and the alt will load up and start charging at a solid 14.3 volts, then i can dissconect them. with only the S connected.

If i then put the L to the L, the charge light still remains on. the only way i can make it go off is buy connecting it to power (S wire or Ig) but this wont be running it like it should, just constantly.

[matt dunn]

They stay on whether the L is disconnected, ground or connected directly to the L on the Alt (but will not charge like this).

Then you have a fault in the warning light circuit.

If the alternator light in on with the alternator wiring unplugged
then the car is not wired right.

That is why the alt will not charge with that connected, as the car is earthing out the field current.

The car would have been external reg originally,
how was it changed? did they remove the old reg completly?

[rot8ondis]

Yes you are probably right about that as the car has had a lot of the wiring mucked around with probably when it was converted to EFI.

Kp starlets only ever came with external votage regs so it has been converted over (most likely wrong) but it was working as it should with the old alternator hooked up with the Ig as well.

I assume it was wired up as you normally would when you put a internal reg alt in with 4ages etc but have very little knowledge with wiring and would struggle trying to trace and rewire it all.

[matt dunn]

Well your options are to run with the ign wire connected and no alternator light working

or get someone who know what they are doing to fix it.