Need help to wire B18C alternator with a Haltech!!!!

**39erman** · 23-02-2015 06:26 PM

Ok, so it has 4 terminals:

B = battery +ve
IG = switched +ve
L = light
C = ?.. Goes to factory ECU. Do I just tie this to +ve battery?

**ECU-MAN** · 24-02-2015 06:58 AM

C = ALT C that goes to the ECU, You can probably leave it disconnected.

**39erman** · 24-02-2015 09:27 AM

Originally Posted by ECU-MAN

C = ALT C that goes to the ECU, You can probably leave it disconnected.

Ok, I'll give it a try....

**roy8532** · 26-03-2015 10:58 PM

C should be for control, which senses the loading on the alternator.

**39erman** · 29-03-2015 07:59 AM

Ok, went to the dyno with the "C" wire disconnected. Alternator o/put was at 16 volts, it ****ed in the battery in less than 5 mins!!!! Had to disconnect the the alternator completely to enable to tune it. So, the Haltech P1000 were using apparently can control the alternator, anyone have any ideas about this?

**39erman** · 04-04-2015 11:31 PM

Originally Posted by ECU-MAN

C = ALT C that goes to the ECU, You can probably leave it disconnected.

No way man. Sorry, but you HNFI about this.

**EGVTi** · 05-04-2015 01:52 AM

C is for the ELD (Electric Load Detector) and it goes to the underside of the fusebox in the engine bay.

**39erman** · 05-04-2015 07:30 AM

And where does it go if the is no ELD or ECU control?

**EGVTi** · 05-04-2015 02:30 PM

If there is no ELD plug then you just leave it and disable the ELD sensor in the ECU in the Misc page.

**39erman** · 05-04-2015 03:13 PM

Originally Posted by EGVTi

If there is no ELD plug then you just leave it and disable the ELD sensor in the ECU in the Misc page.

Which ECU is this? In the Haltech PS1000 there is no page that I can find. This is not the "plug n play" Pro series. We removed all the old wiring harness and installed our own new harness. Its a track car and therefore only requires the minium of wiring to make it operate.

But anyway, we fixed the problem easily enough.

**ECU-MAN** · 05-04-2015 07:12 PM

Originally Posted by 39erman

No way man. Sorry, but you HNFI about this.

And why would that be ?

**39erman** · 05-04-2015 07:55 PM

Originally Posted by ECU-MAN

And why would that be ?

By not connecting the ELD &/or ECU control terminal this allowed the regulator to run flat chat @ 18v just above idle. At least one of these two wires must be connected to control the regulator.

Unless of course, you do a simple internal mod to the alternator which I'll post up later once we get thru the current car prep and IPRA NSW next weekend.