Diacom cable for GM

[Terryk]

No, it does not work that way. The RED lead goes through a resistor to the
CE lamp.

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> From: John Hess <JohnH at ixc-comm.net>
> To: 'diy_efi at coulomb.eng.ohio-state.edu'
> Subject: RE: Diacom cable for GM
> Date: Monday, October 13, 1997 7:36 PM
> 
> Actually, the 12 volts (per the documentation) is only necessary if the
> unit does not power itself properly off the Parallel (Not RS-232) port.
> I think I have the schematic of the interface;  but, haven't had the
> time to breadboard it, yet!
> 
> 
> > ----------
> > From: 	sfg[SMTP:sfgent at ac.net]
> > Sent: 	Monday, October 13, 1997 9:02 AM
> > To: 	diy_efi at coulomb.eng.ohio-state.edu
> > Subject: 	Diacom cable for GM
> > 
> > I purchased the Diacom diagnostic interface (GM) kit back in '92. It
> > runs under DOS and has been worth the $200 or so I spent on it.
> > The supplied cable, which connects your RS232 to the ECU (ALDL) has a
> > red wire for 12VDC input. Recently I discovered the system works with,
> > or without the 12VDC connected. I had always assumed there were active
> > components molded into one of the connectors; now I am wondering if
> > its
> > really just a hunk of wire, with connectors on each end. Anyone know?
> > Steve
> >