Pin questions for '7747 prior to installation

[srgould41]

Forgive me for forgetting my notes and posting based on memory. I am in the process of cleaning up my harness and want to figure out a couple of things. It's going in a 4x4 crawler.

First, pin B8 for the AC signal. What does this do exactly and does it expect 12v or ground? I assume it raises RPM which I could use for winching. It would be worth adding a switch in my dash if it does raise the RPM. Would the switch supply ground or 12v?

Second, the ALDL wires. The pinout of the ALDL doesn't match anything I have found. The positions are all wrong. I assume I can swap pin positions (haven't tried). What bothers me is that A5 for the SES light terminates in the ALDL connector. Surely this isn't correct or did the early computers do this?

Thanks,

Steve

[mmigacz]

Second, the ALDL wires. The pinout of the ALDL doesn't match anything I have found. The positions are all wrong. I assume I can swap pin positions (haven't tried). What bothers me is that A5 for the SES light terminates in the ALDL connector. Surely this isn't correct or did the early computers do this?

Thanks,



Below should help with wiring the ALDL

7088

[srgould41]

I will have to verify tonight, but this image does show the SES wire going to the ALDL port. Can I just run a wire from that pin to a dash light (12v at the light and the SES pin being the ground)?


Second, the ALDL wires. The pinout of the ALDL doesn't match anything I have found. The positions are all wrong. I assume I can swap pin positions (haven't tried). What bothers me is that A5 for the SES light terminates in the ALDL connector. Surely this isn't correct or did the early computers do this?

Thanks,



Below should help with wiring the ALDL

7088

[EagleMark]

You only need three wires to ALDL port as shown in this diagram.
http://www.gearhead-efi.com/Fuel-Injection/attachment.php?attachmentid=1935&d=1331599707

For the SES/CEL you need 12 volt to light and the other to A5 at ECM is the ground
http://www.gearhead-efi.com/Fuel-Injection/attachment.php?attachmentid=1937&d=1331599707

[mmigacz]

Whoops, I had an error.

7089

[srgould41]

I reviewed my ALDL and the pin positions do not match either drawing. I'll have to resolve that. Thanks.