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ignition questions
https://slantsix.org/forum/viewtopic.php?t=16597		 Page 2 of 2
Author:  70valiant [ Mon Mar 20, 2006 4:05 pm ]
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If you hold the GM ECU so it looks like a "C" the top two pins go to the coil and the bottom two go to the distributer. I dont remember the exact configuration but it is a very simple upgrade. I'm sure SlantSixDan knows exactly how it goes I am under the impression he has done quite a few. I did this swap around 3 years ago.
Author:  Super6 [ Mon Mar 20, 2006 4:37 pm ]
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Super 6, I have a 79 distributor w/vac advance and a GM HEI 4 pin module. Is there anywhere with wiring instruction or diagrams to do away with the SCC? which wires from the 10 pin connector will be used for the HEI module? Thanks in advance.
HERE are the diagrams showing how to identify the terminals on the HEI module, and where to wire them (beware the popups!).

The parts of that diagram referring to 'ballast resistor diagrams' will not apply to your truck. Instead, locate the dark blue wire from the 10-pin connector leading to the SCC. This is your only ignition switched power wire. You can also find this wire by tracing it back from the voltage regulator.

The best place to tap into power from this wire is in the vicinity of the brake booster (above it, where the harness begins to lead over to the passenger side of the engine bay). There is a factory multiple splice/junction located there, where the one wire from the ignition switch splits into several wires to power the SCC, voltage regulator, any present carburetor solniods, etc.

If you just tap into power from the ignition wire for the HEI ignition, and leave the SCC connected and powered, you will not lose the lockup function on your transmission. ;)

-S/6
Author:  SlantSixDan [ Mon Mar 20, 2006 4:38 pm ]
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Article on HEI is Here
Author:  Super6 [ Mon Mar 20, 2006 4:44 pm ]
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I just realized you have a 4-speed. Nevermind what I said about keeping the lockup function, as it applies to automatic transmissions only. :oops:
Author:  Super6 [ Fri May 26, 2006 11:56 am ]
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Sorry, Super6. The engine computers on Chrysler Corp vehicles, with carbs, are 1st generation "dumb" computers. Thay do not have the ability to "talk" to "code readers", scan tools, or flash check engine lites. It wasn't untill fuel injection, that the computers could talk back.
Reviving an old post as I finally obtained some information on the matter.

Below is quoted from page 25-31 of a 1986 Factory Service Manual for RWD Dodge Trucks and Ramchargers:
Quote:
The ESA/EFC (Electronic Spark Control/Electronic Fuel Control) computer has been programmed to monitor several different component systems. This monitoring is called On-Board Diagnostics. If a problem is detected with a monitored circuit often enough to indicate an actual problem, its Fault Code is stored in the computer for eventual display on the Diagnostic Readout Tool C-4805. If the problem is repaired or ceases to exist, the computer cancels the Fault Code after 20-40 ignition key on/off cycles. The memory can also be cleared by disconnecting the computer 14-way connector for one minute and then reconnecting it.
Page 25-32 of the same manual goes on to list Fault Codes 00, 11 through 18, 21 through 33, 55, and 88.

The manual makes no reference to being able to retrieve the codes through the ignition key on-off procedure, but I am still quite certain it worked on my '87 D150.

I gained posession of the '86 FSM because I remember a former/no longer active member (Craig) stating he had looked at both an '86 and '87 FSM side by side, and said they were identical. So I finally have complete information for my truck. :D

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Must've been an interesting nonstandard computer unit, then, because flash codes did not officially arrive until EFI. You didn't discard a rare, one-of-none, super-double-intergalactic-secret factory prototype, did you? :lol:
THIS PICTURE is of the ESA/SCC computer and wiring ends from my truck. If you look closely at the connector furthest right, it has seven visible pins. It is double layered, and I assume is the 14-pin connector reffered to in the FSM. The computer also had a second connector, with I believe 10 pins.

I hope that sheds a little light on the subject. :?

-S/6
Author:  SlantSixDan [ Fri May 26, 2006 12:22 pm ]
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Well, then I stand (sit) corrected!
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