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Gm 5 Pin Hei Module Wiring. This will be covering the 4-pin HEI module. Starting in 1981 ignitions with complete computer control of spark timing use a seven terminal mod- ule.

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If not the arrangement will not function as it ought to be. Starting in 1981 ignitions with complete computer control of spark timing use a seven terminal mod- ule. A wire can be run from the 5 Vref for the TPS Pin 26 on the DB37 to the HEI pin B through a relay that is switch from a source that is hot in RUN but not CRANK see the diagram below.

You could also use a distributor with a 5-pin module and replace the module with a 4-pin one.

You could also use a distributor with a 5-pin module and replace the module with a 4-pin one. Alternatively you can use the spare port settings to send a 5 Volt signal. GM HEI 5 pin spark retard. Gm Hei Module Wiring Diagram Free Picture Slim Leadership Fiocouture It.