[Gmecm] Big cap HEI on 7747

[Mark Romans]

Hi Andrew:   On this application (747) there are 4 wires that go between the 
ecm and the distributor.

Circuit Number    Color           ECM Pin     Dist Pin Small Cap       Big 
Cap
423                     WHT               D4               D 
A
430                     PPL/WHT        B5              C 
B
424                    TAN/BLK         D5              B 
C  (EST BY-PASS SET TIMING)
453                    BLK/RED          B3             A 
D

The stock application uses the small cam dist, this car is fitted with a 
large cap hei that is wired like the shop manual says as noted above.

HELP!!!

Thanks

Mark


----- Original Message ----- 
From: "Andrew Gibson" <andrewsharyn at yahoo.com>
To: <gmecm at diy-efi.org>
Sent: Friday, June 02, 2006 11:42 AM
Subject: [Gmecm] Big cap HEI on 7747


> It sounds like you have hooked up the pickup wires backwards. Been there 
> done that on a Chev 250 6cyl 7748. Runs like garbage when backwards. Runs 
> great with ecm doing fuel only or with the est unhooked. Just swap the 
> green and white wires and see what happens.
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