GM-HEI Modules

[Sandy]

Thanks Bob, the stuff that I have seen on the ECS HEI modules is out of the
Chilton's (Chitlins) book on GM Engine Electronics, seems to be pretty good
at describing the pins, functions, and testing the modules. I always liked
the HEI's, simple and usually pretty rugged. I'll be down at the autoparts
store this week and pick up a module and try it with a 'Dummy' load and see
what it looks like.

Sandy

At 01:01 PM 2/17/98 +0000, you wrote:
>Sandy
>
>I have adapted HEI to VW.  The small pins(2) get the AC voltage from 
>the reluctor (maybe around 5v).  Check it with a scope as it is not a 
>sine wave.  My understanding is that it has to go negative to turn 
>off, so it may have an SCR(silicon controlled rectifier).  I don't 
>think you have to worry about the coil drawing too much current.
>The old HEI transformer(coil) put out one of the hotest sparks going.
>Their problem is that if there is no load on them(spark plug), the 
>voltage goes so hi that it arcs internally and ruins the coil.
>
>Bob McKnight
>Phx AZ
>
>PS If you have any details on the later modules, please share it.
>PPS To the best of my knowledge, they are just a switch.
>
>