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  #1  
Old 08-31-2016, 08:38 PM
FDSJr FDSJr is offline
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Question Final electrical connections on Howell TBI install

I am coming down the home stretch on the installation of a Howell TBI on my 1991 GW. Can anyone give me a good hint on where to connect the lead that is labelled as "Switched 12 V Ignition Power". The lead is located inside the passenger compartment along with the fuse block, diagnostic connector, and ECM connectors. According to Howell it needs to connect to a 12 V source that is hot during BOTH crank (start) and run. According to the 91 GW wiring diagram there should be a green wire coming from the ignition switch that would a good spot to connect it, but I sure can't find that green wire or any other wires that originate in the ignition switch!!! Maybe there is a better, easier to find, location for the connection.
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  #2  
Old 08-31-2016, 09:17 PM
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I've always used the yellow wire of 2-wire duraspark ignition module plug.
Under hood driver's side close to firewall.

Ignition switch wires are on top of steering column.
You will need to drop column or remove instrument cluster to get good connection to any wire there.

TBI needs good power & especially ground.
Run a dedicated ground to engine block.
A poor ground will cause problems. Don't use a body ground.
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'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
1994 Caprice wagon
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  #3  
Old 09-01-2016, 08:22 AM
FDSJr FDSJr is offline
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Thanks for the info. Dropping the steering column or removing the instrument panel is NOT going to happen!!

When I couldn't find an appropriate connection inside the passenger compartment, I had considered the yellow wire feeding the ignition module. Based on your comments, it sounds like that might be the best way to go.
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Old 09-01-2016, 08:46 AM
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Easy to tap into, I don't run the duraspark module anymore, but it would still be easy to tap in there.

Mine is used to trigger a relay mounted over on passenger side fender well.

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'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
1994 Caprice wagon

Last edited by babywag : 09-03-2016 at 11:09 AM.
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  #5  
Old 09-01-2016, 06:31 PM
FDSJr FDSJr is offline
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I checked continuity between the battery positive terminal and the yellow wire to the module. There is continuity during both crank and run and no continuity when the key is off. That seems to be a perfect spot for the connection. I hope to have everything connected and ready to fire it up by Saturday.
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  #6  
Old 09-02-2016, 10:40 AM
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TexasJ10 TexasJ10 is offline
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Quote:
Originally Posted by babywag
Easy to tap into, I don't run the duraspark module anymore, but it would still be easy to tap in there.

Mine is used to trigger a relay mounted over on passenger side fender well.


I wonder what's been up lately that I haven't been able to view your picture posts lately. I just get a negative sign in a circle.
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Old 09-03-2016, 11:04 AM
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Quote:
Originally Posted by TexasJ10
I wonder what's been up lately that I haven't been able to view your picture posts lately. I just get a negative sign in a circle.

Google discontinued picasaweb, and now photos seems problematic to host pics on this site.

No issues on other forums, but the version of vBulletin here seems picky.

Does is show for you now?
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'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
1994 Caprice wagon
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Old 11-01-2016, 08:21 PM
titanjeep titanjeep is offline
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Quote:
Originally Posted by babywag
Google discontinued picasaweb, and now photos seems problematic to host pics on this site.

No issues on other forums, but the version of vBulletin here seems picky.

Does is show for you now?

I am working the same installation and I would love to see a picture or diagram of your setup, but I am having the same issue with your pictures as some of the other members. Would you be willing to PM a picture/diagram?
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Old 11-02-2016, 07:42 AM
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Quote:
Originally Posted by titanjeep
I am working the same installation and I would love to see a picture or diagram of your setup, but I am having the same issue with your pictures as some of the other members. Would you be willing to PM a picture/diagram?

What do you need a pic(s) of?
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'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
1994 Caprice wagon
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  #10  
Old 11-02-2016, 05:44 PM
titanjeep titanjeep is offline
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Quote:
Originally Posted by babywag
What do you need a pic(s) of?
I would love to see pictures of where you tapped into the crank signal and how you wired it into your relay and attached it to the Howell harness if you have them.
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  #11  
Old 11-03-2016, 08:54 AM
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Quote:
Originally Posted by titanjeep
I would love to see pictures of where you tapped into the crank signal and how you wired it into your relay and attached it to the Howell harness if you have them.

Crank wire goes to either starter relay terminal, or easier IMHO the starter solenoid.



Power for ignition crank/run comes from old existing duraspark wiring connector. It simply runs to a relay so system gets full battery voltage.
If still running the DS module you can still tap into this wire easily enough.
I don't have a picture of the relays handy, but can take one later and post.



If needed I also created a easier to read TBI wiring diagram.
https://drive.google.com/file/d/0B7y...ew?usp=sharing

My system isn't really a Howell system, but is set up almost identical to it for CA smog purposes.
I added timing control, the Howell 50-state legal system doesn't utilize timing control.
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'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
1994 Caprice wagon
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  #12  
Old 11-04-2016, 09:06 PM
titanjeep titanjeep is offline
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Quote:
Originally Posted by babywag
Crank wire goes to either starter relay terminal, or easier IMHO the starter solenoid.



Power for ignition crank/run comes from old existing duraspark wiring connector. It simply runs to a relay so system gets full battery voltage.
If still running the DS module you can still tap into this wire easily enough.
I don't have a picture of the relays handy, but can take one later and post.



If needed I also created a easier to read TBI wiring diagram.
https://drive.google.com/file/d/0B7y...ew?usp=sharing

My system isn't really a Howell system, but is set up almost identical to it for CA smog purposes.
I added timing control, the Howell 50-state legal system doesn't utilize timing control.

Thanks for the information. I still can't get the pictures to come up, but the diagram is awesome and I have been studying it.

What system are you running? I never found a CARB compliant system that also controls spark.
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  #13  
Old 11-06-2016, 09:12 AM
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babywag babywag is offline
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It's just a standard 1227747 system with timing control.
The GM ignition module is hidden inside a factory Duraspark box.

Far as the pictures, if I view this site on my iPhone pics do NOT show.
If I view from my android phone, or my laptop they show.
Not really sure why, but might be your issue?
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'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
1994 Caprice wagon
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  #14  
Old 05-29-2017, 01:41 PM
titanjeep titanjeep is offline
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It took forever, but the Howell system is finally installed and running well. Thanks again for the information, I ended up using the yellow wire you identified.
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  #15  
Old 05-29-2017, 02:35 PM
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Quote:
Originally Posted by titanjeep
It took forever, but the Howell system is finally installed and running well. Thanks again for the information, I ended up using the yellow wire you identified.


It'll run even better if you tune it. Costs a little, but worth it IMHO.
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'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
1994 Caprice wagon
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  #16  
Old 06-18-2017, 07:25 PM
titanjeep titanjeep is offline
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Quote:
Originally Posted by babywag

It'll run even better if you tune it. Costs a little, but worth it IMHO.

You mean update the proms on the chip?
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  #17  
Old 06-18-2017, 07:58 PM
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Quote:
Originally Posted by titanjeep
You mean update the proms on the chip?

yes
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'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
1994 Caprice wagon
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