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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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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.Tony
88 GW, 67 J3000, 07 Magnum SRT8 -
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.Comment
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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.
Last edited by babywag; 09-03-2016, 10:09 AM.Tony
88 GW, 67 J3000, 07 Magnum SRT8Comment
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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.Comment
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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.Originally posted by babywagEasy 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.
* 1981 stepside, 360, 727, 208, almost stock daily driver.
* 1982 Laredo j-10, 360, 727, in rough shape and in the process of being rebuilt with 401, NV4500, Klune,
. NP205,d60 front, d70 rear, fender work and minimal lift. It will probably take 10 years
* 1973 jcab mounted on 1983 j20 frame. 360/t18/208 d44/d60. Almost completedComment
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Google discontinued picasaweb, and now photos seems problematic to host pics on this site.Originally posted by TexasJ10
No issues on other forums, but the version of vBulletin here seems picky.
Does is show for you now?Tony
88 GW, 67 J3000, 07 Magnum SRT8Comment
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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?Originally posted by babywagComment
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What do you need a pic(s) of?Originally posted by titanjeepTony
88 GW, 67 J3000, 07 Magnum SRT8Comment
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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.Originally posted by babywagComment
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Crank wire goes to either starter relay terminal, or easier IMHO the starter solenoid.Originally posted by titanjeep
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.
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.Tony
88 GW, 67 J3000, 07 Magnum SRT8Comment
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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.Originally posted by babywagCrank 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.
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.
What system are you running? I never found a CARB compliant system that also controls spark.Comment
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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?Tony
88 GW, 67 J3000, 07 Magnum SRT8Comment
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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.Comment
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Originally posted by titanjeep
It'll run even better if you tune it. Costs a little, but worth it IMHO.Tony
88 GW, 67 J3000, 07 Magnum SRT8Comment
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