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Unread 07-29-2014, 07:36 PM   #1
RM77CJ5
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Howell fuel injection...

Which wire to splice into for the ECM?
I can't find one that's hot in the "on" and "crank" position but off in the off position!!
Thanks. It's my last wire before I can fire her up!!

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Unread 07-29-2014, 08:19 PM   #2
Rebel442
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I ran mine straight off the Batt to a hidden switch. Ive heard that the computer really likes to see a good strong 12v, Plus the switch is an anti-theft.
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Unread 07-29-2014, 09:35 PM   #3
RM77CJ5
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Quote:
Originally Posted by Rebel442 View Post
I ran mine straight off the Batt to a hidden switch. Ive heard that the computer really likes to see a good strong 12v, Plus the switch is an anti-theft.
Understand the ECM likes the 12v. Any diagrams you can share?
What you're saying is, you ran a direct 12v from the battery to this switch, then flip it on to start and off when your done driving?
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Unread 07-29-2014, 10:44 PM   #4
Rebel442
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Yup, just a wire a fuse and a switch. I was excited to get it running and this was an easy way
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Unread 07-29-2014, 10:49 PM   #5
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I dunno, that sounds pretty hack IMO.


I don't have the desire to look up a wiring harness for a '77 at the moment, but it isn't that hard to find a wire that's hot in run and start and off in off. Pretty sure that there's a blank terminal in the fuse box that fits the bill. There has been one in every TBI install I've done.
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Unread 07-30-2014, 01:57 AM   #6
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perhaps this diagram will help. It is a 1984 but the basics of the wiring in the switch are similair to the 1977.

On the left hand of the switch diagram is a red with tracer wire for the Ignition. This is live in Run and Start because it powers numerous items needed for the engine to run.
84-86fuseboxsch.jpg

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Unread 07-30-2014, 05:53 AM   #7
RM77CJ5
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Quote:
Originally Posted by CSP View Post
I dunno, that sounds pretty hack IMO.


I don't have the desire to look up a wiring harness for a '77 at the moment, but it isn't that hard to find a wire that's hot in run and start and off in off. Pretty sure that there's a blank terminal in the fuse box that fits the bill. There has been one in every TBI install I've done.
I thought there would be one too in the fuse block. No such luck!

Quote:
Originally Posted by BagusJeep View Post
perhaps this diagram will help. It is a 1984 but the basics of the wiring in the switch are similair to the 1977.

On the left hand of the switch diagram is a red with tracer wire for the Ignition. This is live in Run and Start because it powers numerous items needed for the engine to run.
Thanks for the diagram. I'll get out there and look a lil' harder. Maybe this will motivate me more to put the Painless harness in. Start from scratch!
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Unread 07-30-2014, 08:06 AM   #8
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Yes, there is a wire in the fuse block that's hot in run and start. The CJ wouldn't run if there wasn't at least one.

Section 22 in this link is the wiring diagram for a '76, which will be the same as your '77.

http://oljeep.com/edge_76_tsm.html
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Unread 07-30-2014, 08:13 AM   #9
Rebel442
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Quote:
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I dunno, that sounds pretty hack IMO.
It may be, but id bet its not the most hack thing that someones ever done to a Jeep, plus I never run doors or a top in the summer and a hidden kill switch is a least a little peace of mind.
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Unread 07-30-2014, 01:05 PM   #10
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I'll look again. Maybe I had a bad ground on the test light? I tested everyone with the light and sure enough each one that was hot went dark in the crank position!
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Unread 07-30-2014, 01:15 PM   #11
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I'll look tonight on mine to see where it is. My '75 has the same fuseblock.
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Unread 07-30-2014, 06:42 PM   #12
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Quote:
Originally Posted by CSP View Post
I'll look tonight on mine to see where it is. My '75 has the same fuseblock.
Thank you.

On side note, how about those Broncos? Thinking of heading over for a game this year!!
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Unread 07-30-2014, 10:30 PM   #13
RM77CJ5
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After punching through my 3rd red wire with tracer, I found the ignition wire. Still no go. Cracked the pressure line to the TBI for the airlock thing and I have no fuel!! Pump is working and I can hear the air coming out of the line. I have the correct line, checked and triple checked. Still no fuel. Thus my issue.
I did put fuel in the tank if anyone was going to ask.
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Unread 07-31-2014, 03:51 AM   #14
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Quote:
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Pretty sure that there's a blank terminal in the fuse box that fits the bill.
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Unread 07-31-2014, 07:41 AM   #15
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Go to that link for the wiring diagrams and on the one with the fuse panel, the terminal labeled 12F is hot in run and start. I checked my '75 as well as a friends '78 that I put a DIY EFI system in and that terminal was used on both for power to the ECM.
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