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Unread 02-09-2009, 05:42 PM   #1
jatepper
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DUI install with factory tach

Did a search and found some information about tracing the red wire from the ignition module to supply power to the DUI.

Can someone clarify this? I looked at the module and could not tell exactly which wire to splice in to. Will my factory tach still work?

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1985 Jeep CJ-7
Automatic-258 I6- Detroit lockers front/rear - Superior 1-piece axles, Ramsey Pro 9000 Winch, Quick Disconnects, 33 BFG AT's, 4.10 gears, Howell TBI, DUI HEI Ignition, Ground Pounder Rear Bumper / Tire Carrier Combo, Handen Fab integrated winch plate front bumper w/hoop, ORF weld-in front sport cage.

USMC 1999-2004 Semper Fi!

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Unread 02-09-2009, 06:02 PM   #2
BioTex
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Does this help?
tachometer_sketch.jpg  
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'85 CJ7, BDS 4" lift, 1" Body lift, 33x12.5, Shrockworks Sliders, 304 V8 with RV cam., T-176, D300, Dana 30, AMC 20.
1986 CJ10-A SD-33 Diesel/727/np208
1971 800B with 345/T-19
06' TJ Rubicon, 4" R.C. springs, BFG/AT 35s M.C. 6" fenders, rockers and surrounds, Currie front & rear adj. tracbars, tattons DC rear shaft, adj. upper - lower CA's. Bilstein 5100's
YJ Buggy Build Current project. Stroker/FI ?
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Unread 02-09-2009, 06:18 PM   #3
jatepper
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Well thats just the wiring diagram. Does the ignition coil postive terminal connect to power the DUI and the tach will still work? If so, I just remove from the bulkhead, splice, and have at it?

Thanks
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1985 Jeep CJ-7
Automatic-258 I6- Detroit lockers front/rear - Superior 1-piece axles, Ramsey Pro 9000 Winch, Quick Disconnects, 33 BFG AT's, 4.10 gears, Howell TBI, DUI HEI Ignition, Ground Pounder Rear Bumper / Tire Carrier Combo, Handen Fab integrated winch plate front bumper w/hoop, ORF weld-in front sport cage.

USMC 1999-2004 Semper Fi!

Hood Hi-Lift Jack Mounts for CJ/YJ/TJ/JK

Torchmate CNC Plasma Table Build / Projects

The Target Man, LLC - AR500 Shooting Targets
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Unread 02-09-2009, 07:08 PM   #4
jcal73
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Jatepper,

I used a relay switched from ignition power to power my DUI.

Here is a relay explanation that is from JEEPHAMMER it is his and can be a useful reference.



You would want to connect

battery to 30

Output to the DUI on 87

Ignition power on 85

Ground on 86.


Jeff
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Unread 02-09-2009, 07:11 PM   #5
jatepper
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Thanks, but I was wondering how to wire the thing up so my factory tach still works.
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1985 Jeep CJ-7
Automatic-258 I6- Detroit lockers front/rear - Superior 1-piece axles, Ramsey Pro 9000 Winch, Quick Disconnects, 33 BFG AT's, 4.10 gears, Howell TBI, DUI HEI Ignition, Ground Pounder Rear Bumper / Tire Carrier Combo, Handen Fab integrated winch plate front bumper w/hoop, ORF weld-in front sport cage.

USMC 1999-2004 Semper Fi!

Hood Hi-Lift Jack Mounts for CJ/YJ/TJ/JK

Torchmate CNC Plasma Table Build / Projects

The Target Man, LLC - AR500 Shooting Targets
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Unread 02-09-2009, 07:13 PM   #6
jcal73
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Sorry I stupid!

Jeff
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Unread 02-09-2009, 08:36 PM   #7
sweetguardian00
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the signal is different, the factory AMC tach didnt work on my HEI install (it actually bobbed to the radio, go figure!)
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Unread 02-09-2009, 08:41 PM   #8
BioTex
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I found this from one of JH posts, I knew I read this somewhere, since I purchased a factory tach, and was trying tofigure out how to wire it. I have all that info stored on a different computer, so no access to it right now.

If you have a FACTORY TACH, you will need to trace the module 'Red' power wire back in the harness where it hooks up to a 10 Ga. wire, and splice in there.

He wrote this in a thread discussing how to wire in a DUI. The red 10Ga. wire is BW in the picture
firewallplugdetails.jpg  
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'85 CJ7, BDS 4" lift, 1" Body lift, 33x12.5, Shrockworks Sliders, 304 V8 with RV cam., T-176, D300, Dana 30, AMC 20.
1986 CJ10-A SD-33 Diesel/727/np208
1971 800B with 345/T-19
06' TJ Rubicon, 4" R.C. springs, BFG/AT 35s M.C. 6" fenders, rockers and surrounds, Currie front & rear adj. tracbars, tattons DC rear shaft, adj. upper - lower CA's. Bilstein 5100's
YJ Buggy Build Current project. Stroker/FI ?
1990 MJ Comanche 4.0L AX15/np231
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Unread 02-09-2009, 08:47 PM   #9
jatepper
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Quote:
Originally Posted by BioTex View Post
I found this from one of JH posts, I knew I read this somewhere, since I purchased a factory tach, and was trying tofigure out how to wire it. I have all that info stored on a different computer, so no access to it right now.

If you have a FACTORY TACH, you will need to trace the module 'Red' power wire back in the harness where it hooks up to a 10 Ga. wire, and splice in there.

He wrote this in a thread discussing how to wire in a DUI. The red 10Ga. wire is BW in the picture

EXACTLY what I was looking for. So, the DUI will get its power directly from here, correct?? And, this is located on the engine comparment side of the firewall just under the brake booster, correct??
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1985 Jeep CJ-7
Automatic-258 I6- Detroit lockers front/rear - Superior 1-piece axles, Ramsey Pro 9000 Winch, Quick Disconnects, 33 BFG AT's, 4.10 gears, Howell TBI, DUI HEI Ignition, Ground Pounder Rear Bumper / Tire Carrier Combo, Handen Fab integrated winch plate front bumper w/hoop, ORF weld-in front sport cage.

USMC 1999-2004 Semper Fi!

Hood Hi-Lift Jack Mounts for CJ/YJ/TJ/JK

Torchmate CNC Plasma Table Build / Projects

The Target Man, LLC - AR500 Shooting Targets
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Unread 02-09-2009, 09:11 PM   #10
BioTex
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Yes, if you look inside the wire loom, you will see that wire BW is a 10 guage red. This is the wire I used to hook up my HEI.
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'85 CJ7, BDS 4" lift, 1" Body lift, 33x12.5, Shrockworks Sliders, 304 V8 with RV cam., T-176, D300, Dana 30, AMC 20.
1986 CJ10-A SD-33 Diesel/727/np208
1971 800B with 345/T-19
06' TJ Rubicon, 4" R.C. springs, BFG/AT 35s M.C. 6" fenders, rockers and surrounds, Currie front & rear adj. tracbars, tattons DC rear shaft, adj. upper - lower CA's. Bilstein 5100's
YJ Buggy Build Current project. Stroker/FI ?
1990 MJ Comanche 4.0L AX15/np231
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Unread 02-10-2009, 02:52 AM   #11
John Strenk
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This is the splice you are looking for:


Look for the big red wire going to the ignition module.
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Unread 02-10-2009, 06:48 AM   #12
wendell
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Some of the HEI distributers on ebay come with the tach adapter and some even come with the hook up for MSD 6 or the off/road box, it's just plug and play.
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Unread 02-10-2009, 07:19 AM   #13
John Strenk
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Make sure the Tach adapter works with sireis Tachs. Many just work with Aftermarket tachs. You can't miss hooking it up the way shown above.
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Unread 02-10-2009, 05:09 PM   #14
JeepHammer
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Quote:
Originally Posted by jatepper View Post
Did a search and found some information about tracing the red wire from the ignition module to supply power to the DUI.

Can someone clarify this? I looked at the module and could not tell exactly which wire to splice in to. Will my factory tach still work?
There is a power wire that comes from the ignition switch, through the bulk head fitting, and out to a number of things.
Usually, it feeds the Ignition module, Ignition coil through a resistor, and it 'Excites' the alternator so it starts charging.

If you take the two wire connector that plugs into your ignition module,
And use this gadget,
http://store.summitracing.com/partde...0&autoview=sku



You can plug your new HEI clone right into the part on the left with the Red & White wires.

This piece shown on the left plugs into the harness side of that module 2 wire connector, and will keep your factory 'Series' tach working just fine with the clone HEI's.

With this gadget, you simply unplug your module two wire connector,
Plug this thing into the harness side,
Then run a wire from the Crimp terminal at the top over to your HEI clone.
Use at least a 12 Ga. wire size, and you shouldn't have a problem with your factory Series type tach.

You will only use the part on the right, the 'SAE' plug and little connectors shouldn't be needed for your HEI clone.
--------------------------------------

John, notice that SUMMIT has a diode in their feed?
Remember the crap Dale gave me about having a diode in my 'Stealth HEI' set up?...
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Unread 02-10-2009, 07:14 PM   #15
John Strenk
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Quote:
Originally Posted by JeepHammer View Post

John, notice that SUMMIT has a diode in their feed?
Remember the crap Dale gave me about having a diode in my 'Stealth HEI' set up?...
Funny thing, I was tracing out a cheap DuraSpark module circuit board about 15 min ago and I said. "Well, they even have a diode on the board on that wire."

One of these days I'll have top draw up that circuit. I bet the OEM is way different than these cheap substitutes.

I'm going to add one onto my Stealth box also. Time I pulled out the new Digital scope out anyway.
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