DUI distributor power source

Modified FSJ Tech Area
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Topic author
Horsman
Posts: 70
Joined: Thu Nov 25, 2021 7:36 pm
Location: North Texas

DUI distributor power source

Post by Horsman »

Was wondering what the best place is to pick up 12 volts for my new DUI distributor. Working on a 79 Wagoneer with a 360 engine. The attached pic shown has the fuse box at the firewall and the connectors at the ignition box. I figured one of those wires would be good. Also does everyone recommend removing all the old wiring from the engine harness or cutting off the connectors and sealing up the ends with heat shrink? Any advise is appreciated.
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Jeff Horsman
1979 Jeep Wagoneer
1971 Cutlass SX455

will e
Posts: 5096
Joined: Sat Aug 18, 2012 8:21 am

Re: DUI distributor power source

Post by will e »

The big fat red wire should provide the requirements. Confirm it is hot when the ignition is on. Another option is to add a relay that uses a source from the battery and a trigger from an 'ignition on' source.
81 Waggy 'WILL E' Retired
82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau XRS Baja & 5 point retractable harness/Hella Aux lights/tuffy console/killer32 sliders/Evil Twin bumpers, rack and roll cage/WARN 8000/TT Fabworks steering brace/dual batts/custom TC skid plate/ARB fridge

OldFarmTruck22
Posts: 244
Joined: Sat Mar 05, 2022 4:35 pm

Re: DUI distributor power source

Post by OldFarmTruck22 »

Like will e says, that big Red wire that went to the old ignition module will power your HEI just fine.
78 FSJ AMC 360 Quadratrac

Topic author
Horsman
Posts: 70
Joined: Thu Nov 25, 2021 7:36 pm
Location: North Texas

Re: DUI distributor power source

Post by Horsman »

Thanks guys. Any opinions on removing the old wiring to clean up the harness. Those barrel connectors at the ignition box, distributor are hideous.
Jeff Horsman
1979 Jeep Wagoneer
1971 Cutlass SX455

sierrablue
Posts: 1208
Joined: Wed Nov 30, 2022 8:02 pm
Location: MN/CO

Re: DUI distributor power source

Post by sierrablue »

If you're eliminating the Duraspark system, and you're not going to use it again, I'd say pull it out. Can't cause you headaches later, unless for some reason you decided to put the Duraspark back in, in which case it'd be a massive headache. If you're confident that you're eliminating it, get rid of the harness.

Otherwise you end up with this whole string of plugs, and it looks bad, and if you ever run into electrical issues, you have an even harder/more frustrating time finding it.
'71 Wagoneer (DD)
-B350 (HEI, iron 4-barrel, Edelbrock 1406), TH400, D20
-'74 D44 front (nonpower discs)
-custom headliner
-Front shoulder belts (rears eventually)

viewtopic.php?t=23070

There are 2 major differences between new Wranglers and FSJs. FSJs are meant to be both utilitarian and capable, not just capable. FSJs are also rarely initially recognized as Jeeps by the average American.
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