Wiring issues
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Wiring issues
Hi everyone. I'm new to the forum but have a question that hopefully someone can give me an answer. I have a 1974 Dodge Challenger that has a 1970 383 engine in it. The engine was installed before I purchased the car 10 years ago and I did not do the install. Although I have had no problems I want to install a new engine wiring harness as many of the wires are starting to crack. My question is as the 383 was not an option in 1974, will there be issues in just buying a engine wiring harness from Painless or Yearone for the 1974 Challenger? Will everything just plug in, (i.e. firewall connector, etc.)? I note that there were two options for the the 1974 model year, (pre-October 1973 and post-October 1973). Or, can I just purchase a engine wiring harness for the 1970 or 1971 model year with a 383 and everything is plug and play for the 1974 model year? I am experienced with wiring but don't want to re-invent the wheel here. I am sure which ever one I purchase they won't take back once I have actually tried to install. Thanks in advance!
Mopar Lover
Joined: Mar 2009
Posts: 837
Likes: 2
From: Springfield NE
I cant remember for sure but didn't 74 challenger's have an option for a big block? [maybe a 400].
If worse comes to worse you could always order the wiring for a 74 charger with a 400 big block. I believe the engine compartments were very similar. [as the "E" bodies were actually based off of the "B" bodies]
Probably a 71 challenger with a 383 would be another option. I cant think of too many things that were added to the harness [from 71 to 74]except for maybe some things to do with emissions. The firewall harness plug was the same.
If worse comes to worse you could always order the wiring for a 74 charger with a 400 big block. I believe the engine compartments were very similar. [as the "E" bodies were actually based off of the "B" bodies]
Probably a 71 challenger with a 383 would be another option. I cant think of too many things that were added to the harness [from 71 to 74]except for maybe some things to do with emissions. The firewall harness plug was the same.
Mopar Lover
Joined: Apr 2009
Posts: 1,892
Likes: 4
From: Michigan: The First Line of Defense From The Canadians!
X2, any harness for a 74 E body big block should work. But the wiring guys will tell you for sure. If you have a/c let them know. I think there is an extra wire that fires a dashpot to raise the idle when the a/c is engaged.
Mopar Lover
Joined: Apr 2009
Posts: 1,892
Likes: 4
From: Michigan: The First Line of Defense From The Canadians!
http://www.mymopar.com/downloads/1974/74ChallengerA.JPG http://www.mymopar.com/downloads/1974/74ChallengerB.JPG Hope these factory diagrams help you. good to have around. Welcome.
Mopar Fanatic
Joined: Sep 2012
Posts: 369
Likes: 43
I believe Year one has optional wiring harnesses available , so you can geta harness for a 70 with electronic ign or you can get a harness for a 73 with a Big block as this is a common swap . the difference yaer to year is the wire positions change as option changed so if you order a 70 Big block harness some of the wires will be in the wrong location in the plug , it is easy to move them . or the other way is to simply extend the wires to the coil , dist & water temp on a small block harness
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