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Group: Forum Members
Last Login: 5/19/2009 11:06:03 PM
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I need help with the basic wiring for a CJ7.
It is a beater jeep that I intend on just getting it running maybe do a few mods such as D44 from an old Scout and a spring over lift.
but since the jeep was not a "good idea" according to my wife, I have to spend very little noticable money on it until it is running.
Now for the problem, previous owner ripped out the wiring.....I want to have the least amount of wiring possible. i.e. not worried about lights, radio, etc. (it's going to be an off road 4x4 only).
I have a key switch with 4 contacts ST = starter, Bat = Battery, Acc = accessories, ig= ignition.
the module has 4 wires out, orange, blue black go to ditributor and the green to the neg side of coil. what connects to the + side of the coil? also the module has two wires going into it a red and white I don't know what needs to attach here??? Next the started selenoid has 4 positions labeled as S= ??, I= ??, post to battery and post to starter.
Altenator has one post that goes back to the fuse block ? and it splices to a clip that has two wires coming out of it and they go where?
I have the haynes manual.....I'm not an electrican just a country boy with a barn and a set of tools. Any help will be appreciated. I know the most simple would be to buy the Painless kit and be finished, but the wife says why throw money at a rust bucket that will never run. Help a fellow jeeper out.
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Post #589018
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Group: Forum Members
Last Login: 10/11/2007 1:00:26 AM
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Hey, I sympathize about the wife's complaining, I get all the time. Anyway, get yourself a Chilton's manual it has the wiring diagram for your jeep. Here is a stab at the wiring. The key switch first, terminal marked BAT is power from battery (need joice to run), terminal "st" goes to the starter solenoid (coil terminal, small terminal), accessories is just that (sound system lights), ignition I not sure. Your module wiring: Red wire is from ignition switch, this wire also goes to positive side of coil. That is from ignition switch to coil to module. My schematic shows a red/trace with an inline resistor between the coil and module. The white wire from the module goes to the starter solenoid. Again, my schematic shows white from module but terminates at the solenoid as lt blue. The starter solenoid posts: S is from ignition switch, I to ground or bat neg. Bat post is straight from battery, starter post goes straight to starter motor. The alternator, its post is wired to the solenoid terminal label "Bat" (yes the same). Basically the +term of the battery, and alternator joined at the solenoid. Yours may go to a fuse block. My 1980 jeep has a fuseble link instead of a fuse block. The starter draws current from the battery when cranking the engine. After the engine starts the alternator supplies current and charges the battery, that is why battery and alternator wires are connected at the same location. Therefore, one of the wires is for the battery and the second is for I believe a manifold heater (if used). That the best I can do for now. Maybe somone else can clearify or confirm some of this.
If I get a chance I will trace the wires tomorrow if you still need help.
Good Luck
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Post #589019
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Group: Forum Members
Last Login: 7/13/2010 1:16:59 AM
Posts: 4,470,
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hey, no problem...assuming factory ignition switch, AMC engine and motorcraft ignition box-- and NO wiring from the factory other than the wires hanging out of the motorcraft box... There are two really important resistance circuits involved.
What engine do you have?
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Post #589020
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Group: Forum Members
Last Login: 5/19/2009 11:06:03 PM
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Thanks for all suggestions. I'll post outcome after I try.
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Post #589021
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Group: Forum Members
Last Login: 2/18/2010 8:09:02 PM
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Don't hook the I terminal on the starter solenoid to ground,you will have a dead short when you engage the starter,the I terminal is to suply a full 12 volts to the ignition system,while cranking the engine.
1979 CJ-5
1986 CJ-7
1983 CJ-8 coming soon
1983 CJ-8 Sons
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Post #589022
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Group: Forum Members
Last Login: 5/19/2009 11:06:03 PM
Posts: 7,
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Tried all that was recommended and I fried a portable jump start box, I think I may have hooked up something wrong. Here is where I'm confused.....what hooks up to the + on the coil, where do the wires on the altenator go to, and what does the I on the starter selenoid go to? I did get the motor to turn over with the switch circuit. Is the chilton manual any easier to follow than the Haynes?
Thanks in andvance for any suggestions.
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Post #589023
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Group: Forum Members
Last Login: 2/18/2010 8:09:02 PM
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The + on the coil,splits off into two wires one goes to the red power feed to the ignition box,the other one goes to the I on the starter solenoid.On the alternator wires,the bolt terminal goes to the + side of the battery,as does the terminal furest away from the bolt terminal ,the other one is a resistor wire that goes to a hot wire when the key is in the on,and cranking position.
1979 CJ-5
1986 CJ-7
1983 CJ-8 coming soon
1983 CJ-8 Sons
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Post #589024
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Group: Forum Members
Last Login: 10/11/2007 1:00:26 AM
Posts: 79,
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I checked the solenoid "I" terminal with a meter, it doesn't go to ground. If you go to Autozone's web site you can look at the Chilton manual diagram. You can at least see if it's any better. However, it does not give terminal designators. And in this case shows the wrong color wire going to ground for the solenoid. I checked my jeep, several of the colors do not match up with the diagram, but that just could be my jeep. I bought it several years ago. (1980 cj7)
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Post #589025
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Group: Forum Members
Last Login: 10/11/2007 1:00:26 AM
Posts: 79,
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Tenn, Ted is correct. I found a wiring diagram with terminal designations in "The Jeep Bible". It clearly shows the correct wiring with terminal designations. Would send you a pic, but I don't have a scanner. You may want to pick this book up for future reference, it may be useful.
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Post #589026
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Group: Forum Members
Last Login: 7/13/2010 1:16:59 AM
Posts: 4,470,
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This is your basic ignition circuit for *every* gasoline rig built with 12v ignitions (post 6V) before HEI and computers.
Image Insert:
76.39 KB
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Post #589027
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