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Idiots Guide to Ignition Wiring?


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#1 *727Capt *

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  06 December 2005 - 12:16 PM

Hi all,
I am new to this place. I have a 1996 Jeep Cherokee Sport. It is 4WD, Auto Trans, 4DR, Rolldown windows and lock-yourself doors (if this helps). My ignition swith has gone to the crapper. It will not keep the car's power on after I switch it to start. I have to force the key manually into the on position to run. I would like to resolve this problem by installing a $5.00 push starter I bought. Before I go and tear the thing apart I would like to know what I'm getting into. Any info on this would be greatly aprieciated. Thanks.
727Capt
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#2 Exact-Oh

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  06 December 2005 - 03:05 PM

This is not a difficult install. I would suggest just replacing your ignition tumbler instead though.

You must first ensure that your push button is cabable of taking at least 30 amps first. This is very important, and normally finding a momentary push button that can handle 30A is not easy. If you don't have a button that can handle 30A, you must install a relay.

All the wire colors that I refer to here are running down your steering column from the ignition switch.

You will only be interested in one of the large Red wires (there are two), it doesn't matter which one, and the large yellow wire. Refer to these pictures for wiring diagrams. All of the wires in the diagrams must be added to the Jeep, except for the ones that I have marked Red and Yellow.

Scenario 1: Push button switch can handle 30A (probably not)
Scenario 2: Use relay, energized from push-button switch.

And, you must use all 12 gage wires, except those on either side of the push-button switch in Scenario 2.

Attached Images

  • Scenario2.JPG
  • Scenario1.JPG

Edited by Exact-Oh, 06 December 2005 - 03:08 PM.

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#3 zolar

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  06 December 2005 - 05:23 PM

well said Exact-Oh :welcome

a new tumbler would be muckh easier IMHO

you would still need the key to turn on the acc and ign circuits
if you use a push button start switch,

or use seperate high-current switches or relays,
for the acc, and ign circuits

.....there are several circuits the cylinder turns on at once


12volts red + ignition harness

Starter yellow + ignition harness

Ignition blue + ignition harness

Accessory purple + ignition harness



to get to these wires, you are in the same area as installing a new cylinder

if you choose to wire a switch, be very carefull with theshigh-current wires,
they can cause a major fire

:lol2
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#4 *727Capt *

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  07 December 2005 - 12:01 PM

Hey thanks Exact-oh and zolar. I realy appriciate the help.
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#5 Exact-Oh

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  07 December 2005 - 04:35 PM

well said Exact-Oh  :DD

a new tumbler would be muckh easier IMHO

you would still need the key to turn on the acc and ign circuits
if you use a push button start switch,

or use seperate high-current switches or relays,
for the acc, and ign circuits

.....there are several circuits the cylinder turns on at once


12volts  red  +  ignition harness
 
Starter  yellow +  ignition harness   
       
Ignition blue    +  ignition harness   
               
Accessory purple  +  ignition harness   


     
to get to these wires, you are in the same area as installing a new cylinder

if you choose to wire a switch, be very carefull with theshigh-current wires,
they can cause a major fire

:inot

[*]346669[/*]

Thanks Z!

After reading your reply, I guess I really didn't consider if the any of the accesory wires went off during start. If they do, I guess there won't be a major issue, as long as the current draw isn't too much for the constant 12V wires running to the switch.

But again, an ignition switch is usually not an expensive part, and labor is not as involved as adding this switch.
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#6 Shady Sherlock

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  07 December 2005 - 05:05 PM

Have you tried a new key, :inot , if your using an old POS worn out key, it won't move the tumblers to the proper place and could cause the ign. switch to bind.

Edited by tint_detective, 07 December 2005 - 05:06 PM.

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#7 Mr paladin

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  07 December 2005 - 05:13 PM

This is not a difficult install.  I would suggest just replacing your ignition tumbler instead though.

[*]346606[/*]

:inot
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#8 zolar

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  07 December 2005 - 05:48 PM

there you are Captian

3 votes for a new tumbler

:) :DD :inot
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#9 Meff

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  07 December 2005 - 08:49 PM

Now 4 votes to replace the tumbler.
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#10 Exact-Oh

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  08 December 2005 - 10:32 AM

I suppose though, that vehicle uses one key for the doors and ignition, and replacing the tumbler would mean either replacing all the lock tumblers or carrying two keys.

I would probably opt to just carry two keys, being that the vehicle is ten years old.
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#11 *capple *

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  11 December 2005 - 04:40 PM

My 95 jeep did the same thing last month. My contacts melted. I bought a $20 switch. installed my cylinder into it. Replace the fan motor that smoked the switch. went through 3 junk jeeps to find one fan control switch that was not melted too. and now all is well. I'm sure for a small fee a lock smith would repair the tumblers so you can have the same keys for the door and Ignition
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#12 reagd

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  24 August 2009 - 04:51 PM

Hi all,
I am new to this place. I have a 1996 Jeep Cherokee Sport. It is 4WD, Auto Trans, 4DR, Rolldown windows and lock-yourself doors (if this helps). My ignition swith has gone to the crapper. It will not keep the car's power on after I switch it to start. I have to force the key manually into the on position to run. I would like to resolve this problem by installing a $5.00 push starter I bought. Before I go and tear the thing apart I would like to know what I'm getting into. Any info on this would be greatly aprieciated. Thanks.
727Capt


I want the diagram presented earlier. I am bit confused with some issue bout ign circuits lately. This link might help you too.
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