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Guest 727Capt

Idiots Guide to Ignition Wiring?

15 posts in this topic

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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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.

post-380-1133910327.jpg

post-380-1133910341.jpg

Edited by Exact-Oh

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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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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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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

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

[*]346606

:inot

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there you are Captian

3 votes for a new tumbler

:):DD :inot

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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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