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Username Post: Ignition/crank power on/off switch        (Topic#357609)
gchemist 
Senior Chevytalk Moderator
Posts: 24852
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
08-11-19 12:50 PM - Post#2772968    

A '95 GMC Jimmy has a short in the key switch wiring. The key cylinder has been replaced. With a slight movement, key out, it will crank until the battery is dead. It won't start because fuel and ignition are off (or at least one of them). I suggested installing a push button to cut crank power. However, I'm not sure which power to cut out and switch activate. The steering column must have power on all the time if key is removed and it will crank on it's own. I have a set of '96 factory manuals. Wiring should be the same for a '95. At least close enough since it was a transition year to MPFI in '96.

Does anyone have a suggestion? A color power on/off switch is on order. After turning off, switch will be turned off to cut power. The switch will be lighted with power on. In the run position, the starter has not engaged. It only engages in off and key out/in position.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 




acardon 
Ultra Senior Member
Posts: 11265
acardon
Loc: DFW TEXAS
Reg: 03-25-05
08-11-19 01:32 PM - Post#2772969    
    In response to gchemist

Purple wire powers the starter solenoid. The key has a double D connection to the switch, it could be 180 degrees out of phase.


Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
gchemist 
Senior Chevytalk Moderator
Posts: 24852
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
08-11-19 02:48 PM - Post#2772975    
    In response to acardon

The problem started before a key cylinder swap. I think it can only go in one way. I remember replacing the turn level switch. The block module wiring was disconnected for replacement. For more than a year it didn't do it. However, after selling it to my friend, he had it parked for several months. When he started to drive it daily or often, that's when the problem started.

So either the red or purple wire would be good to splice into for a switch?

Could the ignition lock housing be worn out from use?

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


Edited by gchemist on 08-11-19 02:51 PM. Reason for edit: No reason given.

 
65_Impala 
Very Senior Member
Posts: 4233

Reg: 12-29-02
08-19-19 09:49 AM - Post#2773554    
    In response to gchemist

Isn't the switch and tumbler two different parts? It is on most GM's. Might need to change the switch.

Purple seems to be the color used for the solenoid wire on pretty much any GM.



 
gchemist 
Senior Chevytalk Moderator
Posts: 24852
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
08-20-19 06:33 AM - Post#2773640    
    In response to 65_Impala

Do you mean "ignition lock housing "?
ACDELCO 26036474?

acardon has a harness pic. RockAuto has them. However there are different versions. I need more info to determine out 2-3 which one would swap.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
65_Impala 
Very Senior Member
Posts: 4233

Reg: 12-29-02
08-21-19 01:14 PM - Post#2773768    
    In response to gchemist

Not the mechanical parts. You said you replaced the key cylinder or tumblers, the mechanical part the key goes into. Yes, I think it's the switch in that harness picture posted.

Ignition switches have a single moving part actuated by the cylinder that either slides or rotates to the various electrical positions. This means if the electrical switch was good and being moved to the start position then the ignition power would also be on and it'd be starting. So, it's not likely the mechanical part is buggered up and moving the electrical switch to the crank position.



 




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