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Mechanic Martyn
Mechanic Martyn, Mechanic
Category: Car
Satisfied Customers: 1002
Experience:  Advanced trade certificate in Automotive engineering
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We relaced the ignition switch

Resolved Question:

1979 MGB - When we turn the key to the off positon, the car will not turn off. We relaced the ignition switch. The car would then turn off for the first 2 days after the new ignition switch was installed. Then it went back to continuing to run after the key was in the off position.
Submitted: 5 years ago.
Category: Car
Expert:  Mechanic Martyn replied 5 years ago.

Hello and welcome to Just Answer.

Does it run smoothly or a little rough?

 

regards

Mechanic Martyn

Customer: replied 5 years ago.

It runs smoothly.

Expert:  Mechanic Martyn replied 5 years ago.

Hello again

Has it had any modifications to the ignition system or wiring?

 

regards

Mechanic Martyn

Customer: replied 5 years ago.
Relist: I still need help.
Expert:  Mechanic Martyn replied 5 years ago.

Hello again

Does it have the original ignition system in it or has it been modified. Many cars of this age have had their ignition systems upgraded?

 

regards

Mechanic Martyn

 

Customer: replied 5 years ago.

We just installed a new ignition switch when the car would not shut off when the key was in the off position. The new ignition switch worked correctly for two days and then it went back to not shutting off again. That is all that has been done to the ignition system.

Expert:  Mechanic Martyn replied 5 years ago.

Thank you

I worked on these when they were new.

I am very familiar with the ignition systems. I cannot come up with any reason other than another faulty switch for this to be happening.

Thats why I asked if there had been any other modifications.

If you unplug the switch when the car is running does it stop?

regards

Mechanic Martyn

 

Customer: replied 5 years ago.

 

We took the plastic cowl off so we could unplug the switch like you suggested.

My husband started the car one more time before he was going to unplug the switch. When he turned the ignition switch off, the car turned off like it should and it has worked corectly since then. Thank you for your ideas on working through this problem. Where is the ACCEPT button so I can pay you?

Expert:  Mechanic Martyn replied 5 years ago.

Hello again

I am pleased its working - you might find the switch isn't returning internally when you turn the key back.

regards

Mechanic Martyn

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