truck won't shut off

1965-1971 Datsun 521 forums. All 520 and 521 topics and discussion can be found here.
hashs521
Posts: 1
Joined: Mon Dec 30, 2013 6:11 pm
Car: 70 datsun 521

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Hey guys i have to choke the motor off because the key wont shut it off but still starts it the cylinder feels normal and the truck stays in accessory when off can someone pls help me out 1970 521


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farmtruck
Posts: 5
Joined: Sat Feb 15, 2014 11:25 pm
Car: PL521

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Is it actually running or is it dieseling when you shut off?
To low of octane gasoline/ extreme lean idle/too much advance will do that.

If the ignition is actually staying on:
Star & run wires may be landed/connected wrong on the switch or elswhere.
Some one has done some wiring work that has inadverdently bypasses the ignition contacts on the switch.
Power to alternator field not being properly cut off at shutdown and it is still self exciting /sending power to the ignition.
Ignition switch may be bad.
Check all the simple stuff first.


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