Hello,
Yes it would be okay to just take off the negative battery cable,
Here is a guide that can help
https://www.2carpros.com/articles/how-to-replace-a-car-battery
Please let us know if you need anything else to get the problem fixed.
Here are some guides if you want to replace the ignition switch
Cheers, Ken
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Monday, July 10th, 2017 AT 1:53 PM