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That is typically what happens when the battery terminals are connected to the wrong polarity on the battery.
The oil light is turned on when it receives a ground and the running lights will as well when the ground becomes positive. I would suggest verifying the polarity of the battery and the position of the battery cables.
If all this is correct then disconnect the battery and check the polarity of the battery with a volt meter. There are times when new batteries leave the manufacturer with the incorrect polarity.
If all this turns out not to be the problem then let me know and, using your volt meter, we can begin to troubleshoot.
I hope this helps. Please let me know if I can be of further assistance. Also, please leave a positive rating for my service today. Thanks, P.J.
Are you testing with a volt meter? Do you have a volt meter with a continuity setting? Are you familiar with how to use it?
There is only one way to get power to the grounds and that is a wire in the wrong position somewhere. If it was a just a short circuit either the maxi fuse would blow or the wire would melt and break.
Is there anything else connected to the battery other than the main two cables? Something like a battery tender connection. This would be a possibility, as well as a bare spot on the positive cable, or an issue down around the starter solenoid terminals.