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yeah bypass that relay. If no luck You said it's only when it's cold so I assume it's more battery related.
At 5 degrees a fully charged battery has only half its rated amperage capacity.
Your starter solenoid needs approx 150 amps to move the plunger switch mechanism on your starter.
The next time you're going back inside, bring your battery with you and let it stay at room temperature. Bring it out in the morning and see what happens.
I suggest a battery with a higher cold cranking amperage rating. They have all kinds of heaters and battery blankets but I don't know how good those really are. Although a oil pan heater is always nice to have if you live in North Dakota.
You can always check your interlock relay simply by running jumper wires to it from a battery and hearing for it to click.
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