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Please check the following definition of haywire from Merriam-Webster Dictionary.

haywire:

Etymology: from the use of baling wire for makeshift repairs
1 : being out of order or having gone wrong <the radio went haywire>
2 : emotionally or mentally upset or out of control : CRAZY<is going haywire with grief>

Question:

What are makeshift repairs?
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"makeshift repairs" means repairs that you have to do on-the-go, in the field, or quickly, not repairs that you bring to the repair shop where you have all the tools you need.

(This was interesting to read. I had never heard that origin before.)

Do you know what baling wire is?
Comments  
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My understanding of the term is that it means 'repairs on the go'. For example, a farmer is walking along his fence and he sees part of it broken down. He takes some baling wire from his pocket and fixes it. That's a makeshift repair. Or you're driving in your car and it breaks down. You open up the trunk and take out the tool kit and fix what is wrong right there, then off you go again -a makeshift repair. But if the farmer calls up a contractor to fix his fences, or if you book your car in for repairs with a mechanic, those are not makeshift repairs.
Grammar Geek"makeshift repairs" means repairs that you have to do on-the-go, in the field, or quickly, not repairs that you bring to the repair shop where you have all the tools you need.

(This was interesting to read. I had never heard that origin before.)

Do you know what baling wire is?

Perhaps, it is a wire which is used to wrap/bind goods/merchandise into a bale.

What do you say?
Used to form hay into bales.

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