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| While that connector can be an issue that four terminal connector only uses two circuits for starting, both main power supply. When those terminals corrode off you have no power to the cab and you will hear a slight buzzing when the key is turned on. To find that connector, remove the left fender a foam pad. At the base of the rear cab pillar you will see the harness and probably some connectors. There are several connectors buried in the cutout of the fuel tank. The problematic connector is a four pin connector that is not sealed. It is the only unsealed connector at that location.
I am still betting either the seat is broken around the seat switch or the seat switch or seat harness is bad.
If you need to see the schematics, I have them posted at another website, Haytalk.com. Go to the machinery forum. At the top of the forum list of threads you will see My NH Repair, etc. click on that thread. You should be taken to the first post in that thread, if not, navigate to the first post. On the first post you should see a list of subjects with links to each of the posts in that thread. If you do not see the list, scroll down to near the bottom of the first post and you should see “See More”. Click on see more. Once the list is shown, scroll down the list to the skid loader section. There you will find the list of wiring schematics. You want the L100 series with cab upgrade. I think it might be the last in the list. I put together the diagrams from individual pages so the diagram would be complete for the starting circuit. There are multiple pages in the post. I color coded the wiring for each circuit with each page adding another circuit until all the circuits are shown to start the loader. You will need to join the forum to view the diagram.
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New Hollland 175L skid steer
