I don’t know your coach build specifics, but in my ACE there is a 30 amp fuse in the 12VDC fuse/converter panel that powers the slide controllers (2 slides). The DC fuse/converter panel is located at the end of the bed and there is an ignition interlock relay mounted under the bed (along with some other major electrical systems like transfer switch etc). If the ignition key is inserted (or engine running) the lockout relay will operate and disable the power feed from the 30 amp fuse to the slide controllers. There is nothing in my coach to prevent starting the engine when slides are out. By the way, the awning motor power is also disabled if the ignition is enabled. If your awning is out can you start your engine?
If your coach was built not to allow engine start when the slide was out, it would “likely” use a micro-switch that operated when the slide was fully extended. If that is true, then a partial slide extension should still allow your engine to start? I am just speculating here. The Dealer should be able to confirm if your situation is normal for your unit. You could also have other strange issues like an ignition switch intermittent problem; or maybe a loose connection. Let us know what you find out......so we can learn along with you.
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