HELOC or pre-approved mortgage first

[Ed Kelly]

I plan on investing in a vacation rental in the smokies. I'd like to get a HELOC on my primary residence to help with the purchase and/or future unexpected expenses. One of my questions is should I be looking to get pre-approved for a mortgage, or even close on the mortgage, before pursuing the HELOC? If I get the HELOC first, how does that impact getting pre-approved for a mortgage?

Thanks!