Heloc application primary residence before moving into next primary residence

[Evangelina Obana]

Hi to all 

I am a brand new to this BP and a completely beginner investing in real estate.

I have applied for a second mortgage for my next primary residence and on the process hopefully closing at the end of August (brand new home), now I have contacted some credit union to apply a HELOC and advised me to apply before closing of my current primary home. If I will apply now for HELOC does it affect my credit score for my next primary application) The builder just pulled again my credit last 5/21/24 (for the second time), Does it affect in any circumstances my loan will fell out with the builder?, The builder told me that as long as my HELOC is zero balance on closing that will be okay, but I did not ask them if it will drastically lower my credit in case they will pull again for the third time with the builder. I am planning to get this HELOC before closing in order to buy another 3rd investment if God's willing. Any sincere advised will be much appreciated,

thank you so much.

Eva