Knocking noise in dash ( not under the hood) upon starting car

BillBBBillBB Member Posts: 1
edited November 2019 in GMC
Upon starting the car there is a knocking noise coming from the center dash. This is a loud noise that stops after about 15 knocks. But happens upon each start.
Became louder when a new battery was installed.
Also, even after a new battery, the car is slow to start.
Any ideas?
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