Section 615 - Prohibited provisions of contractA. No installment sale contract shall be signed by any party thereto when such contract contains blank spaces to be filled in after such contract has been signed. This provision shall not apply to serial numbers or other identifying marks which are not available for description of the motor vehicle at the time of execution of the contract.B. No installment sale contract shall contain any acceleration clause under which any part or all of the time balance represented by payments, not yet matured, may be declared immediately payable because the seller or holder deems himself to be insecure. This provision shall not affect an acceleration clause authorizing the seller or holder to declare the entire time balance due and payable in case of default in the payment of one or more installment payments, or in event of buyer's failure to pay taxes levied against the vehicle, or in event of buyer's failure to furnish proof of payment of taxes levied against the vehicle, or use of the motor vehicle for illegal purposes.C. No installment sale contract shall contain any provision authorizing any person acting on behalf of the seller or holder to enter upon premises of the buyer unlawfully, or to commit any breach of the peace in the repossession of the motor vehicle or collateral security.D. No installment sale contract shall contain any provision whereby the buyer waives any right of action against the seller, holder, collector-repossessor or other person acting on behalf of the holder for any illegal act committed in the collection of the payments under the contract or in the repossession of the motor vehicle or collateral security.E. No installment sale contract shall contain any provision whereby the buyer executes a power of attorney appointing the seller, the holder, a collector-repossessor or the agent of such licensee as the buyer's agent in collection of the payments under the contract or in repossession of the motor vehicle sold or collateral security. This provision shall not apply to a power of attorney issued by the buyer to an attorney-at-law to be used only in the collection of the obligation by legal process.F. No installment sale contract shall contain any provision relieving the holder, or other assignee, from liability for any legal remedies which the buyer may have had against the seller under the contract or under any separate instrument executed in connection therewith.G. No installment sale contract shall require or entail the execution of any note or series of notes by the buyer, which when separately negotiated, will cut off as to third parties any right of action or defense which the buyer may have against the original seller.1947, June 28, P.L. 1110, § 15. Amended 1961, Sept. 23, P.L. 1614, § 2.