(2) When such subsequent purchases are made, if the seller has retained title or taken a lien or other security interest in any of the goods purchased under any one of the contracts included in the consolidation:
(a) The entire amount of all payments made prior to such subsequent purchases shall be deemed to have been applied on the previous purchases; and
(b) The amount of any down payment on the subsequent purchase shall be allocated in its entirety to such subsequent purchase.
(3) The provisions of subsection (2) of this section shall not apply to cases where such previous and subsequent purchases involve equipment, parts or other goods attached or affixed to goods previously purchased and not fully paid, or to services in connection therewith rendered by the seller at the buyer’s request. [1963 c.489 §11]