A bit odd-according to the manual, the '52 and '53 Manhattan wiring diagrams are the same, and it is the '52 Deluxe that differs from the others. In another section, however, it mentions that '53 models have a new directional signal connector plug, cigar lighter lamp, and trunk compartment lights. It would appear that these three items might be the ones that you would have to look at, particularly the directional connector. Would seem a fairly minor modification at most. The harnesses would appear to be functionally the same, but with varying details at the ends.
