Hi Bob
I don't know if you have a tilt or standard column, but I have had both in this one car. I purchased both of my turn signal switches from Rock Auto also, so I assume they were the same brand as you have.
I rebuilt and refinished my standard column first and installed all new switches. The non-tilt steering column turn signal switch came with a connector on it. As I recall, the harness on the new switch was a little shorter than the the harness on the switch I replaced. This did not present an issue with plugging in to the dash harness when I installed the standard column. Everything plugged in fine and worked properly. These are the only pics I have of the standard column.
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I purchased a tilt column and then restored and refinished that column. The tilt column turn signal switch was also bought from Rock Auto. That switch comes without a connector and I had to splice in the original connector to the switch. The tilt column turn signal switch you can make the harness as long as you care to by using more of the original switch harness.
A previous owner had obviously replaced the switch at one time and just twisted the wires together and wrapped with electrical tape. Obviously, that is not the way that I would recommend it to be done. I used solderless butt connectors and shrink wrapped them to try and make it a safer and more professional appearing repair.
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If you have a standard column and think the new switch harness is going to be too short you could splice the old switch connector and an extra 5" of wire to the end of the new switch harness and get your 5" back. The connector should be fine, unless a short in the past damaged it. the switch is what wears out and fails. Just an idea if you think the shorter harness is going to be an issue.
Tom