Jim, I use a strip of stainless steel to drop the voltage on my winches for speed control. This is much easier than pulsing. You could run a similar strip of stainless in your drive circuit of your retriever. Try 1" wide, .032" thick and about 18" long to start with. With a meter you could check the voltage across the motor under load and trim the length to get the power you need.
Eddie the Eagle
Here is the deal� I have a Rahm winch retriever that uses a ford longshaft motor, and is generally run from a 6v battery to keep the retrieve speed down. Using the 6v battery is a pain in the butt, since when it dies there is never a backup around and it needs to be maintained separately. Recently I have been running the retriever on 12v. It works but is VERY fast � too fast for comfort. The thing I like is that we run it off the same battery the winch is using so it�s one less battery to lug around. I tried dropping the voltage a bit with a big high current diode (fairly expensive) but the effect is not very noticeable. Then I thought I could
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