Review on DB Electrical TRM0008 Mercury 17649A1 by David Hayden

This SOMETHING worked and fitted my 1986 Mercruiser Trim Pump 3.7L inline 4 cylinder on a 1986 Larson DC-190 boat with an old style Alpha 1 drive that did not have an easy-to-fill clear plastic reservoir, similar to the plastic reservoir of a car's master cylinder. I only had one large pan head screw to check the fluid level. Anyway, there is a coupling (not included but present on the OEM motor) that connects the motor shaft to the pump. It is a cylindrical piece of metal about 3/8 inch in diameter with a slot at the top and bottom that connects the flat surface of the motor shaft to the flat surface of the pump shaft. The slot fits the width of the new motor perfectly, but the motor shaft protrudes further on this new motor than on the old one. I flipped the coupler and tried both directions as one of the slots is deeper but I couldn't get it to fit properly. I ended up installing some washers as spacers to allow the motor to be mounted without any pressure. This also required using long bolts from the old motor as the new motor doesn't use bolts that go all the way through the motor. Also maybe -because of the plastic case I couldn't get a good bottom and it's a bit bigger so it didn't fit perfectly with the old bracket on the side of the motor. I then had to run a separate ground for each of the relays to make it work well. I would just replace the entire motor and pump assembly for an additional $120 and get e-reservoir refill as an added feature.