27 MAGNUM

Ended up doing it with 10 and know to replace 1 fuse at a time if they blow. Thanks to this great site a guy did up a drawing that even I could understand. I can't thank this guy and all of you enough, I have finished the trim pump wiring and moved on to wiring up the engine side of the plug. Here is the drawing I couldn't get it resized without using crop so a the pumps and the back of the switches are missing in the pic, but is was all there for me. Thank you OSO!

sunchaser796

HEY!!!!! That looks familar. Wonder where that came from ?????

Audiofn

Make sure you pull one of the fuses out of one trim pump on each side as two in parrallel like that will be twice the rated amps. Other then that it looks good.

502ss

iTrader: (3)

Does anyone know what the fuse size is for the trim pumps? I have seen 20 amps listed in this post but is that for the switch or the actual pump motor, I am looking for the pump motor fuse size?

Thanks

sunchaser796

90 amp fuse block from mercury marine. Should be a white casing

502ss

iTrader: (3)

Thanks Man!

sunchaser796

if anyone needs help with trim or drive pump wiring from dash to pumps or rocker switch mounted in throttle handles you can pm me and I will help out as much as possible. I do alot of wiring and rewiring on performance boats as well as others. All you need to to do is just ask and I will will help you out.
Warren

502ss

iTrader: (3)

OK, After looking at the pump I realized that the pump has 12 awg wire feeding the motor, That size wire can only handle a maximum of 45 amps. Why would the fuse need to be twice the size of the rated capacity of the wire?

sunchaser796

That is something you have to take up with Mercury Marine. The wires are short enough to with stand high amperage loads. Don't remember when the last time I saw wires burnt up on the pumps. BTW, the breakers on the starter motors are 129 amps. Go figure !!But Mercury designed it and hours of t & d . And it works !!