Mercury 75HP

[Fugazi]

My power trim is only working in one direction (down) when using the control box rocker switch, it works fine in both directions using the cowl mounted switch.

 

Does anyone have a wiring diagram for a 2004 Mercury 75HP?

 

or can help with diagnosing if my control lever power trim switch is U/S?

 

There are 5 pins in the control box electrical connector marked A - E which one is the trim up pin?

 

Gordon H

 

 

[TomBettle]

Drop it down to Paul at Yellow Penguin

[great white]

Gordon

 

If you can not get the wireing diagram have a look at the wire colours on the cowl switch that is working.

 

the same wire colours at the control box should give it away. black is usually the common earth.

 

if you think you have worked it out, try swapping the wires, if it now motors up and not down it may well be just a U/S switch.

 

good luck

Charlie

 

 

[diverdave]

This might help

 

http://books.google.co.uk/books?id=e2t3tCW...esult#PPA116,M1

[Fugazi]

This might help

 

Certainly does.

 

Thanks,

Dave

 

[great white]

Looks straight forward like that

 

G/W [Green/White] is down from either switch and L/W [blue/White] up

 

after the relays its

Green wire to the trim motor for up and Blue for down.

 

should be reasonably easy to see if its a switch or wiring problem.

 

Good luck

Charlie

[Fugazi]

Thanks Charlie,

 

Armed with the wiring diagram that Dave put on as a link yesteday I was able to establish very quickly with my multimeter that the trim switch is fine. So the fault is somewhere in the blue/white lead between the control box and the engine. I suspect its a corrosion problem in a connector at the engine end, but due to the weather today, I'll leave it for a dry day to lift off the engine cover and sort it out.

 

Gordon H

[Jim]

One thing to remember:

Your multimeter can show the switch as working, But it may not be supplying any " oomph " I had this on Small Fry. My GPS and Radio would not work when I bought the boat. New switches fixed it.

 

Jim

[Fugazi]

Good point Jim, but just to make sure I by-passed the trim switch using the common power feed to it and it still only worked on the down trim.

 

Thanks

Gordon H