Current draw from older Merc type 1 power trim pump

[Moody Blue]

Wiring up this old system in my new to me boat. Want to put an overcurrent protection in-line for safety sake.

 

[Bondo]

Re: Current draw from older Merc type 1 power trim pump

Ayuh,...

Trim pumps are usually wired to the Battery,+ draw some pretty good amperage...

I really don't think you need to be Reinventing the wheel for it....

 

[Moody Blue]

Re: Current draw from older Merc type 1 power trim pump

Right you are, wired direct to the battery without any protection. In my mind that is a no-no.

Right or wrong, I want to put some protection device (fuse or circuit breaker) in-between the battery and the pump. Any idea what current draw this thing takes?

 

[Bondo]

Re: Current draw from older Merc type 1 power trim pump

Nope,...

But,.. If you look in the parts listings for the newer Merc.s,..
They have now gone to Lawyer Approved fuses mounted to the Hot wire, at the Starter....

I'm sure you could jury-rig 1 of those in place,+ I'm sure it'll handle the amperage....

 

[Don S]

Re: Current draw from older Merc type 1 power trim pump

Merc still recommends hooking them directly to the battery, but they do have the square block fuse (110A) mounted directly on the relays for the main power to the relay.
Here is a picture.

 

[waterone1@aol.com]

Re: Current draw from older Merc type 1 power trim pump

I had never researched what the rating was of those square fuses.....but I would trust Don. So the correct answer would be a 110 amp fuse. As far as I'm concerned, there should be a fuse on every hot lead, in this case a 110 amp.

 

[Don S]

Re: Current draw from older Merc type 1 power trim pump

The service manuals or the parts listing (oem) both list the amperage of the fuses.