Marine Electronics Forum - New washdown pump - wiring question

THE HULL TRUTH is the world's largest FREE network for the discussion of Boating & Fishing. Whether you're researching a new boat, or are a seasoned Captain, you'll find The Hull Truth Boating & Fishing Message Forum contains a wealth of information from Boaters and Sportfishermen around the world.




TN Formula
03-28-2012, 06:46 AM
i've installed a new washdown pump on my cruiser and have a question about the wiring and fuse. the pump says it has a 11.7 amp max draw and requires a 5 amp fuse. does this make sense?? when i removed the old pump i also removed the old wiring since it wasn't marine wire. i'm wondering where would be the best spot to get power from? there really isn't anything close to the pump except one of my house batteries and a starter selonoid. would it be ok to use one of these as a power supply and put an inline fuse there? from the pump to the switch location and back to one of these two power sources would be about 16 feet. would i be ok with 14ga wire? also, would the pump need to grounded in any special way to help prevent any type of electrolysis or corrosion? i have a galvanic isolator on board but i really just don't understand how all that stuff works.

thanks for any info that might help:)


BACKTOTHESEA
03-28-2012, 07:08 AM
you can go up to 25 feet total circuit length with 14 wire to 5 amps.

I would tie into the house battery with an inline fuse.

The pump must be grounded (black wire) to a common ground to work.

Where are you mounting the switch? Is there common power or a power bar there?

TN Formula
03-28-2012, 07:51 AM
no there is no power supply near where the switch will be installed. i knew the pump had to be grounded, just wasn't sure if i needed to do anything special to prevent corrosion or electrolysis as it relates to the galvanic isolator.


Buoy Scout
03-28-2012, 09:41 AM
I would use a 20 amp fuse and 12 gauge wire. The fuse protects the wiring, not the device.

TN Formula
03-28-2012, 01:07 PM
ok, do you have an opinion on where to get power? any reason not to tie into a house battery or the starter selonoid? if i use one of these options i can keep the length of the run to a minimum.

savage
03-28-2012, 04:37 PM
ok, do you have an opinion on where to get power? any reason not to tie into a house battery or the starter selonoid? if i use one of these options i can keep the length of the run to a minimum.

The starter only gets juice when you turn the key over to start the engine.
I would try to wire that pump to a buss bar with your other equipment, such as lights, horn, blowers.

wingless
03-28-2012, 04:48 PM
The maximum current draw on a DC motor is when the motor rotor is stalled, power applied, but not rotating. The typical draw will be much lower.



Search Engine Friendly URLs by vBSEO 3.2.0