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wdr

DPDT switch for Bakes 1100 ballast upgrade

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wdr

I have researched (on here as well) and seen varying opinions of using inline relays for both ballast pumps (fill/drn) with a single DPDT switch. I am leaning toward putting them in for the safety of the electrical system, but don't want to throw money away if I don't need to. Opinions from those of you in the know or have already done this would be greatly appreciated. Thanks Bill.

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Earmark Marine

A MUX switch should be used as a trigger only and not carry any form of current.

A typical marine-rated switch will handle 15 amps of DC current. Verify this with your particular switch.

A relay is rated for intermittent usage so I would limit a 30 amp relay to 12 continuous amps and limit a 40 amp relay to 15 continuous amps.

A relay can have the advantage of being placed close to a pump or other device so that you are able to keep the heavy supply wire much shorter and lower in-line resistance. Then the wire from the switch can be lighter gauge since its a trigger only and carrying no current to speak of.

Just a few general guidelines.

David

Earmark Marine

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Bobby Light

I have researched (on here as well) and seen varying opinions of using inline relays for both ballast pumps (fill/drn) with a single DPDT switch. I am leaning toward putting them in for the safety of the electrical system, but don't want to throw money away if I don't need to. Opinions from those of you in the know or have already done this would be greatly appreciated. Thanks Bill.

I'm assuming you're tying into existing pumps for the install? No a relay is not necessary. Unlike the older switches the Mux switches do not carry the current, they are connected to a fused panel that carries the current. On the bakes system you only need to increase the fuse rating of the pump you are tying into. The ballast pump fuses are 5 amp, I switched mine out to 7.5 amps and have been using them and trouble free for over 2 years now.

Edited by Bobby Light

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wdr

I read on here that the MUX wouldn't handle the load and wouldn't of any way because with my luck "Murphy" would of taken down the whole electrical system and this would be the last thing the wife would ever let me do to the boat :mad: I am going to wire it directly with inline fuses just after the switch and ground to the grounding block under the dash. I will am going to run the hot wire off of a constant hot wire (not the ignition switch), is there one that would be preferably to any other wire? Thanks guys I appreciate your insights in all of your posts. :thumbup:

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Bobby Light

I read on here that the MUX wouldn't handle the load and wouldn't of any way because with my luck "Murphy" would of taken down the whole electrical system and this would be the last thing the wife would ever let me do to the boat :mad: I am going to wire it directly with inline fuses just after the switch and ground to the grounding block under the dash. I will am going to run the hot wire off of a constant hot wire (not the ignition switch), is there one that would be preferably to any other wire? Thanks guys I appreciate your insights in all of your posts. :thumbup:

The mux does not carry the load, it triggers the on/off funtion to the medallion box. The medallioin box handles all the current. If you wire it the way you describe how do you plan on turning the pumps on/off, you'll have to tie into the mux funtion somehow if you want to use it to turn the pump on/off?

Edited by Bobby Light

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wdr

I was going to wire it stand alone and not use the MUX. That way I can remove it later if a new boat should appear.

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Bobby Light

I was going to wire it stand alone and not use the MUX. That way I can remove it later if a new boat should appear.

Ok I thought you were tying into the existing pump. If you're just going to add a rocker switch you shoulddn't need a relay either if you are only running one pump off each pole in the switch. The rockers switches that malibu used were rated at 10 amps and they didn't run a relay, a stock 750 gph aerator pump only pulls 5 amps. You could pull your ground/power from the buss bars on the drivers side for that. If you wanted to run dual relays for the install you'd only be looking at about $10.

Edited by Bobby Light

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spencer

Carling-Technologies-Contura-Ballast-Rocker-Switches_1.jpg

Here is a little graphic from Carling Tech. It is a pain to put them back together sometimes. Hope this explains a little bit about what is going on inside.

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