bilge blowers

[dento29]

Hey all,

I'm at present doing a big refit and want to wire my two bilge blowers (fused) to my 200mr mercruiser engine..
so when i turn the key they come on-no swithes to remember!
question is what do i wire it to?

 

[Anthony]

So you want them to be blowing all the time the engine is on?

 

[dento29]

You got it...

 

[Shiver Metimbers]

One method you could use, a car/caravan fridge relay wired from the Positive of the alternator. Fan will run once engine starts and will stop when engine stops, no switches to remember.

http://www.towsure.com/product/562-Fridge/Battery_Combination_Relay

 

[dento29]

thanks sharkbait, just what i needed!

 

[pvb]

[ QUOTE ]
I'm at present doing a big refit and want to wire my two bilge blowers (fused) to my 200mr mercruiser engine..
so when i turn the key they come on-no swithes to remember!

[/ QUOTE ]Is the 200mr a petrol engine? If so, isn't the idea to switch the blowers on for a while before starting the engine?

 

[dento29]

fair point, any ideas? ..or is gonna have to be a swith?

 

[pvb]

When I had a petrol engined boat, I ran the blower for about 5 mins before starting the engine (just to be on the safe side!). You could fit a system which wouldn't allow you to start the engine until the blowers had been running for a certain time, but this could be frustrating if you wanted to do a number of frequent stop-start manouevres. You could wire a relay, as already suggested, so that the blowers run when the engine's running, just in case you forget to turn them on. But I think you just need to get into a routine.

 

[NormanS]

I'm no electrical expert, but it should be possible to feed them through a relay from the ignition switches. Then you turn the key 5 mins before starting up to ventilate, and blowers will stay on as long as key is operated. i.e. until you stop the engines.

 

[Shiver Metimbers]

Rather than wire the relay to the positive of the alternator, wire it to the ignition (live when switched on) terminal. As suggested, turn on ignition a few minutes before start up. With this method you could do away with the relay and wire the fan direct with an "in-line" fuse. You may have to up rate the ignition fuse depending on what amperage your fan will draw.