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Old 08 January 2014, 11:41   #11
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Originally Posted by gotchiguy View Post
There has been a lot of bad press for the Off-1-2-Both switches, they have a tendency to fry engine EMMs/ECUs I believe, and may invalidate your warranty I think I read somewhere..
have had friends with similar experience

btw : looking at yr schematics...this is a realy nice feature on these evinrudes!
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Old 08 January 2014, 12:20   #12
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Originally Posted by gotchiguy View Post
There has been a lot of bad press for the Off-1-2-Both switches, they have a tendency to fry engine EMMs/ECUs I believe, and may invalidate your warranty I think I read somewhere..
I'd like to see more about this if it is the case (I've never heard that.)

Just about all battery selectors are make-before-break switches, which won't cause a problem unless switched to OFF with the motor running.

jky
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Old 08 January 2014, 15:07   #13
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Quote:
Originally Posted by gotchiguy View Post

There has been a lot of bad press for the Off-1-2-Both switches, they have a tendency to fry engine EMMs/ECUs I believe, and may invalidate your warranty I think I read somewhere..
I would certainly like to see your references to frying ECU's, this is something I have never heard of before and am interested in learning more.

As stated earlier, I've had nearly 7 years of trouble free running using this set-up. I must admit to changing the battery selector position before starting the outboard though. The Evinrude stealer didn't mention anything about warranty when he PDI's and set-up the outboard.
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Old 08 January 2014, 15:09   #14
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Originally Posted by jyasaki View Post
Just about all battery selectors are make-before-break switches, which won't cause a problem unless switched to OFF with the motor running.

jky
Same as every other main electrical isolator then?
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Old 08 January 2014, 19:05   #15
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Thanks for all the help guys.

I think I now know how I'm going to do this, my O/B does indeed have the facility to charge two batteries independently so I'm going to use it. I'm not using a 1,2,1+2 switch as it doesn't quite do what I want it to. I'm going to use an off,on,both switch which will give me dual circuits but keep them entirely separate unless really needed.

I'd also like to know if anyone has actually known of anyone cooking an EMM using circuits/switches like this as again I've read the friend of a friend posts on the web but nothing first hand. If it could happen then I will fit one extra switch to enable me to completely isolate the second battery charging feed that comes from the O/B before flicking the master switch to 'both batteries' for emergency starting.

Cheers
Rob
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Old 09 January 2014, 01:01   #16
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Checked my 'friend of friend' and that was an idiot induced screwup ending with the switch in 'off ' mode at the wrong time and it had nothing to do with the switch itself apparently.......
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Old 09 January 2014, 04:04   #17
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I've fried an EMM, still not sure how it happened, could have been operator error The problem arises when you connect/ dis-connect a battery with the engine running, the subsequent surge blows the charging regulator which for some reason BRP decided to house inside a 1k computer. The golden rule is NEVER open or close a battery switch with an engine running. Make sure that ALL connections are good & tight. Use good quality switches & change them at the first signs of corrosion.
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Old 09 January 2014, 04:07   #18
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+1 for the Victron cyrix-I voltage sensitive relay
if you don't go for the engine- supplied circuit

I would almost call it idiot proof

I have a "start" battery and a "house" battery. I have a voltmeter gauge on the console connected to the start battery, and the Plotter shows the voltage on the house battery for judging the level of charge in each and that both are receiving charge

Although you can tell from voltages, It would be reassuring to have a light on the console to indicate the batteries are combined. Not all models do this.


http://www.victronenergy.com/battery...20a-225a-425a/
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Old 09 January 2014, 05:12   #19
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Originally Posted by desertrat View Post
Thanks for all the help guys.

I think I now know how I'm going to do this, my O/B does indeed have the facility to charge two batteries independently so I'm going to use it. I'm not using a 1,2,1+2 switch as it doesn't quite do what I want it to. I'm going to use an off,on,both switch which will give me dual circuits but keep them entirely separate unless really needed.

I'd also like to know if anyone has actually known of anyone cooking an EMM using circuits/switches like this as again I've read the friend of a friend posts on the web but nothing first hand. If it could happen then I will fit one extra switch to enable me to completely isolate the second battery charging feed that comes from the O/B before flicking the master switch to 'both batteries' for emergency starting.

Cheers
Rob
Just to throw in another option

I think from memory some of the Blue sea switches keep the contact when switching from 1 or 2 to both, I've not got the paperwork here, but their ACR has a lock out if the house battery drops below a set voltage and can't be charged to protect your starter battery

Jim
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Old 09 January 2014, 11:38   #20
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Same as every other main electrical isolator then?
Pretty much.

My point was that the battery selectors are purpose designed for, well, switching batteries, and shouldn't cause a problem if you don't disconnect everything while running.

jky
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