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Author Topic:   Fishfinder mounting on MTK 170
BemidjiWhaler posted 05-11-2004 07:37 PM ET (US)   Profile for BemidjiWhaler   Send Email to BemidjiWhaler  
Information that came with my Eagle FishMark 480 suggests to connect power to an auxillery power switch in a salt water environment. This is to prevent electrolysis and corrosion. The auxillery switch on my MTK is available.

Eagle's information also provides for the installation of a 3 amp fuse wired into the power cable.

My question is, whalerologists, do I need the fuse if I wire to the auxillery switch in the Montauk? I'm not much of an electrician, but it looks like a 5 amp fuse on the auxillery switch. Any advice on mounting electronics?

And oh, how I hate to think about drilling holes in the console...


jimh posted 05-11-2004 08:33 PM ET (US)     Profile for jimh  Send Email to jimh     
Dave--In the CC of your MTK locate the MEP and install a IRW between the APCB and the FF. If you like put a CF in the circuit, or a CB. Use PVC and IRPT to insulate. Got it?
Barney posted 05-11-2004 08:50 PM ET (US)     Profile for Barney  Send Email to Barney     
Dave, For power to my 170 Montauk's fish finder, I went to the same auxillery switch and also installed the additional in line fuse specifically for the fish finder. JimB
Moe posted 05-11-2004 10:21 PM ET (US)     Profile for Moe  Send Email to Moe     
The 3A fuse in the fishfinder power line may be there to protect that wire gauge. I would only eliminate it if you replace the 5A fuse for the Auxiliary switch with a 3A fuse.


BemidjiWhaler posted 05-11-2004 10:54 PM ET (US)     Profile for BemidjiWhaler  Send Email to BemidjiWhaler     
jimh-like I said in my post, I'm not much of an electrician. I'm not sure if your reply was supposed to be funny or obnoxious. In either case, it wasn't helpful to me.


Maximus posted 05-11-2004 10:55 PM ET (US)     Profile for Maximus  Send Email to Maximus     
Am I the only one who got Jimh's joke?

Just put the 3 amp fuse in line with the AUX circuit breaker.

BemidjiWhaler posted 05-11-2004 11:00 PM ET (US)     Profile for BemidjiWhaler  Send Email to BemidjiWhaler     
Barney-Thanks for the info. I'll give your wiring advice a try when I get to Missisippi next week... I'm living in Minnesota, but I wintered my boat in Long Beach and I think you're close to there...maybe see you on the water


BemidjiWhaler posted 05-11-2004 11:27 PM ET (US)     Profile for BemidjiWhaler  Send Email to BemidjiWhaler     
jimh--by the way, are you back on that plutonium chicken medication again?


AQUANUT posted 05-12-2004 05:49 AM ET (US)     Profile for AQUANUT  Send Email to AQUANUT     
whatever happened to "in oreder to maintain this forum, in the archieval sense, we shall refrain from use abreviations such as mt170 and mtk?

in accordance with your request;
that data required to proccess such abreviations
has been purged.

please elaborate

cape_rover posted 05-12-2004 06:38 AM ET (US)     Profile for cape_rover  Send Email to cape_rover     
How did you mount the transducer? Is it whaler board in the transom so you drill, tap, and use a machine screw. Or is it wood so you drill and use wood screws?
ghefty posted 05-12-2004 08:29 AM ET (US)     Profile for ghefty  Send Email to ghefty     
jimh, Please, No TLA's
Barney posted 05-12-2004 08:32 AM ET (US)     Profile for Barney  Send Email to Barney     
Dave, I am close to Long Beach. Send me an email when you get down. I will be glad to show you my setup.

Cape, I followed the manufacturer's instructions on the transducer installation and used the provided screws for attachment to the transom. I did bed the setup with 3M 5200 and let it dry for several days.


jimh posted 05-12-2004 08:40 AM ET (US)     Profile for jimh  Send Email to jimh     
Geez, if everyone else can invent abbreviations, why can't I? As I have often mentioned, use of abbreviations, particularly ones you just made up yourself as some of mine were, don't help comprehension. Yeah, MTK might mean "Montauk" to some, but also consider how likely you are to search for the term "MTK" when looking for information about a Montauk.

Back to the electricals:

The advice to wire the SONAR device through a disconnect is what is important here. The manufacturer evidently thinks that if the device is left connected to the battery at all times, even though the unit is powered off, there may be some corrosion potential.

On a boat it is important that electrical devices not be left connected to the battery positive in the OFF state. Connection to the battery will elevate their galvanic corrosion potential, and may increase corrosion of anything underwater, like the transducer. This is the same advice that recommends always wiring the disconnect in the positive lead, not the negative lead.

So simply changing the fuse is not the recommendation. What is recommended is to put a switch, a disconnect, from the battery into the power lead. This is what is meant by wiring to an auxiliary power switch.

The switch may have more than one device connected to it, perhaps other electrical accessories, so you can leave its over-current protection at the rating of the disconnect and branch. You can also leave the fuse in the SONAR device's power lead, at a lower rating, to protect it against over-current damage.

jimh posted 05-12-2004 08:46 AM ET (US)     Profile for jimh  Send Email to jimh     
Abbreviations Used:

CC=Center Console
CB=Circuit Breaker
CF=Current Fuse
IRW=Insulated Red Wire
MEP=Main Electrical Panel
APCB=Auxiliary Power Circuit Breaker
FF=Fish Finder
IRPT=Irradiated Polyethylene Tubing

and my favorite,

TLA=Three Letter Acronyms

Can't figure it out, try:

What I find really humorous here is this:

BemidjiWhaler posted 05-12-2004 04:48 PM ET (US)     Profile for BemidjiWhaler  Send Email to BemidjiWhaler     
jimh-my humble apologies. I missed the humor in your post. But now I get it...shame on me, and no more TLA's from this guy...oops
InHerNet posted 05-12-2004 07:08 PM ET (US)     Profile for InHerNet  Send Email to InHerNet     
c m whaler
m r not whaler
m r bayliner
m r 2 whaler, c m smirk
u r right, m r whaler
BemidjiWhaler posted 05-12-2004 08:41 PM ET (US)     Profile for BemidjiWhaler  Send Email to BemidjiWhaler     
a u, c d whalers?
m n o whalers. m r bayliners.
o s a r whalers. c m?
i c m!

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