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Author Topic:   Electrical NOOB question
mako34 posted 04-24-2006 10:18 AM ET (US)   Profile for mako34   Send Email to mako34  
I am attempting to wire a fishfinder and bilge pump, the only way I can get either to work is by wiring them directly to the battery terminals with inline fuses. I have a 69 Katama and underneath the console I see 2 6-pair blocks with various wires attached to each, but when wiring wiring these devices to the block(s) they do not power up (with key in ON position). Everything else works, gauges, lights and so forth, any help would be appreciated I am lost with electrical. (I am reading the 12v bible currently)


Chuck Tribolet posted 04-24-2006 12:16 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
Stick your head in there and trace the wiring. And figure
out whether the pairs are connected within, or between the
pairs. There are several posibilities for how these are
hooked up:

One block is + and one is minus. In this case, perhaps only
part of each block is connected.

One side of each block is +, the other side is minus. Again,
perhaps only part is connected.

Those blocks are probably switched. Tracing the wiring will
let you figure out what they are switched by.

You probably don't want to wire either the fishfinder or the
blige pump to the ignition switch. I'd wire the bilge pump
to a bilge pump switch (exact type determined by type of
bilge pump (simple with no builtin switching, builtin float
switch, or smart (cycles until it feels no load)). I'd wire
the fishfinder to an accessory switch. Sounds like right now
the only accessory would be the FF (GPS and VHF are other
future candidates).


st posted 04-24-2006 12:22 PM ET (US)     Profile for st  Send Email to st     
Then you would need to find out what make this "block" to have power. Are you sure that there is no other switch that you can flip in order for other electrical device to work in your boat?
My gauges and gauge's light was controlled by the ignition key, but other accessories (bilge, fish finders, vhf radio) got's it's power from the "block", which is controlled by a "main" toggle switch. Keep in mind, that not only do you need the power (12 V battery voltage); you will also need the have a good ground point for the current to return to.
Good luck!
st posted 04-24-2006 11:42 PM ET (US)     Profile for st  Send Email to st     
Sorry if I sounded too over simplifying your problem. Also, when I was typing my reply above, Chuck already submitted his input; so I wasn't aware of what he was typing.
Actually, he covers the situation in more details than I, in fact I was basically saying the same thing he already elaborate: about the "switch".

Also, if you haven't done so, that "block" could also be fuse protected, so ensure that no fuse is open or blown.
If those 2 simple measures didn't find the culprit, then you'd probably need to start tracing the wiring-a multimeter will help-to find why there is no power to the block, tracing it back to the source: the battery.
Good luck!

mako34 posted 04-25-2006 10:23 AM ET (US)     Profile for mako34  Send Email to mako34     
Thanks for the input, a multimeter is my next step so I can see what terminals are live. Thanks.

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