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boat electrical problem - stump the chump edition UPDATED

Posted on 9/1/17 at 7:09 pm
Posted by mack the knife
EBR
Member since Oct 2012
4183 posts
Posted on 9/1/17 at 7:09 pm
i have 12 volts to the fuse block, 12 across the fuse block, 12 volts from the hot side of the fuse block to every fuse, continuity - not 12 volts - from the ground/black side of the fuse block back to the battery. my conclusion is bad ground. i put in a new ground wire and still don't have power. wtf?
i have checked the battery, it has 12 volts
from the battery to the perko is 12 volts
across the perko is 12 volts
from the perko to the fuse block is 12 volts
across the fuse block is 12 volts
tia and for your effort enjoy:


turns out that i made a mistake. i didn't have power to the fuse block as i origionally thought. problem solved.
i was testing for power to the block by touching the perko (which has 12 volts) and the hot/red side of the block. all i was doing then was confirming 12 volts at the perko.
not sure if im explaining this correctly
This post was edited on 9/2/17 at 6:55 pm
Posted by QuietTiger
New Orleans
Member since Dec 2003
26256 posts
Posted on 9/1/17 at 7:16 pm to
Judging by the pic you are over fused!
Posted by MarlinMan
BSL
Member since Sep 2007
2533 posts
Posted on 9/1/17 at 7:17 pm to
Any fuses blown?
Posted by QuietTiger
New Orleans
Member since Dec 2003
26256 posts
Posted on 9/1/17 at 7:19 pm to
So everything on the block it down?
Posted by mack the knife
EBR
Member since Oct 2012
4183 posts
Posted on 9/1/17 at 7:23 pm to
all the fuses on the block are fine - not blown. but nothing works: no vhf, no gps/depth finder, no aerators, no running lights, no radio, no bilge, no power pole.
the outboard is wired directly to the battery and will crank and trim up/down
Posted by QuietTiger
New Orleans
Member since Dec 2003
26256 posts
Posted on 9/1/17 at 7:29 pm to
Probably getting a back feed thru your on board stuff reading 12v. Sounds like, as always a ground problem. Secondary system boat wise? I would guess loose connection, but that's just me.
Posted by QuietTiger
New Orleans
Member since Dec 2003
26256 posts
Posted on 9/1/17 at 7:45 pm to
I don't know how DIY you are, but you can bypass the battery feed after disconnecting it from the terminals and refeed. Meaning bypass the feed to the fuse block to the battery.
Posted by SeaPickle
Thibodaux
Member since May 2011
3132 posts
Posted on 9/1/17 at 7:51 pm to
Find a new ground location would be my first test.
This post was edited on 9/1/17 at 7:52 pm
Posted by mack the knife
EBR
Member since Oct 2012
4183 posts
Posted on 9/1/17 at 7:52 pm to
quote:

I don't know how DIY you are, but you can bypass the battery feed after disconnecting it from the terminals and refeed. Meaning bypass the feed to the fuse block to the battery.


i think i know what you are saying. isn't that what i did when i put in a temp jumper for the ground wire?
Posted by tilco
Spanish Fort, AL
Member since Nov 2013
13470 posts
Posted on 9/1/17 at 8:04 pm to
Either bad ground or you got a house fuse somewhere back towards the battery. Mine is mounted on the backside of the transom near my battery switch.
Posted by mack the knife
EBR
Member since Oct 2012
4183 posts
Posted on 9/1/17 at 8:05 pm to
quote:

SeaPickle

quote:

Find a new ground location would be my first test.


why wouldn't you ground back to the negative terminal on the battery?
Posted by hogdaddy
Krotz Springs
Member since Feb 2010
5153 posts
Posted on 9/1/17 at 8:18 pm to
How many battery's onboard?

If you have two make sure you are using the ground (negative) from the same battery that your are powering the fuse block. You could also tie the grounds together.
Posted by mack the knife
EBR
Member since Oct 2012
4183 posts
Posted on 9/1/17 at 8:23 pm to
3 batteries, but 2 of them for the 24 volt trolling motor only. i'm positive there is no connection between them. the 2 trolling motor batteries are inside the console and the starting battery with accessories is in the rear of the boat.
i'm really at a loss here.

edit for hogdaddy's question:
i'm certain the grounds are not "confused". everything was working fine till a few weeks ago. i thought the ground may have rubbed on something and developed a fault. but with a new ground in place and the same thing happening?????
This post was edited on 9/1/17 at 8:27 pm
Posted by Drop4Loss
Birds Eye Of Deaf Valley
Member since Oct 2007
3849 posts
Posted on 9/1/17 at 9:03 pm to
You sure your volts are good , battery ?

A fully charged battery should/can read 13.5 v
Posted by mack the knife
EBR
Member since Oct 2012
4183 posts
Posted on 9/1/17 at 9:21 pm to
quote:

Drop4Loss


checked it twice
Posted by Grassy1
Member since Oct 2009
6249 posts
Posted on 9/1/17 at 11:00 pm to
Not thinking this is it, BUT... make sure everything you're testing is rum from the battery that you're working with...

Ive made that mistake.
Posted by weisertiger
Lake Charles, LA
Member since Sep 2007
2479 posts
Posted on 9/1/17 at 11:15 pm to
Is your kill switch all the way plugged in?
Posted by mack the knife
EBR
Member since Oct 2012
4183 posts
Posted on 9/2/17 at 5:14 am to
yep, the outboard starts and runs fine
Posted by thejudge
Westlake, LA
Member since Sep 2009
14036 posts
Posted on 9/2/17 at 6:09 am to
quote:

12 across the fuse block


When you say 12 volts accross the fuse. Are you putting your test leads across the fuse itself getting 12 volts?

If you are it's blown. You should get zero volts across the fuse if it's good meaning you have no potential and are essentially reading your leads as shorted. If the fuse is open you will read 12 volts directly across the fuse.

It can trick somepeople.
Posted by kengel2
Team Gun
Member since Mar 2004
30677 posts
Posted on 9/2/17 at 6:58 am to
Ya, id switch the multimeter to resistance if he cant visually see that its blown. Be real easy then.
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