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09-09-2019, 08:03 PM
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#1
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Senior Member
City: FL
Vessel Model: Benneteau Swift 42
Join Date: Jun 2019
Posts: 469
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tracking down a bad circuit
Attachment 93784My engine room blower on port isn't coming on with ignition, starboard is working fine
I wired it directly and it works
looking at the wiring diagram it goes thru what I think is relay.
How can I find that relay among a zillion others
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09-09-2019, 08:40 PM
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#2
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,131
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I would follow the positive wire back from the blower.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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09-09-2019, 08:43 PM
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#3
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Senior Member
City: Oceanside, CA
Vessel Name: Tera Grace
Vessel Model: Californian 42 LRC
Join Date: Oct 2012
Posts: 197
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First, verify there is no voltage at the blower motor. If you measure 12 volts maybe the blower motor failed?
If you have no voltage you can use a signal tracer. Clip on the tone generator at the Blower motor. Use the wand to trace the wire back to the relay. If you know where the relays are located use the wand to find the correct relay.
You can get a signal tracer for around $20
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09-09-2019, 08:48 PM
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#4
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Guru
City: Gulf coast
Join Date: Aug 2016
Posts: 2,269
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I use a tone/probe type tracker for that. None of mine are top dollar. They are whatever cheap one I got nearby whenever I needed one and didn't have one handy.
Here are some sources:
-- https://www.homedepot.com/p/Sperry-L...4220/202520187
-- https://www.amazon.com/Extech-TG20-W.../dp/B00APD16D2
Basically, turn the breaker off to be safe, attach the red wire to the blower wire at the blower, then check each of the relays with the probe to see which one "rings". You can also follow the wire, and refind it after obstructions with the probe.
Depending upon the situation, hooking up the black wire will be helpful or not. The easiest way to tell without over thinking it is to see if it traces well a few inches down without it. And, if not, add it and see if it is better.
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09-10-2019, 12:35 AM
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#5
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Guru
City: Anacortes
Join Date: Nov 2012
Posts: 1,189
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Got a cheapy tone tracer too. Freakishly simple and effective. Sometimes though, you just gotta pull down a wire race, put your mittens on a wire and see where it goes.
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09-10-2019, 06:33 AM
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#6
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Senior Member
City: FL
Vessel Model: Benneteau Swift 42
Join Date: Jun 2019
Posts: 469
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ok, I'll give that a try today
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09-10-2019, 06:53 AM
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#7
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Guru
City: Bethesda, MD
Vessel Name: Solstice
Vessel Model: Grand Banks 47 Eastbay FB
Join Date: Feb 2018
Posts: 2,164
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+1 on the tone tracer. I had to use that to track down where they'd put a fuse for the anchor windlass. It was only by accident that I finally found it. We just couldn't determine where it went after it went behind the generator. I happened to have my (very sweaty) hand on the exterior of the metal box that had some other switches on it. I happened to press the probe button in my other hand... and heard the deedle-deedle-deedle of the probe! Turned out they'd buried a fuse BEHIND the panel.
I've used the probe for countless other circuit traces in the past (houses, AC, speaker, networks, etc) but this was, hands-down, the most satisfying result.
Looking at that circuit it appears they're tripping the relay with the same positive that powers the fuel gauges? Is the associated fuel gauge display for that side's blower also powering up?
And let's not forget to ask the obvious question, has there been any other work done anywhere else on the boat (that may or may not have involved wiring)?
__________________
-- Bill Kearney
2005 Eastbay 47 FB - Solstice, w/Highfield CL360 tender
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09-10-2019, 01:52 PM
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#8
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Senior Member
City: KEY COLONY BEACH
Vessel Name: Izzy Rose
Vessel Model: Grand Banks 49
Join Date: Aug 2017
Posts: 374
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I to would use the tone tracer works good have had to use it on my boat. I bought one to keep on the boat.
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09-10-2019, 03:41 PM
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#9
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Enigma
City: Slicker?
Join Date: Oct 2007
Posts: 16,541
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Greetings,
Mr. l. Check your ground connection and all connections, for that matter but check the ground first.
__________________
RTF
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09-11-2019, 07:57 AM
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#10
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Senior Member
City: Long Valley
Vessel Name: No Worries
Vessel Model: Beneteau ST44
Join Date: Mar 2019
Posts: 149
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Is that a relay, there is no ground on it and it is different than the other relays shown, can it be some sort of resetable breaker?
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09-11-2019, 08:00 AM
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#11
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Guru
City: Narragansett Bay
Vessel Model: Grand Banks 36 Classic #715
Join Date: Sep 2016
Posts: 1,856
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Quote:
Originally Posted by RT Firefly
Greetings,
Mr. l. Check your ground connection and all connections, for that matter but check the ground first.
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You stated that you wired it directly. Just wire the positive side directly. If it doesn’t work you have a ground issue as RT stated. If it does work focus on the positive side / relay.
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09-15-2019, 05:48 PM
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#12
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Senior Member
City: FL
Vessel Model: Benneteau Swift 42
Join Date: Jun 2019
Posts: 469
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Found the relay the beeper made it easier two of the same type were side by side, I pulled the other relay and star blower failed, so I know for sure I have it located
It's 4 pin relay, the writing on cover of the relay is not legible?
two heavier wires and 1 lighter gauge, I assume that one is from ignition.
I'll stop by Napa in the morning to if they have one
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09-15-2019, 05:53 PM
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#13
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Guru
City: Oconto, WI
Vessel Name: Best Alternative
Vessel Model: 36 Albin Aft Cabin
Join Date: Oct 2012
Posts: 3,145
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Pull the gas engines and install diesel engine or engines. Then you don't need a blower! Sometimes simpler than tracking a bad wire..
Good luck, you will love the diesels
pete
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09-15-2019, 06:08 PM
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#14
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Senior Member
City: FL
Vessel Model: Benneteau Swift 42
Join Date: Jun 2019
Posts: 469
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First of all it is diesel, never heard of no blower
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09-15-2019, 06:15 PM
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#15
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Guru
City: Gulf coast
Join Date: Aug 2016
Posts: 2,269
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Diesel fuel doesnt have explosive fumes and diesel, so there is one fewer reason to have active blowers for ventilation before it can be achieved passively underway, if not even while underway.
That's not to say that there arent reasons to have a blower or blowers with diesels, just that preventing Kaboom! isn't one f them.
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09-15-2019, 06:18 PM
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#16
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,131
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Usually with a diesel a blower is used either to supply combustion air or to remove heat from the engine room during and after a run.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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09-15-2019, 07:32 PM
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#17
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Guru
City: Southport, FL near Panama City
Vessel Name: FROLIC
Vessel Model: Mainship 30 Pilot II since 2015. GB-42 1986-2015. Former Unlimited Tonnage Master
Join Date: Oct 2007
Posts: 4,977
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Are your blowers "innies" or "outies." Reason I ask is as a new boat owner I ran the single EXHAUST blower ("outie") in the old trawler whenever the engines were running, and I was constantly burning out those 12-Volt POS Jabsco units. I learned to not run it except when the engines were shut down because it was trying to exhaust the air the engines were trying to inhale. Duh.
__________________
Rich Gano
FROLIC (2005 MainShip 30 Pilot II)
Panama City area
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09-17-2019, 05:44 AM
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#18
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Guru
Join Date: Oct 2007
Posts: 22,553
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Most folks avoid an "innie" blower as any exhaust leak would be fed into the living spaces.
When stationary the blower might move engine space warm air into the cabins as a fall evening heating solution .
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09-17-2019, 08:20 AM
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#19
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Guru
City: Southport, FL near Panama City
Vessel Name: FROLIC
Vessel Model: Mainship 30 Pilot II since 2015. GB-42 1986-2015. Former Unlimited Tonnage Master
Join Date: Oct 2007
Posts: 4,977
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Quote:
Originally Posted by FF
Most folks avoid an "innie" blower as any exhaust leak would be fed into the living spaces.
When stationary the blower might move engine space warm air into the cabins as a fall evening heating solution .
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Last thing I would want would be to move any hydrocarbon laden air from the ER to the cabin.
Inward blowers should never be needed in the design of a pleasure craft engine space, but I am hard pressed to think of a ship I was ever on without them.
__________________
Rich Gano
FROLIC (2005 MainShip 30 Pilot II)
Panama City area
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09-17-2019, 09:01 AM
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#20
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,119
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Ships I have been on tended to have airtight exits from machinery spaces...then again all but a few were "combatants" at some level of build.
I thought that the constantly manned spaces within machinery spaces were positive pressure to stay clear of smoke/fumes and that principle was for safety beyond war fighting capability.
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