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Old 09-09-2019, 08:03 PM   #1
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Question 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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Old 09-09-2019, 08:40 PM   #2
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I would follow the positive wire back from the blower.
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Old 09-09-2019, 08:43 PM   #3
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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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Old 09-09-2019, 08:48 PM   #4
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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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Old 09-10-2019, 12:35 AM   #5
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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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Old 09-10-2019, 06:33 AM   #6
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ok, I'll give that a try today
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Old 09-10-2019, 06:53 AM   #7
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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)?
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Old 09-10-2019, 01:52 PM   #8
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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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Old 09-10-2019, 03:41 PM   #9
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Greetings,
Mr. l. Check your ground connection and all connections, for that matter but check the ground first.
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Old 09-11-2019, 07:57 AM   #10
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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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Old 09-11-2019, 08:00 AM   #11
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Quote:
Originally Posted by RT Firefly View Post
Greetings,
Mr. l. Check your ground connection and all connections, for that matter but check the ground first.
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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Old Today, 05:48 PM   #12
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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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Old Today, 05:53 PM   #13
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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

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Old Today, 06:08 PM   #14
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First of all it is diesel, never heard of no blower
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Old Today, 06:15 PM   #15
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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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Old Today, 06:18 PM   #16
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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.
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Old Today, 07:32 PM   #17
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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.
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