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09-03-2013, 04:43 PM
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#1
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Senior Member
City: Foley, Alabama
Vessel Name: GITANA
Vessel Model: Sea Ranger 47 Pilothouse
Join Date: Mar 2012
Posts: 315
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Water Temp Gauge Replacement
My 1978 Marine Trader Trawler with twin Lehman 120's needs new water temperature gauges. Only one of the original four is still working. Anybody know where I can find replacements for the original "AC" units (fit 52mm hole, bezel size about 58mm)? If not, any suggestions on suitable alternative replacements? Thanks.
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09-05-2013, 06:45 AM
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#2
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Guru
Join Date: Oct 2007
Posts: 22,553
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My recommendation is always to install Murphy Gauges.
They have an adjustable alarm function and are mechanical, so will operate at all times.
If other folks take the helm at times having an alarm for as many functions as can be done is a great safety insurance policy.
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09-05-2013, 06:52 AM
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#3
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Guru
Join Date: Jun 2008
Posts: 5,036
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I replaced my gages and sender with VDO. They are very accurate when compared to readings on an IR gun. I bought them via egauges.com
__________________
Jay Leonard
Ex boats: 1983 40 Albin trunk cabin, 1978 Mainship 34 Model 1
New Port Richey, Fl
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09-05-2013, 07:38 AM
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#4
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Senior Member
City: Foley, Alabama
Vessel Name: GITANA
Vessel Model: Sea Ranger 47 Pilothouse
Join Date: Mar 2012
Posts: 315
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Thanks gents. I think I've found what I need. Called American Diesel. They're shipping new gauges and senders. I appreciate your help!
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09-05-2013, 12:00 PM
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#5
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Guru
City: UMR MM283
Vessel Name: Northern Lights II
Vessel Model: Bayliner 3870
Join Date: Jan 2013
Posts: 1,357
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Quote:
Originally Posted by Captain K
Thanks gents. I think I've found what I need. Called American Diesel. They're shipping new gauges and senders. I appreciate your help!
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Did you test the circuits to determine where the problem is? With the key on if you ground the wire on the sender & the gauge pegs the gauge & wiring are good & the sender is the problem. If the gauge doesn't peg then the gauge or wiring is bad, to find which is bad ground the stud on the gauge that the sender wire attaches to if the gauge pegs the wiring is shorted, if it still fails to peg the gauge is bad. Good luck
__________________
Ron on Northern Lights II
I don't like making plans for the day because the word "premeditated" gets thrown around in the courtroom.
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09-05-2013, 12:11 PM
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#6
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Veteran Member
City: Florence
Vessel Name: Jubilee
Vessel Model: Prima Seahorse
Join Date: Apr 2013
Posts: 87
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Quote:
Originally Posted by River Cruiser
Did you test the circuits to determine where the problem is? With the key on if you ground the wire on the sender & the gauge pegs the gauge & wiring are good & the sender is the problem. If the gauge doesn't peg then the gauge or wiring is bad, to find which is bad ground the stud on the gauge that the sender wire attaches to if the gauge pegs the wiring is shorted, if it still fails to peg the gauge is bad. Good luck
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River Cruiser
Does this test method work with all mechanical gauges with sending unit ! Fuel, water, etc ?
Thanks.
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09-05-2013, 12:29 PM
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#7
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Enigma
City: Slicker?
Join Date: Oct 2007
Posts: 16,563
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Greetings,
I think this technique will work with all ELECTRICAL gauges except the tachometer.
__________________
RTF
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09-05-2013, 01:59 PM
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#8
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Guru
Join Date: Oct 2007
Posts: 22,553
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For a mechanical gauge just plunk the bulb in a pot of boiling water , should show 212F if you are at sea level.
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09-05-2013, 02:11 PM
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#9
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Senior Member
City: Foley, Alabama
Vessel Name: GITANA
Vessel Model: Sea Ranger 47 Pilothouse
Join Date: Mar 2012
Posts: 315
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Quote:
Originally Posted by River Cruiser
Did you test the circuits to determine where the problem is? With the key on if you ground the wire on the sender & the gauge pegs the gauge & wiring are good & the sender is the problem. If the gauge doesn't peg then the gauge or wiring is bad, to find which is bad ground the stud on the gauge that the sender wire attaches to if the gauge pegs the wiring is shorted, if it still fails to peg the gauge is bad. Good luck
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I'm afraid the answer is no. Wish I'd had your very valuable information before I ordered the new gauges and senders from American Diesels, but I suspect I'd have to order new stuff anyway. Here's why: I have two helm stations and two engines. The lower helm station water temp gauges have been inoperative since I bought the boat 3 years ago. Both the upper helm station's gauges worked A-OK. Then this past weekend, the port engine gauge at the upper helm failed, the needle pegged on the high side at 220-F. As a precaution I shut down the port engine until I could get back to my slip and trouble shoot the problem. Once home, I switched gauges at the upper helm. I discovered then that the port gauge worked fine, while the former port gauge (now on the starboard side) gave the same faulty indication before the switch. My conclusion, perhaps incorrect, is: (1) the senders must be good, otherwise the upper helm gauges would not have been working just fine until now, and (2) the wiring must be good for the same reason. I'd very much appreciate your thoughts and comments on the above.
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09-05-2013, 03:52 PM
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#10
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Enigma
City: Slicker?
Join Date: Oct 2007
Posts: 16,563
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Greetings,
As with anything, working fine up until now doesn't mean working in the next two minutes. ANY time I have an electrical problem the first thing I check is the wiring. Power source first then grounds. A VOM (can be had for $5) Digital Multimeter - 7 Function, w/ Backlight
Corroded connections or bad splices are common on a boat particularly if the PO was a "Rocket Scientist" or of the "out of sight-out of mind" school of maintenance.
You will still be further ahead by changing your gauges. Now you should have working gauges at BOTH helms and that's a good thing.
__________________
RTF
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09-05-2013, 04:31 PM
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#11
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Guru
City: UMR MM283
Vessel Name: Northern Lights II
Vessel Model: Bayliner 3870
Join Date: Jan 2013
Posts: 1,357
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Quote:
Originally Posted by Captain K
I'm afraid the answer is no. Wish I'd had your very valuable information before I ordered the new gauges and senders from American Diesels, but I suspect I'd have to order new stuff anyway. Here's why: I have two helm stations and two engines. The lower helm station water temp gauges have been inoperative since I bought the boat 3 years ago. Both the upper helm station's gauges worked A-OK. Then this past weekend, the port engine gauge at the upper helm failed, the needle pegged on the high side at 220-F. As a precaution I shut down the port engine until I could get back to my slip and trouble shoot the problem. Once home, I switched gauges at the upper helm. I discovered then that the port gauge worked fine, while the former port gauge (now on the starboard side) gave the same faulty indication before the switch. My conclusion, perhaps incorrect, is: (1) the senders must be good, otherwise the upper helm gauges would not have been working just fine until now, and (2) the wiring must be good for the same reason. I'd very much appreciate your thoughts and comments on the above.
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I would guess you are correct, switching the gauges seem to indicate that you are. Are your senders for duel station gauges? The reason I ask is that usually 1 sender will feed 2 gauges & if the lower helm temp gauges didn't work & the ones on the FB did then most likely the lower helm gauges or wiring is faulty. Many owners will think they're a genuine electrician & mess with 12v but would never do the same with AC, I've been helping on a boat that that has had to many owners like that & the DC circuits are a mess. If I ever buy another boat the 1st thing I'll check is the wiring if its been hacked on or there are any electrical gremlins in the systems I'll walk away right then.
__________________
Ron on Northern Lights II
I don't like making plans for the day because the word "premeditated" gets thrown around in the courtroom.
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09-05-2013, 07:56 PM
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#12
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Senior Member
City: Foley, Alabama
Vessel Name: GITANA
Vessel Model: Sea Ranger 47 Pilothouse
Join Date: Mar 2012
Posts: 315
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Quote:
Originally Posted by River Cruiser
I would guess you are correct, switching the gauges seem to indicate that you are. Are your senders for duel station gauges? The reason I ask is that usually 1 sender will feed 2 gauges & if the lower helm temp gauges didn't work & the ones on the FB did then most likely the lower helm gauges or wiring is faulty. Many owners will think they're a genuine electrician & mess with 12v but would never do the same with AC, I've been helping on a boat that that has had to many owners like that & the DC circuits are a mess. If I ever buy another boat the 1st thing I'll check is the wiring if its been hacked on or there are any electrical gremlins in the systems I'll walk away right then.
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Honestly, I do not know the answer to your question, but I assume the senders are for dual station gauges. Perhaps that ASSumption makes me an ASS? I concur with your resolution to check out the wiring in future!
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