Reply
 
Thread Tools Search this Thread Display Modes
 
Old 04-02-2020, 08:45 AM   #1
Member
 
City: Harwich
Vessel Name: Sinbad
Vessel Model: NT37
Join Date: Apr 2018
Posts: 14
NT37 - Engine starting glitch

Greetings from the UK, hope you are all managing to keep well in these torrid times.

Please see a couple of photos of the 12V DC panel on my Nordic Tug 37, the 2 readings are the amps being drawn, one with the Battery switch off (0.4amps) and the second showing 10.3. The 10.3 amp picture was taken just before it trips out as the switch is only rated at 5 amp.

So my learned friends what is causing the amps to surge? Engine start has been working faultlessly until this problem and no other electrical works have taken place.

Thanks and stay safe

Click image for larger version

Name:	IMG_0052 (1).jpg
Views:	31
Size:	99.3 KB
ID:	101022

Click image for larger version

Name:	IMG_0053 (1).jpg
Views:	35
Size:	126.4 KB
ID:	101023
__________________
Advertisement

steved59 is offline   Reply With Quote
Old 04-02-2020, 09:34 AM   #2
Senior Member
 
Tator's Avatar
 
City: Bainbridge Island/Petersburg Alaska
Vessel Name: Oz
Vessel Model: Bluewater 40' RPH 1979
Join Date: Feb 2015
Posts: 352
I'm confused. What exactly does the battery 1 switch power? Is it some type of solenoid or relay that in turn powers the engine start battery? 5 amps is way too low for an engine starter.

Tator
__________________

Tator is offline   Reply With Quote
Old 04-02-2020, 09:49 AM   #3
Member
 
City: Harwich
Vessel Name: Sinbad
Vessel Model: NT37
Join Date: Apr 2018
Posts: 14
Hi Tator

The Engine 1 switch goes to a solenoid, please see some other pics of the set up.

Thanks
Click image for larger version

Name:	IMG_0054.jpg
Views:	27
Size:	93.3 KB
ID:	101027

Click image for larger version

Name:	IMG_0055.jpg
Views:	34
Size:	74.9 KB
ID:	101028

Click image for larger version

Name:	IMG_0056.jpg
Views:	31
Size:	106.6 KB
ID:	101029
steved59 is offline   Reply With Quote
Old 04-02-2020, 10:21 AM   #4
DDW
Guru
 
City: San Francisco
Join Date: Apr 2018
Posts: 1,671
It seems like the coil in the solenoid has shorted. Or something else unknown is on the same breaker. I'd disconnect the control line from the solenoid (documentation here) and see if you can turn on the breaker without it tripping. It is only supposed to draw a few amps, even on inrush. That is an obsolete part, but Blue Sea (generally very good equipment) has suitable replacements.

Is the starter current going through that solenoid? Engine won't start unless it is energized?
DDW is offline   Reply With Quote
Old 04-02-2020, 10:37 AM   #5
Member
 
City: Harwich
Vessel Name: Sinbad
Vessel Model: NT37
Join Date: Apr 2018
Posts: 14
Thanks for the reply.

If I forcibly hold the Battery 1 switch on the engine will start with no problem, the switch will then trip again with the engine running...

Thanks
steved59 is offline   Reply With Quote
Old 04-02-2020, 10:45 AM   #6
Guru
 
boathealer's Avatar
 
City: Out Cruisin'
Vessel Name: SCOUT
Vessel Model: Great Harbour N37
Join Date: Aug 2017
Posts: 1,335
I've had the breakers (sensing part) go bad before, but your meter shows the actual amps through the shunt (actual likely reduced by resistance of light 5A wiring), so that is not it.

*I* wouldn't HOLD the breaker to make it work. Probably pulling more current through it (and the sensing part) than it is rated for. May be damaging (at least) the sensor/trip part.

You likely have a load (solenoid) or wire problem. Find that and fix it. Start by disconnecting the solenoid and make sure the current goes to zero.
__________________
--
Ray
m/v SCOUT Web Site
m/v SCOUT Projects Page
boathealer is offline   Reply With Quote
Old 04-02-2020, 11:35 AM   #7
Guru
 
KnotYet's Avatar
 
City: Los Angeles
Join Date: Feb 2020
Posts: 636
There may be a connection that is allowing the voltage to drop below the threshold
for the accurate function of your ammeter. Or, the starter may be drawing too much.
The breaker may also be tired and need replacing. They do wear out.
KnotYet is offline   Reply With Quote
Old 04-02-2020, 04:59 PM   #8
Senior Member
 
Stout's Avatar
 
City: Lake Oswego, Oregon
Vessel Name: Stout
Vessel Model: Nordic Tug 42
Join Date: Dec 2013
Posts: 142
ACR failure

Our 2008 NT-42 had that ACR and it failed. I replaced it recently with a Blue Seas ML-7266 ACR. This unit replaced the one that failed that is no longer available. There is a bit of re-wiring for the parallel control switch at the dash board.
__________________
Cheers, Kevin
Stout is offline   Reply With Quote
Old 04-11-2020, 10:48 AM   #9
Member
 
City: Harwich
Vessel Name: Sinbad
Vessel Model: NT37
Join Date: Apr 2018
Posts: 14
New solenoid switch fitted, now all working OK, bit of a heat mark from where the old solenoid was fitted, and there was a hairline crack on the back of the unit.

Click image for larger version

Name:	IMG_0060 (1).jpg
Views:	24
Size:	101.2 KB
ID:	101341Unfortunately lock down here means no leisure boating at all, and its a beautiful light wind Easter weekend, stay safe everybody.
steved59 is offline   Reply With Quote
Old 04-12-2020, 07:58 AM   #10
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 21,959
A quality rotary switch may require more effort than a solenoid to operate , but many last the life of the boat.
FF is offline   Reply With Quote
Old 04-12-2020, 12:24 PM   #11
Member
 
City: Harwich
Vessel Name: Sinbad
Vessel Model: NT37
Join Date: Apr 2018
Posts: 14
I couldn't agree more to the tried and trusted rotary switch for battery banks, all my previous boats have had them.

But as this appears to be a standard fit for Nordic Tug I decided to fit like for like, however, I do have a question regarding this switched solenoid set up.

The on/off switch for the solenoid on the DC panel has one of those protective covers that prevents accidental turning off as you would expect for bilge pumps etc. See picture in my first post.

Should this switch be left permanently on, or only turned on when using the boat?. I believe the previous owner left it on all the time, but the solenoid failure (after 11 years of use) got me thinking that I should turn it off after shutting down the engine. Thoughts?

Thanks
steved59 is offline   Reply With Quote
Old 04-12-2020, 12:31 PM   #12
Guru
 
KnotYet's Avatar
 
City: Los Angeles
Join Date: Feb 2020
Posts: 636
The main battery switch was always 'off' when I left the boat for any length of time.
Bilge pumps were on a separate circuit and the battery chargers were left 'on' on the AC panel.
KnotYet is offline   Reply With Quote
Old 04-14-2020, 02:06 PM   #13
Guru
 
C lectric's Avatar
 
City: Gibsons, B.C., Canada
Vessel Name: Island Pride
Vessel Model: Palmer 32'
Join Date: Oct 2007
Posts: 3,455
Personally , it depends upon how the charging system is setup and the battery type.

If you have a multi output 120V charger and both battery banks are charged from it when plugged in then the ACR could be turned off. THe charger will recharge both banks and the ACR is not needed..

If you have two different types of batteries and one charger for each bank set for those batteries then the ACR is not needed.

When you are running the boat and the alternator is intended to recharge
both battery banks then the ACR is needed.

That's what I do with mine.
__________________

C lectric is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 02:50 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×