Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-26-2019, 01:21 PM   #1
Ensign
 
Join Date: Jun 2019
Location: PA
Posts: 7
Default Merc 3.0 Engine/Electrial shut down while running

Good Morning all, So I posted a thread a few weeks back a had a bunch of issues taken care of on my 02 1800SR 3.0. Thanks for everyone's input by the way. I had to drain my tank/ rebuild the carb because of a water issue. Also replaced my starter and fuel pump as it was frozen in ice over the winter.

So all this fixed its starts up idles and runs fine, so this is great. BUT.... for some reason while I'm running I completely lose power and it kills my engine. Sometimes I can run it 10-15 min straight with no issue and sometimes I take it a hundred yards and it cuts out. I believe its electrical because all of my gauges and blower shut off too. What boggles my mind more is when it shuts down sometimes my power comes back literally within a couple seconds and I can fire it back up and start going again... . my temp seems to be fine on my gauges. I checked the normal wiring making sure things were tight and clean of any corrosion.

has anyone had an similar issues? thoughts?
__________________

rkr0017 is offline   Reply With Quote
Old 07-26-2019, 04:49 PM   #2
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 7,788
Default

Since you are loosing the blower in addition to the engine this eliminates the engine wiring. When checking the battery wiring did you also inspect the negative wires including the one that connect to the rear of the engine? Did you remove them clean with an electrical contact cleaner then reinstall? One last thing is the battery switch may have flaky contacts. Do you have one that has Batt1 and Batt2 positions and if so does the issue happen in either position?
__________________

__________________
1997 2400 SCR
5.7 Vortec / Bravo 2
Mike
mmwjr is offline   Reply With Quote
Old 07-26-2019, 05:13 PM   #3
Ensign
 
Join Date: Jun 2019
Location: PA
Posts: 7
Default

Thanks Mike, The connections I checked, took off and used some sandpaper and reapplied them. I thought that would do the trick but no luck. I didn't mess with my battery switch yet. I have one of those turn key switches, maybe I should replace it? they are about $7 on amazon. I attached a pic below of the one I have.


rkr0017 is offline   Reply With Quote
Old 07-26-2019, 07:11 PM   #4
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 7,788
Default

Iíve heard lots of complaints about that key style, I would replace it with a quality switch from Blue Seas.
__________________
1997 2400 SCR
5.7 Vortec / Bravo 2
Mike
mmwjr is offline   Reply With Quote
Old 07-27-2019, 08:56 PM   #5
Admiral
 
Phillbo's Avatar
 
Join Date: Mar 2012
Location: Lake Powell
Posts: 1,285
Default

Losing power from the batteries should not kill the engine. It should run off the alternator.
Phillbo is offline   Reply With Quote
Old 07-27-2019, 10:05 PM   #6
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 7,788
Default

Quote:
Originally Posted by Phillbo View Post
Losing power from the batteries should not kill the engine. It should run off the alternator.
You are correct, my bad.

This takes us back to a bad negative connection.
__________________
1997 2400 SCR
5.7 Vortec / Bravo 2
Mike
mmwjr is offline   Reply With Quote
Old 07-31-2019, 11:42 AM   #7
Ensign
 
Join Date: Jun 2019
Location: PA
Posts: 7
Default

I did cut the power to the battery to try that. It runs off the alternator but it doesn't sound great. Whines pretty good. Any chance that could be starting to fail causing a momentary loss in power?
rkr0017 is offline   Reply With Quote
Old 07-31-2019, 05:10 PM   #8
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 7,788
Default

What is making the noise; the engine, alternator, ...? What voltage is the alternator putting out under this condition?
__________________
1997 2400 SCR
5.7 Vortec / Bravo 2
Mike
mmwjr is offline   Reply With Quote
Old 07-31-2019, 05:43 PM   #9
Ensign
 
Join Date: Jun 2019
Location: PA
Posts: 7
Default

seems like the alternator is making the sound. Not sure of the voltage but I will check that.
__________________

rkr0017 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


Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 02:38 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, vBulletin Solutions, Inc.