Go Back   TeamTalk > Maintenance Tips, How-tos and Refurbishing Topics > Electrical

Reply
 
Thread Tools Display Modes
  #1  
Old 07-19-2017, 12:45 PM
Crashmasterb Crashmasterb is offline
TT Newbie
 
Join Date: Jul 2017
Boat: 1990 mastercraft prostar 190
Location: Midwest
Posts: 9
Voltage spikes

I'm new to the forum and looking for some advice. I have a 1990 prostar 190 with the gt40 351. The other day on the lake I had an issue with the engine intermittently cutting out and every gauge on the dash had the needles going crazy. They would all spike in both directions really fast. Then suddenly everything went back to normal. Did this a few times that day. Tried wiggling every wire I could get my hands on while it was happening with no changes. Alternator seems to be putting out about 14.5 volts on my fluke volunteer. Batteries are both brand new. Anyone else ever had a similar problem? Thanks.
Reply With Quote
  #2  
Old 07-19-2017, 03:48 PM
WA Nautique WA Nautique is offline
TT Regular
 
Join Date: Sep 2013
Boat: 94 Ski Nautique
Location: Northwest
Posts: 54
time to go through your ground wires and clean up the terminals. I bet something is making poor contact.
Reply With Quote
  #3  
Old 07-19-2017, 06:02 PM
thatsmrmastercraft's Avatar
thatsmrmastercraft thatsmrmastercraft is offline
MC Master Poster
 
Join Date: Sep 2008
Boat: 1977 Stars & Stripes
Location: St. Paul, MN
Posts: 18,401
Quote:
Originally Posted by WA Nautique View Post
time to go through your ground wires and clean up the terminals. I bet something is making poor contact.
Agreed. This could be anywhere from the dash ground to the battery ground at the block.
__________________
CUSTOM WHEEL & TIRE PACKAGES

$125 LED LIGHT PACKAGE - FREE SHIPPING
REBUILDING HOLLEY MARINE CARBS - $249 DELIVERED
REBUILT COMPLETE MARINE HOLLEY 4160 CARBS
FOR 302, 351 & 454 STARTING AT $425 DELIVERED
Email - tiresplease@gmail.com
Reply With Quote
  #4  
Old 07-21-2017, 11:59 AM
curver900 curver900 is offline
MC Devotee
 
Join Date: Aug 2013
Boat: Mastercraft, prostar 2001 205v
Location: midwest
Posts: 2,050
if that all checks out.. how old are the battery cables themselves??? might be at the end of their useful life or beyond...
Reply With Quote
  #5  
Old 08-01-2017, 09:40 AM
Crashmasterb Crashmasterb is offline
TT Newbie
 
Join Date: Jul 2017
Boat: 1990 mastercraft prostar 190
Location: Midwest
Posts: 9
Just did dual battery install over the winter. 2 brand new batteries and all brand new cables. Any idea where the dash ground is located?
Reply With Quote
  #6  
Old 08-09-2017, 04:08 PM
Crashmasterb Crashmasterb is offline
TT Newbie
 
Join Date: Jul 2017
Boat: 1990 mastercraft prostar 190
Location: Midwest
Posts: 9
So it turns out it was the alternator. It finally quit charging all together. Replaced it with a 105 amp unit and all is well.
Reply With Quote
  #7  
Old 08-09-2017, 05:09 PM
88 PS190 88 PS190 is offline
MC Maniac
 
Join Date: Aug 2005
Boat: 1988 MC Prostar 190, 351 Ford
Location: Midwest
Posts: 3,853
Send a message via AIM to 88 PS190
[quote=Crashmasterb;1362621]Just did dual battery install over the winter. 2 brand new batteries and all brand new cables. Any idea where the dash ground is located?[/QUOTE}

Glad the alternator solved it - for reference there's just a black wire that runs to most of the gauges. If you're having odd wiring voodoo - or odd performance issues with the dash/gauges or particularly perfect pass module it can be good to run a separate good ground from the battery up into the dash (or your dual battery switch) - the factory scheme is to ground the block to the battery, then they have a ground wire from the gauges back to the block which is where problems arise if there are corrosion or bad crimps in those wires.

For my perfect pass a winter project is going to be running a dedicated power through a switched relay run off the aux switch - to even further isolate the electronics.
Reply With Quote
  #8  
Old 08-09-2017, 05:53 PM
Crashmasterb Crashmasterb is offline
TT Newbie
 
Join Date: Jul 2017
Boat: 1990 mastercraft prostar 190
Location: Midwest
Posts: 9
Over the winter when I did the dual battery install I also did a 1200 watt stereo install. Guessing that's what killed the alternator.
Reply With Quote
  #9  
Old 08-09-2017, 08:50 PM
CruisinGA's Avatar
CruisinGA CruisinGA is offline
MC Devotee
 
Join Date: Jun 2009
Boat: '01 X9 330HP
Location: Georgia
Posts: 2,258
Quote:
Originally Posted by Crashmasterb View Post
Over the winter when I did the dual battery install I also did a 1200 watt stereo install. Guessing that's what killed the alternator.
Could be. Alternator brushes also wear and eventually get too short.

Did you replace with marine alternator? They are different and it's a major safety hazard to use an automotive alternator FYI
__________________
Bailey
'02 X-9
Lake Blue Ridge
Reply With Quote
  #10  
Old 08-31-2017, 10:52 AM
Crashmasterb Crashmasterb is offline
TT Newbie
 
Join Date: Jul 2017
Boat: 1990 mastercraft prostar 190
Location: Midwest
Posts: 9
Ya. 105 amp marine alternator from db electric.
Reply With Quote
Reply

Thread Tools
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


All times are GMT -4. The time now is 07:34 PM.