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eratic Tach and volt meter

Discussion of batteries, chargers, wiring, generators, distribution panels, battery switches, etc.
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Topic author
nolacarver
Scurvy Dog
Scurvy Dog
Posts: 19
Joined: October 6th, 2013, 6:49 pm
Vessel Info: 1979 33' carver
New Orleans, LA

eratic Tach and volt meter

Postby nolacarver » March 22nd, 2015, 6:26 pm

My tachometer and volt meter is consistently chattering in sync very erratically. any suggestions of a possible culprit ?
Thanks for any help! :help:

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United States of America
waybomb
CYO Moderator
CYO Moderator
Posts: 1967
Joined: February 5th, 2013, 9:24 pm
Vessel Info: 1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glaspar / 1969 Johnson Electrmatic 85
1964 Barron Flat bottom drag boat
A couple of dinghies
Location: Saint Joseph and Trenton, MI
Has thanked: 41 times
Been thanked: 283 times

Re: eratic Tach and volt meter

Postby waybomb » March 22nd, 2015, 8:16 pm

One of the diodes bad in the alternator? That will cause pulses.
Thanks
Fred
1964 Barron Flatbottom with BBC Chevy
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572s
http://s4.beta.photobucket.com/user/waybomb/library/
Past - 1988 2807, 1989 4207 Aft
User avatar

Topic author
nolacarver
Scurvy Dog
Scurvy Dog
Posts: 19
Joined: October 6th, 2013, 6:49 pm
Vessel Info: 1979 33' carver
New Orleans, LA

Re: eratic Tach and volt meter

Postby nolacarver » March 23rd, 2015, 10:49 am

It is a new alternator but I guess that explains why the battery on that engine went dead after cruising. The amp meter is at 13 amps while running and chattering.is it possible to not charge battery even though it shows 13 amps?
User avatar

United States of America
waybomb
CYO Moderator
CYO Moderator
Posts: 1967
Joined: February 5th, 2013, 9:24 pm
Vessel Info: 1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glaspar / 1969 Johnson Electrmatic 85
1964 Barron Flat bottom drag boat
A couple of dinghies
Location: Saint Joseph and Trenton, MI
Has thanked: 41 times
Been thanked: 283 times

Re: eratic Tach and volt meter

Postby waybomb » March 23rd, 2015, 11:36 am

If your shop does not have an alternator tester pull it out and bring it to a place like autozone. They have a rig that can fully test the alternator.
Thanks
Fred
1964 Barron Flatbottom with BBC Chevy
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572s
http://s4.beta.photobucket.com/user/waybomb/library/
Past - 1988 2807, 1989 4207 Aft

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