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Gauges jump when I turn on the Nav lights

Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=39265
Printed Date: November-16-2024 at 4:53pm


Topic: Gauges jump when I turn on the Nav lights
Posted By: karthur
Subject: Gauges jump when I turn on the Nav lights
Date Posted: July-09-2016 at 8:07pm
I have noticed that when I turn on my nav lights... the ALT, Oil pressure and fuel gauge hands will all jump around like they have been shook real hard. They settle back down (on a reading higher than "normal"). Take for instance the oil pressure gauge... with the NAV lights off, it will read 40 psi... with them on, it will read like 50psi.

Is this a normal thing? I assume it is, I have just always wondered about it.

My boat is a 1987 SN.

Thanks


Replies:
Posted By: MechGaT
Date Posted: July-09-2016 at 9:39pm
The ground on these boats are notoriously weak. It is daisy chained from one thing to the next. There is a thread on here about wiring a better ground and power source. Read that one & what you are seeing will sound familiar.

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'92 Sport Nautique

Posted By: karthur
Date Posted: July-10-2016 at 2:02am
Is this the thread you are talking about?
%20" rel="nofollow - http://www.correctcraftfan.com/forum/forum_posts.asp?TID=21901&PN=2&title=added-new-dash-ground-to-93-with-pics

Posted By: Dreaming
Date Posted: July-10-2016 at 3:48am
Originally posted by karthur karthur wrote:

Is this the thread you are talking about?
%20" rel="nofollow - http://www.correctcraftfan.com/forum/forum_posts.asp?TID=21901&PN=2&title=added-new-dash-ground-to-93-with-pics


yep, that's the one.   I would suggest that if you haven't replaced the battery wire, that may be part of your issue as well.    use your VOM and check for a large resistance in the wire to tell you if it's not doing it's job anymore.


Posted By: Morfoot
Date Posted: July-10-2016 at 11:28am
Yep......nature of the beast on these boats. Winter project for sure. been on my list of things to do for about 5 years now.

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"Morfoot; He can ski. He can wakeboard.He can cook chicken.He can create his own self-named beverage, & can also apparently fly. A man of many talents."72 Mustang "Kermit",88 SN Miss Scarlett, 99 SN "Sherman"

Posted By: 8122pbrainard
Date Posted: July-10-2016 at 11:47am
Originally posted by Morfoot Morfoot wrote:

. Winter project for sure. been on my list of things to do for about 5 years now.

Tim,
You'll never get it done since you only get snow and or ice down there every 4 years or so and then it only lasts for a couple days!!

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/diaries/details.asp?ID=1622" rel="nofollow -

54 Atom

/diaries/details.asp?ID=2179" rel="nofollow - 77 Tique

64 X55 Dunphy

Keep it original, Pete
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Posted By: karthur
Date Posted: July-10-2016 at 5:21pm
Originally posted by Dreaming Dreaming wrote:

Originally posted by karthur karthur wrote:

Is this the thread you are talking about?
%20" rel="nofollow - http://www.correctcraftfan.com/forum/forum_posts.asp?TID=21901&PN=2&title=added-new-dash-ground-to-93-with-pics


yep, that's the one.   I would suggest that if you haven't replaced the battery wire, that may be part of your issue as well.    use your VOM and check for a large resistance in the wire to tell you if it's not doing it's job anymore.


"....battery wire".....I found this wiring diagram for the 1987.

http://www.correctcraftfan.com/downloads/1987_dash.pdf" rel="nofollow - http://www.correctcraftfan.com/downloads/1987_dash.pdf

Is the battery wire here shown here? Or are you talking about the large battery cable coming from the positive battery terminal?

Thanks


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