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Gauges jump when I turn on the Nav lights
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karthur View Drop Down
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    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
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MechGaT View Drop Down
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Points: 271 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MechGaT Quote  Post ReplyReply Direct Link To This Post 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.
'92 Sport Nautique
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karthur View Drop Down
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Is this the thread you are talking about?
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=21901&PN=2&title=added-new-dash-ground-to-93-with-pics
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Dreaming View Drop Down
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Points: 1870 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dreaming Quote  Post ReplyReply Direct Link To This Post Posted: July-10-2016 at 3:48am
Originally posted by karthur karthur wrote:

Is this the thread you are talking about?
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.

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Morfoot View Drop Down
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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.
"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"
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8122pbrainard View Drop Down
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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!!


54 Atom

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Keep it original, Pete
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karthur View Drop Down
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Originally posted by Dreaming Dreaming wrote:

Originally posted by karthur karthur wrote:

Is this the thread you are talking about?
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

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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