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Sounds like a week battery
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Bri892001 View Drop Down
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Points: 4947 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: August-19-2011 at 4:42pm
Here's my Post with Pics on adding a new dash ground.

Some have suggested running duplex (positive and negative double) wire in order to ad a new positive at the same time. The ground alone helped things a lot and is the simpler as far as wiring logic.

I think I'll be getting in there again and adding a positive feed as well though.
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8122pbrainard View Drop Down
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Originally posted by Jllogan Jllogan wrote:

jumpy guages indicate bad grounds.

Not really. The ground on a gauge is only there for the internal lighting. The ground is at the senders. Maybe you were cleaning up the + (hot) connections. Yes, that will do it.


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77 Tique

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Bri892001 View Drop Down
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Ok, Pete, I've been trying to get to the bottom of this one for a little while.

So, in essence, is temp gauge basically just an Ohm meter and the temp sensor is just a variable resister?

The positive feeds both the lighting, and the circuit that allows the sensor to work? A week positive would also cause bad gauge readings?
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Jllogan View Drop Down
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Originally posted by 8122pbrainard 8122pbrainard wrote:

Originally posted by Jllogan Jllogan wrote:

jumpy guages indicate bad grounds.

Not really. The ground on a gauge is only there for the internal lighting. The ground is at the senders. Maybe you were cleaning up the + (hot) connections. Yes, that will do it.


I guess I was saying a bad ground somewhere in the chain, not necessarily on the back of the guage. I didnt mess with those, but I did clean up the terminal strips.
1986 Ski Nautique 2001



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Jllogan View Drop Down
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Points: 1728 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jllogan Quote  Post ReplyReply Direct Link To This Post Posted: August-19-2011 at 5:05pm
Originally posted by Jllogan Jllogan wrote:

Originally posted by 8122pbrainard 8122pbrainard wrote:

Originally posted by Jllogan Jllogan wrote:

jumpy guages indicate bad grounds.

Not really. The ground on a gauge is only there for the internal lighting. The ground is at the senders. Maybe you were cleaning up the + (hot) connections. Yes, that will do it.


I guess I was saying a bad ground somewhere in the chain, not necessarily on the back of the guage. I didnt mess with those, but I did clean up the terminal strips.


Also I spelled "Gauge" wrong so thats two mistakes.
1986 Ski Nautique 2001



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8122pbrainard View Drop Down
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Originally posted by Bri892001 Bri892001 wrote:


So, in essence, is temp gauge basically just an Ohm meter and the temp sensor is just a variable resister?

The positive feeds both the lighting, and the circuit that allows the sensor to work? A week positive would also cause bad gauge readings?

Brian, Yes, yes and yes!

Justin,
the only sender that could have a bad ground is the fuel gauge sender. It would be bad from the engine to the tank.

Both the oil pressure sender and the temperature sender are screwed directly to the engine block. That is the ground!!


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Jllogan View Drop Down
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Originally posted by 8122pbrainard 8122pbrainard wrote:

Originally posted by Bri892001 Bri892001 wrote:


So, in essence, is temp gauge basically just an Ohm meter and the temp sensor is just a variable resister?

The positive feeds both the lighting, and the circuit that allows the sensor to work? A week positive would also cause bad gauge readings?

Brian, Yes, yes and yes!

Justin,
the only sender that could have a bad ground is the fuel gauge sender. It would be bad from the engine to the tank.

Both the oil pressure sender and the temperature sender are screwed directly to the engine block. That is the ground!!


What about the voltmeter?
1986 Ski Nautique 2001



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Bri892001 View Drop Down
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>>>>>>

Ok, now I get it. Thanks Pete.
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8122pbrainard View Drop Down
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Originally posted by Jllogan Jllogan wrote:

Originally posted by 8122pbrainard 8122pbrainard wrote:

Originally posted by Bri892001 Bri892001 wrote:


So, in essence, is temp gauge basically just an Ohm meter and the temp sensor is just a variable resister?

The positive feeds both the lighting, and the circuit that allows the sensor to work? A week positive would also cause bad gauge readings?

Brian, Yes, yes and yes!

Justin,
the only sender that could have a bad ground is the fuel gauge sender. It would be bad from the engine to the tank.

Both the oil pressure sender and the temperature sender are screwed directly to the engine block. That is the ground!!


What about the voltmeter?

Justin,
You're correct on the volt meter. It's the only one that has a ground source under the dash. Well, the hour meter does too but it won't bounce around it's needle!!


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Jllogan View Drop Down
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Points: 1728 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jllogan Quote  Post ReplyReply Direct Link To This Post Posted: August-19-2011 at 7:09pm
Originally posted by 8122pbrainard 8122pbrainard wrote:

Originally posted by Jllogan Jllogan wrote:

Originally posted by 8122pbrainard 8122pbrainard wrote:

Originally posted by Bri892001 Bri892001 wrote:


So, in essence, is temp gauge basically just an Ohm meter and the temp sensor is just a variable resister?

The positive feeds both the lighting, and the circuit that allows the sensor to work? A week positive would also cause bad gauge readings?

Brian, Yes, yes and yes!

Justin,
the only sender that could have a bad ground is the fuel gauge sender. It would be bad from the engine to the tank.

Both the oil pressure sender and the temperature sender are screwed directly to the engine block. That is the ground!!


What about the voltmeter?

Justin,
You're correct on the volt meter. It's the only one that has a ground source under the dash. Well, the hour meter does too but it won't bounce around it's needle!!


YES!!! Got one right.
1986 Ski Nautique 2001



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8122pbrainard View Drop Down
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Points: 41045 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: August-19-2011 at 7:51pm
Originally posted by Jllogan Jllogan wrote:

Originally posted by 8122pbrainard 8122pbrainard wrote:

Originally posted by Jllogan Jllogan wrote:

Originally posted by 8122pbrainard 8122pbrainard wrote:

Originally posted by Bri892001 Bri892001 wrote:


So, in essence, is temp gauge basically just an Ohm meter and the temp sensor is just a variable resister?

The positive feeds both the lighting, and the circuit that allows the sensor to work? A week positive would also cause bad gauge readings?

Brian, Yes, yes and yes!

Justin,
the only sender that could have a bad ground is the fuel gauge sender. It would be bad from the engine to the tank.

Both the oil pressure sender and the temperature sender are screwed directly to the engine block. That is the ground!!


What about the voltmeter?

Justin,
You're correct on the volt meter. It's the only one that has a ground source under the dash. Well, the hour meter does too but it won't bounce around it's needle!!


YES!!! Got one right.

Now, if you go back to the late 70's, you'll find amp meters instead of volt meters. No ground on them. It was hot in with heavy gauge wire rated to the alternator output and hot out to everything else on the boat.


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77 Tique

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Keeganino View Drop Down
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Points: 2063 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Keeganino Quote  Post ReplyReply Direct Link To This Post Posted: August-19-2011 at 10:47pm
This has been a good read. This winter I want to re-wire everything. I have a bunch of "get it through the weekend" fixes under the dash, plus I want to fully understand it, which for me means that I need to actually do it. What is it that Lombardi said? "Pursue perfection and you may achieve excellence".
"working on these old boats may not be cost effective but as it shows its what it brings into your life that matters" -Roger

1973 Skier
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All,
It is fixed. Two days of work and it should have been a 5 minute fix. The ground terminal to the battery one of those that is pre-made was the problem. The connections were as clean as they could be. It was a last resort before taking it to a repair shop. I cut the pre-made connector off and stripped the ground wire back. Touched the copper to the battery and the boat fired. Thanks so much for the info everyone.
7golfman
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8122pbrainard View Drop Down
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I'm assuming this was on the main ground cable to the battery. Be careful of what type of repair cable end you use otherwise you'll end up with the same problem. There are some pretty decent ones that use a compression type end (just like a compression tube fitting) that goes around the complete cable and preferred. Then there's the repair ends that have a simple two bolt strap that clamps onto the cable. These do not last that long since they leave lots of the bare copper exposed. Dielectric grease helps big time.

A new ground cable and of a heavier gauge would be my suggestion.


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77 Tique

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