Gauges shaking and not working

[James]

I've done a bunch of research today and messing with the wires underneath the dash trying to figure out what was wrong with my gauges in my 2000 Supra launch. When I turn the switch to the on position all my gauges wiggle a little bit and make noise then they just rest where they are. I have a medallion 1600 mdc and there's no water inside of it. Also the gauges worked when I bought the boat in October and since then I have only taken it out once (two weeks ago) and they worked sometimes and other times they didnt. But now they all just wiggle and don't work. Any suggestions?

[James]

Anyone? I wanna get this fixed this weekend if possible. Haha. Ready to get out on the water.

[CornRickey]

Try jumping one of the guage's ground lug to a known good ground and see if it changes anything. Sounds like a ground issue.

[James]

How would I go about doing this? Would I cut the wire harness ground really close to the gauge and put my good ground there and see if it works? Thanks

[CornRickey]

Go buy a pack of alligator clip leads and get up under the dash. The gauges have 3 or 4 threaded studs on the back that the ground, positive and signal leads connect to. The positive and grounds daisy chain from one to the other. I think mine started on the port gauge and went around to starboard. If I remember right the positives were purple and ground was black but double check. I'd run a lead from the negative terminal on the battery to the first guage and use systematic eliminatation. Or if you can find a good ground point under the dash use that.

[CornRickey]

I had a issue with my temp guage sporatically flickering. After doing everything under the dash I found the large round connection under the main breaker hae a bad contact. But with all of them doing that I think it sounds like a ground localized un der the dash.

[James]

Hey I followed the instructions for troubleshooting on this site and found out that I need a new computer.
http://www.bakesonline.com/images/MediaLibrary/MedallionII_Troubleshoot.pdf
Stinks this little thing cost so much. Anyone know anywhere else to get one cheaper?
http://i1251.photobucket.com/albums/hh556/jamespjackson95/0BADB323-43B3-44DC-A18F-55D05DBB1C83-8402-00000186660E0DDC.jpg

[James]

Am I safe to take it out tomorrow without my gauges working? It's going to take 3 weeks through bakes and my engine has always ran good no problems. Would y'all take it out?

[CornRickey]

No, doesn't the computer run the ignition also? Either way I'd pay for rush shipping instead of a new motor because that would be my luck

[James]

No it doesn't run the ignition in my boat but it might in newer models. But your right. It just stinks when it's over 80 and I want to go to the lake and I can't. Wish I would have know about this problem a few months ago haha.

[James]

We'll I am kind of bummed right now. I paid $415 bucks for a new computer and have waited to use the boat and I just hooked everything back up and the problem still continuous as before. Any suggestions? Please

[James]

Here's an example of what I am talking about.
http://i1251.photobucket.com/albums/hh556/jamespjackson95/D2BFE105-05AF-4786-BFF2-10D75FEB0B93-3264-000000C9AA7D6EB4.mp4

[Salty87]

do the needles normally peg to the right with the ignition off?

[James]

No. I don't think they should. Don't they usually peg to the left?