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  #1  
Old 06-11-2014, 09:04 AM
jmike jmike is offline
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Join Date: May 2014
Boat: 1994 Mastercraft Pro Star 205
Location: New England
Posts: 5
Temp gauge not working - 94 PS205

My new to me 1994 PS205's temp gauge is not working. I really have no idea where to even start. Any suggestions on how to find and correct the issue the issue?

Appreciate any help you guys could offer.
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  #2  
Old 06-11-2014, 10:46 AM
SSMoose SSMoose is offline
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Join Date: Feb 2013
Boat: 1983 Stars and Stripes PowerSlot
Location: Southeast
Posts: 245
Check your sending unit. They fail more often than gauges.
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  #3  
Old 06-11-2014, 11:37 AM
Jeff d Jeff d is offline
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Join Date: May 2010
Boat: 2000 230 VRS
Location: Southeast
Posts: 1,286
With the key in the run position find the sender and disconnect the signal wire from it. Your gauge should go to zero (Or 80 or whatever the lowest value is) if it wasn't already there. Contact that sender wire to ground and your gauge should go to 250 (Or whatever the max is).

If the above checks out then your sender is bad. If your gauge doesn't move when the signal wire is grounded you've either got a wiring or a gauge issue.

Check continuity on the signal wire from the sender to the gauge by grounding one and and testing resistance to ground on the other end. It should be near 0 ohms.

Check that the gauge is receiving power and ground on the appropriate wires. There should be 4 wires to the gauge. Signal (From the sender), ignition switched power, ground, and Nav light switched power (For the backlight).
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  #4  
Old 06-12-2014, 09:35 AM
bochnak bochnak is offline
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Join Date: Sep 2013
Boat: 94' Prostar 205 - Indmar 5.7 TBI
Location: Mount Prospect,IL
Posts: 332
I just went through the same thing. First, the gauge was reading lower than normal. Next, the sender shorted out.

First do what Jeff d mentioned above.

Get a hold of a 100ohm resistor and ground the sending unit wire through this and it gauge should read 170.

You can also test your sender:
http://www.mastercraft.com/teamtalk/...3&postcount=12

Here is the replacement gauge I bought:
http://www.oempartsllc.com/gaugetele...w-1-1-1-1.aspx
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  #5  
Old 06-12-2014, 06:35 PM
jmike jmike is offline
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Join Date: May 2014
Boat: 1994 Mastercraft Pro Star 205
Location: New England
Posts: 5
Thanks everyone. The weather has been nasty the past couple days so I haven't had a chance to get out an work on it yet but I appreciate the help.
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  #6  
Old 07-12-2014, 09:15 PM
jmike jmike is offline
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Join Date: May 2014
Boat: 1994 Mastercraft Pro Star 205
Location: New England
Posts: 5
Thanks guys, turns out the previous owner removed the thermostat ... Put in a new one and temp gauge is working great now.
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gauge, temp, temperature, thermostat, thermostat location

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