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Gauges...Errrrr!

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Old Dec 31, 2015 | 07:56 PM
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Gauges...Errrrr!

Fuel and temp gauges not working. I installed a new coolant temp sensor, gauge doesn't work. Replaced the connector into the coolant temp sensor, gauge still doesn't work. When I unplug the connector from the temp sensor the check engine light comes on, CE light goes away when reconnected. Fuel gauge not working either. What should I check? Are these gauges wired together somewhere? When I turn my heater on high I get a big voltage drop. Not sure if that's related, just throwing it out there. It's a 89 f150 straight 6 auto. (Just incase u didn't see it in my profile name)
 
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Old Dec 31, 2015 | 08:23 PM
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The connector your pulling for the TEMP gauge in the dash isn't the correct one. Your pulling the ECT sensor connector.

The temperature Sender for the 300 is in the back, passenger side, way back, with only 1 wire.

The BIG voltage drop you get with the heater on high is because of the crappy 2G alternator Ford designed. Also, the fan is old and may have some high resistance.
 
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Old Dec 31, 2015 | 08:58 PM
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Originally Posted by timbersteel
The connector your pulling for the TEMP gauge in the dash isn't the correct one. Your pulling the ECT sensor connector.

The temperature Sender for the 300 is in the back, passenger side, way back, with only 1 wire.

The BIG voltage drop you get with the heater on high is because of the crappy 2G alternator Ford designed. Also, the fan is old and may have some high resistance.
Thanks. What does one you're talking about look like? What is it connected to? One wire color?
 
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Old Jan 1, 2016 | 09:01 AM
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Sounds like it could be a bad ground to the instruments as far as the gauges go. And your blower motor may be on it's way out.
 
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Old Jan 1, 2016 | 12:31 PM
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Ever consider a failed ICVR?
 
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Old Jan 1, 2016 | 05:10 PM
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Originally Posted by ArdWrknTrk
Ever consider a failed ICVR?
Wouldn't the icvr affect all of the gauges? All my others work
 
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Old Jan 1, 2016 | 05:24 PM
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An ICVR is used in the oil pressure, fuel level and water temperature gauges (explicitly not an ammeter/voltmeter).
 
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Old Jan 1, 2016 | 05:25 PM
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What other gauges?
The voltmeter?
The tach and speedo?

No
 
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Old Jan 1, 2016 | 05:27 PM
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Chris beat me to it...
 
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Old Jan 1, 2016 | 05:35 PM
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Originally Posted by ArdWrknTrk
Chris beat me to it...
The RPM gauge?
 
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Old Jan 1, 2016 | 06:11 PM
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Originally Posted by ctubutis
An ICVR is used in the oil pressure, fuel level and water temperature gauges (explicitly not an ammeter/voltmeter).
The oil pressure gauge works.
 
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Old Jan 1, 2016 | 06:26 PM
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If you've got two bad gauges I'd be looking at the cluster rather than the senders.

Ground the temp sender wire and see what It does.
 
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Old Jan 1, 2016 | 06:55 PM
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Also make sure that the harness plugs are plugged in tight on the rear of the cluster. They may appear to be but unless they snap in tight , it can do some weird stuff.
 
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Old Jan 1, 2016 | 06:55 PM
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I agree with Jim, ground/unground each sender's wire (with the ignition on) and see how the gauges react, they should swing fully from one direction to the other as they are grounded/ungrounded.

But like was explained above, the sending units for the dash gauges have just one wire each, never do this with any multi-conductor connector anywhere.
 
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Old Jan 1, 2016 | 06:55 PM
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Originally Posted by ArdWrknTrk
If you've got two bad gauges I'd be looking at the cluster rather than yhe senders.

Ground the temp sender wire and see what It does.
The one from the way back of the engine? Where is it exactly? What does it look like?
 
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