Question about 1989 Chevrolet K1500

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No power turn key on but no power to the gauges, but power every else

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Check fuses

Posted on Nov 12, 2008

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Why does my temp gauge rise to hot when the van is off - but as soon as the key is switched on it goes back to the cold end of the temp gauge


The gauge is unpowered when you turn the key off, so the needle can go wherever it wants to. When you turn the key on, the gauge gets power and will show the actual engine coolant temperature.

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Bad ignition switch?


Sounds like a problem in the ignition switch. When the gauges do not come on, how about the warning lights and the check engine light? If they don't turn on also, it may be a problem between the switch and the portion of the instrument panel fuse block that the switch sends power to in run or start-and then on to the dash for the gauges and warning lights.
You could check for power on the gauges fuse with key on. With the key in on position, all fuses in the instrument panel should have power to them. Check the fuses for power when the gauges do not come on. If no power in run, either the switch is bad, or however the switch sends power to those fuses (the ones called "hot in run or start") is not working. On some, the ignition switch's run wire trips a relay which sends power to the fuse panel. You would have to see a wiring diagram to see your set up. But it sounds like the problem is the switch or the wiring after it, not an engine sensor problem.

To check if a fuse has power, use a test light. Find a good ground for the test light under the dash, turn key to on, and use the needle probe of tester to probe the little indents on each end of the top of the fuse-these are test ports to check for power. A good fuse will light the tester on both ends of the fuse. A bad fuse (blown) will only light the tester on one end of the fuse-the metal strip inside the fuse has blown. Just check if all your fuses have power on them with the key on. Check them when the gauges don't work. IF no power, switch is bad or it is not turning that portion of the fuse panel on for some reason.

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2 Answers

Nissan avenir dash lights


There is a fuse for the warning lights and gauges. Yes, you checked the fuses and relays, but you need to check if power is there at the fuse, with the key in the on position.

Here's how turning the key to on causes the warning lights and gauges to turn on: From your ignition switch the on or run wire out of it will have power with key on. The run wire will also send power to the part of the fuse panel that is of the category "hot in run or on", where your fuse for the dash warn. lts. & gauges is- it may be labeled "meter" or "gauges" or like that. From the fuse, a hot wire goes into the harness for the instrument cluster-for the warning lights and gauges. The wire, like the fuse, is only hot in on or run.

The ignition's run wire may splice with a direct connection to some fuses, or more likely there may be an "ignition relay" that powers the "hot in run or on" fuses, and the run wire is used to turn the relay on. You could look for this relay just above or around the fuse panel under the dash. But the easiest place to start is to see if the fuse for the gauges has power to it with the key in on. If it does, the problem is up further on at the cluster connection or a ground for the gauges and cluster. If the fuse has no power available, then the problem is between the ignition switch and the fuse panel. That could be a faulty ignition relay.

Jan 09, 2014 | Cars & Trucks

1 Answer

Dashboard gauges turn off and on


A bad connection could be it, possibly a failing relay. One would have to pull some paneling off, possibly the steering wheel covers, to start looking for the problem.
Coming out of the ignition switch will be a start wire, an accessory wire, and a run wire. The run wire is for both the ignition system and for the gauges and warning lights. One splice of this run wire will go to the fuse panel, to power up those fuses that are termed "hot in run or accessory". Or sometimes, the run wire energizes a relay that sends power to the fuse panel. One of these fuses will be for the gauges and warning lights in the dash.
If you have a test light or voltmeter, you could check the fuse terminals for power at those times when the gauges are not working. If the fuse terminal shows no power when the key is on, then the problem is between the ignition switch and the fuse panel. This could be a relay that is not working- probably called an ignition relay-and it may be right around the fuse panel. If the fuse terminals do have power when key is on, but gauges are not working, the problem is between the fuse panel and the dash-will probably need to pull the dash cluster out to look further-possibly the electrical connector or connections at the cluster. If you wiggle the wiring around the fuse panel and the ignition switch and see the gauges move (key on), then you are wiggling a bad connection and can find and fix it.

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1 Answer

Fuel gauge stopped working on my 94 mercury grand marquis. how do i fix it , could it be a fues


The fuel gauge gets power from the same circuit as the warning lights. If those lights work when you turn the key on, the gauge has power.
Chances are the problem is the sending unit in the gas tank, or the gauge itself.

May 16, 2013 | Mercury Grand Marquis Cars & Trucks

1 Answer

1987 Chevy silverado gauge / idle fuse keeps blowing


The 20amp ga/idle fuse powers a hot fuel module which powers the oil pressure switch, the fuel pump relay, and the fuel gauge in the tank.
Any of the four components including the fuel pump can blow the fuse.

Jul 23, 2012 | Chevrolet Cars & Trucks

1 Answer

1998 GMC Sonoma. The fuel gauge is stuck on a bit over 1/2 tank, but it drops down to empty when I shut the engine off. Is it the sendin unit, or could it be something else? Thanks in advance.


If you don' having any wiring issues I would think you should look into the gauge.
The gauge has a memory. It is supposed to stay in its last position when the key is turned off. There would be no more power going to the gauge once they key is turned off so it can no longer read resistance to ground from the sender.

Sep 01, 2011 | 1998 GMC Sonoma

1 Answer

2000 dodge caravan 3.3 motor,,,,,,,we put the key in the ignition,, turn the key to unlock it,, turn key to light up odometer & shift indicator,,,, then there is another click to power up the rest of...


sounds like you have instrument cluster problem it probley has a short which would cause the security system to lock thinking that the van was being stolen i have has this problem before. hope this helps.

Jan 09, 2011 | 2000 Dodge Caravan

1 Answer

It won't turn over and gauges won't come on. battery is charged


check the ignition switch to see if power is going through it with key on. if any other thing works with key on, then there is some power through switch. check switch power.

May 14, 2010 | 1993 Geo Storm

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