Question about 1991 Toyota Pickup

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There is no power to the inside of the cab... no dash lights, no gauges, no radio... but most important, no ignition. is there a main fuse or relay that could cause this?

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First of all, check to make sure the battery terminals are not corroded out (Even if they aren't, for insurance, take a piece of sandpaper to terminals and connectors). Then, go along all the cables to make sure that they are not fried and burnt. Finally, pop open the fusebox, and check all the fuses to make sure none are blown. I bet your problem is in the battery, however, assuming that brake/backup/back lights are still on. A weak connection will allow precious little to run, but some may.

Posted on Apr 07, 2011

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check head lights first and dash heater blower on high first.????
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it only takes 2 thing to fix this, a voltmeter and a schematic
does car run.?
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FOR SURE ITS fuse blow. my wild guess is you dont know how
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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.

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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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What is the cable connected to the ignition that controls the dash board's gadgets


You mean by gadgets, warning lights and gauges? That would be from the ignition switch's run wire, the wire from the on position. This wire sends voltage to the ignition system, and to the dash for the warning lights and gauges-but not directly to the dash-the signal would reach the dash after being routed through the fuse panel to a fuse for the dash gauges and warning lamps. You need to check if that fuse is good.
Recall seeing any wiring diagram? The fuses are labeled either "hot at all times" or "hot in run or start". The fuses labeled hot in run or start are only sent power when the key is on, so power for those fuses are routed through, or turned on by the key being on. Depending on the car and its wiring set up, many will have relays that are turned on by the run wire, and power is then sent from the relay to that circuit's fuse in the fuse panel. This relay may be called the ignition relay. Or your car may have a different relay to send power from the run wire to the fuse panel.
The only way to figure yours out is to see a wiring diagram for it. Then you will see how power is sent from the ignition switch to the dash.
Wiring diagrams are almost always found in repair manuals. Check if your library has a manual for your car. Most libraries have quite a few repair manuals. Or parts stores sell repair manuals too, for about $25. Try to find a Haynes repair manual for your car. The other popular repair manual is from Chilton. My preference is Haynes, just my preference. I been burned by Chilton manuals sooo many times-incomplete wiring diagrams, incorrect information, incomplete information. Haynes are not perfect by any means, you want perfection-spend big bucks for a factory service manual ! In general, Haynes is more complete than Chilton.
OK, enough venting. If you have a test light, check for power at the fuse for the dash (may be labeled "gauges" or "instr pnl", something like that) with the key on. If it has power with key on, wire from the fuse goes to the dash. If that fuse has no power to it with key on, power has been lost between the ignition switch and that fuse-now you definitely need a wiring diagram to find the problem.

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My 97 Camry has no inside power, no radio, power windows, lights, dash lights, nothing. I changed the ignition switch, and put a new battery in, and there is still no power inside the car. Has anyone else...


There is a fusable link from your battery to everything inside the car. 62468983
See FL Main 3.0W - I believe that is where your problem lies. If all your fuses are good...that is the culprit. Good luck!

62468439

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