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Instrument cluster does not light up

Tiny
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Check the wires back to the sender. You should have a low voltage to the sender. About 7 volts. Then when the float goes up and down, resistance will change the voltage back to the cluster on the return wire. Check the wires first.

Roy
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Friday, May 28th, 2021 AT 10:28 AM
Tiny
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Okay. I will let you know shortly.
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Friday, May 28th, 2021 AT 10:32 AM
Tiny
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Sounds like a plan.

Roy
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Friday, May 28th, 2021 AT 10:37 AM
Tiny
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It seems to be moving from.05 volt to just over 1 volt?
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Friday, May 28th, 2021 AT 1:07 PM
Tiny
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If that is at the sender unit with the connector disconnected, then go back to the cluster and check the output from the cluster.

The cluster is what sends power to the sender unit itself. If you have around 7 volts, then you have a wiring issue from the cluster to the sender.

Roy
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Friday, May 28th, 2021 AT 1:13 PM
Tiny
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I will check. And I have a constant power at the orange and the red wire (next to the orange) with the key off. I just tested it to see if this helps?
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Friday, May 28th, 2021 AT 1:34 PM
Tiny
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No, only test for power with the key on. You need the correct voltage from the cluster for the gauge to work. The gauge should not work with the key off at all.

Roy
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Friday, May 28th, 2021 AT 1:46 PM
Tiny
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I was referring to the fact of the cluster staying on with the key off. What color wire should I be testing at the cluster for voltage to the fuel sensor? I can't find it on the schematic.
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Friday, May 28th, 2021 AT 1:48 PM
Tiny
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Okay, I sent another diagram for you. The 2 wires for the sender come from the ECM. I highlighted the wire. They are purple and orange/black. The purple is the sent voltage and the orange/black is the return. From there, it is sent by serial data line to the cluster.

Test those wires. The connector numbers are marked in the diagrams. The purple wire should have power back at the sender with the key on.

Roy
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Friday, May 28th, 2021 AT 2:11 PM
Tiny
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I checked and I'm not showing any voltage on the purple wire right at the ECM.
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Friday, May 28th, 2021 AT 3:09 PM
Tiny
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Okay, then you may have a bad ECM. I attached the procedure below.

Roy
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Friday, May 28th, 2021 AT 3:57 PM
Tiny
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Not what I want to hear, lol. Is there any fuse that may be related to this issue? If this is the only issue I'm having can I get power from somewhere else?
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Sunday, May 30th, 2021 AT 10:24 PM
Tiny
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There is no fuse for this control and there is no overlay you can do to get it to work. Sorry, you need to replace it based on your results.

Roy
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Monday, May 31st, 2021 AT 12:54 AM
Tiny
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Okay. I appreciate that. As for the pink wire in the cluster that seems to be saying it's positive with the key off, the diagram you sent me shows ignition o volts, I don't understand if that is just supposed to be ignition "on" or something else.
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Monday, May 31st, 2021 AT 3:18 AM
Tiny
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The ignition on, sorry.

Roy
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Monday, May 31st, 2021 AT 4:19 AM
Tiny
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It's just something funny I wanted to send you since we have been dealing with wiring issues.
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Monday, May 31st, 2021 AT 8:19 AM
Tiny
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Oh my goodness. What is that and how is it hooked up?

Roy
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Monday, May 31st, 2021 AT 8:28 AM
Tiny
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I'm not sure, it's just a picture I found online. It just feels like what I was doing with all the wires. Lol
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Monday, May 31st, 2021 AT 8:30 AM
Tiny
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Is that what is under the hood of your truck? If not, why are you posting it? I do not understand.

Roy
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Monday, May 31st, 2021 AT 8:32 AM
Tiny
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It's not my truck. It was just something funny I seen on the internet and I wanted to send you for a laugh.
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Monday, May 31st, 2021 AT 8:35 AM

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