General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

Half of Dash lights not working???

Old Feb 8, 2022
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From: Courtenay
Half of Dash lights not working???

So I was changing the bulbs in my gauge cluster and when I went to test them the tachometer, left turn signal, HighBeam lights and the left bulb on my climate control weren't working. I've rotated the bulbs and checked all the fuses and nothing seems to be blown. and high beams and left turn signal still works on the outside
2009 Fx4

 
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Old Feb 8, 2022
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Did you install LEDs? If so, the may be polarity-sensitive.
 
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Old Feb 8, 2022
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Ye I've rotated the bulbs, said that in the original post. they are LED though
 
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Old Feb 8, 2022
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If it's more than one lamp, I'd be looking for a ground issue.
 
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Old Feb 8, 2022
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Have you test the "new" bulbs by swapping with known working bulbs/locations?

"new" means never ever tested, not "it works"
 
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Old Feb 8, 2022
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From: Courtenay
Originally Posted by RonD
Have you test the "new" bulbs by swapping with known working bulbs/locations?

"new" means never ever tested, not "it works"
Yea I've put the working condescent bulbs back in and still no dice. I've checked the ground under the driver seat and the grounds under the good and they are all grounding properly
 
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Old Feb 8, 2022
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Dash ground is on firewall but probably not your issue, there are only 2 grounds maybe 3 so would have many more bulbs out with bad ground

The 6 illumination bulbs in 2009(2004 and up) all share one ground and one 12v wire(older clusters had 2 12v wires)
12v wire is of course from dimmer so 0v to 12v

Sorry forgot that you can't use the old incandescent bulbs to test when installing LEDs, all the voltage will go to the lower resistance LEDs so none to the other bulb type because they are in parallel wiring type setup
Have to use known working LED to test for those lights
Individual bulbs like turn or high beam should be OK to swap to incandescent to test

Wiring diagrams below
2008 and 2010, so 2009 will be exactly the same

2008 diagram is overall so you can see the wires that should have 12v when active
 
Attached Files
File Type: pdf
2008 instrument-cluster.pdf (32.5 KB, 71 views)
File Type: pdf
2010 cluster light 2.pdf (53.7 KB, 64 views)

Last edited by RonD; Feb 8, 2022 at 05:37 PM.
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Old Feb 8, 2022
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ok right on, thanks for the helpful answers! I will give it another go this coming weekend.
 
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