instrument cluster lights
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5th Wheeling
Joined: Sep 2006
Posts: 26
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instrument cluster lights
i have a 78 f100 that i gave to my son. he just replaced the head light switch for flickering problem. the flickering is gone and now so is the instrument lighting.
when i turn on the dome light it starts to flicker and i can hear a clicking noise under the dash. anybody got any ideas as where to start or have good readable wiring diagram that might be willing to send me. thanks
when i turn on the dome light it starts to flicker and i can hear a clicking noise under the dash. anybody got any ideas as where to start or have good readable wiring diagram that might be willing to send me. thanks
Junior User
Joined: Jul 2003
Posts: 60
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From: Helena, MT
I'd pull the instrament cluster out, make sure that the wires going into it arent cut, then I'd make sure that plastic thing on the back of the cluster with all the copper lines running through it isn't burnt out. I had to replace mine with a junk yard special. I used to have the flicker problem and replaced my headlight switch and everything worked after that. Maybe you got a faulty one.
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Welcome to the FTE site 
Sounds like you need clean up all the grounds in the lighting system.
Plus,where the voltage regulator mounts.
The "type" of headlight and cluster lighting flickering is can be caused by a couple of things.
The Voltage regulator and the condition of being mounted can be the cause of flickering like you describe.
Clean up the grounding area and coat with di-electric grease to prevent further corrsion and problems.
Check and clean, ....then secure all grounding spots.
There is a also another type of headlight flickering that is caused by the built-in Circuit breakers in the headlight switch.
This is Ford's bad design and a lot of people opt for the "Relay Type" system that can be done.
Doing this takes the load off the circuit breaker and instead routes the power direct from the Battery.
Result: No more flickering headlights
You can read about it here.
https://www.ford-trucks.com/article/...r_Brights.html
BTW, just because you buy a NEW part... doesn't mean it's going to be good.
You should also clean up around the floor dimmer switch.
They are known to cause problems as well from moisture & corrosion.
Belldog said: then I'd make sure that plastic thing on the back of the cluster with all the copper lines running through it isn't burnt out.
That part is called a "Printed Circuit"
Sounds like you need clean up all the grounds in the lighting system.
Plus,where the voltage regulator mounts.
The "type" of headlight and cluster lighting flickering is can be caused by a couple of things.
The Voltage regulator and the condition of being mounted can be the cause of flickering like you describe.
Clean up the grounding area and coat with di-electric grease to prevent further corrsion and problems.
Check and clean, ....then secure all grounding spots.
There is a also another type of headlight flickering that is caused by the built-in Circuit breakers in the headlight switch.
This is Ford's bad design and a lot of people opt for the "Relay Type" system that can be done.
Doing this takes the load off the circuit breaker and instead routes the power direct from the Battery.
Result: No more flickering headlights
You can read about it here.
https://www.ford-trucks.com/article/...r_Brights.html
BTW, just because you buy a NEW part... doesn't mean it's going to be good.
You should also clean up around the floor dimmer switch.
They are known to cause problems as well from moisture & corrosion.
Belldog said: then I'd make sure that plastic thing on the back of the cluster with all the copper lines running through it isn't burnt out.
That part is called a "Printed Circuit"
Last edited by Mil1ion; Sep 12, 2006 at 08:31 PM.
Thread Starter
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5th Wheeling
Joined: Sep 2006
Posts: 26
Likes: 0
thanks
thanks guy for your help . found the problem my son had a bad ground on the radio he installed . and we found that the new headlight switch was bad from stock. reinstalled the original switch and found a solid ground for the radio and every thing works normal . thanks again
