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Why Isn't There Any Power to #3 Fuse for Instrument Panel Lights?
#1
[Image: ford-mustang-fuse-box-diagram-1971-300x172.jpg]

#3 Instrument panel, cluster, ash tray & cigar lighter illumination

All other fuses are hot on both sides except the tiny fuse (#3) which has no power either side. Any suggestions? 
PS: You guys helped me with my turn signal switch and fuse box corrosion, I'm back for more!
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#2
(09-24-2018, 12:17 PM)Rumblefish Wrote: [Image: ford-mustang-fuse-box-diagram-1971-300x172.jpg]

#3 Instrument panel, cluster, ash tray & cigar lighter illumination

All other fuses are hot on both sides except the tiny fuse (#3) which has no power either side. Any suggestions? 
PS: You guys helped me with my turn signal switch and fuse box corrosion, I'm back for more!

I had a similar issue and it turned out that my light switch was bad. It only actuated the headlights, but wouldn't work to light up the instrument panel or anything like that

Gas is for cleaning parts, alcohol is for drinkin, nitro is for racin
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#3
I was thinking the same thing and I replaced the headlight switch last night.  Shouldn't the fuse block be hot at all times? I think I will find out which wire feeds the fuse block and trace it back. It might come from the battery.
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#4
No, the #3 fuse power is fed from the rheostat in the light switch. The light switch and lights are protected by a built-in circuit breaker that carries too much current for the dash lights and circuit board.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
[+] 1 user Likes Don C's post
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#5
So when I turn my lights on (either running lights and or headlights, the fuse should become hot)? I'll have to take a look at that.
TY Don C.
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#6
Yes, that is correct. The rheostat in the light switch, that controls the voltage to the dash light bulbs, can fail and all the lights, except power to fuse #3 and dash lights will work.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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