Electrical issue

Mustang Australia

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Offline streetrod

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Electrical issue
« on: December 16, 2022, 12:05:57 am »
 :cry: hello, one for the electrically minded, I have a 67 fb no previous issues until now, no brake,taillights or dash lights, could this be the main lightswicht playing up, headlights come on but nothing else all fuse are good, thanks in advance!

Offline pmb0186

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Re: Electrical issue
« Reply #1 on: December 16, 2022, 02:17:14 pm »
You should really check your fuses electrically rather than just physically.
get a millimeter and measure 12v at each fuse with ignition on both sides and on the fuse clamp rather than fuse body.
A common problem is rust on the terminals on the fuse block and rust not being a conductor.
Just for clarity measure ground to the fuse and the point of both sides is if you measure 12v on one side and nothing on the other its a open circuit fuse.
start there
does anyone remember laughter

Offline 6t9m1

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Re: Electrical issue
« Reply #2 on: December 16, 2022, 10:21:09 pm »
As the power is being feed from the headlight switch to the circuits you mentioned it would be a safe bet you have provided your own answer…and that could be the headlight switches internal circuit breaker or the sliding contacts areas.

Offline streetrod

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Re: Electrical issue
« Reply #3 on: December 18, 2022, 03:02:44 pm »
Thanks for your input, I was heading in that direction as I have had no issues previously to now, I will get new headlight switch, hopefully solve the problem 👍

Offline AussiePhil

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Re: Electrical issue
« Reply #4 on: December 18, 2022, 05:19:43 pm »
Hey Streetrod,
If you’re sure it’s the Light Switch it could be just the plug connector to the switch, pull it out and check it’s contacting correctly, could be just a dry joint, give it a spray with CRC or WD40, And give it a wiggle.
Check there are no wires dislodged. Try that before you spend your hard earned.
Electrical problems are a pain!
Cheers Phil.
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline Dingo80

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Re: Electrical issue
« Reply #5 on: December 18, 2022, 08:17:30 pm »
Hey Streetrod,
If you’re sure it’s the Light Switch it could be just the plug connector to the switch, pull it out and check it’s contacting correctly, could be just a dry joint, give it a spray with CRC or WD40, And give it a wiggle.
Check there are no wires dislodged. Try that before you spend your hard earned.
Electrical problems are a pain!
Cheers Phil.

Don't use WD40 or CRC use contact cleaner

Offline AussiePhil

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Re: Electrical issue
« Reply #6 on: December 18, 2022, 08:26:09 pm »
Hey Streetrod,
Have just noticed they’re not that expensive, I’d get one either way to be sure!
If your near the ocean use CRC 66.
Another great product is Lanotec spray (Wool Fat).
And Lanotec grease used on your tow bar tongue and ball, it takes up the slack and quietens the backlash, it’s very gummy though, take the tongue when not using it.

Cheers Phil.
« Last Edit: December 20, 2022, 07:25:34 pm by AussiePhil »
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!