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Stop light blowing fuse

Submitted by michael_addison on Wed, 13/05/2020
Forums
Electrical

Afternoon folks,

I hope everybody is safe and well and coping with this house arrest.

I have a 1958 Dominator "99" still on 6 volt electrics. The electrics work except that when I press the brake light switch it blows the fuse, I have tested this twice and each time the same result - a blown fuse.

Can somebody tell me where to look first to see how I can fix this fault?

Many thanks,

Ride safe ( when we are released).

Cheers Mick

Submitted by jonathan_newton on Wed, 13/05/2020

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... at the wiring from the switch to the tail light.  Points of interest will be where the cable passes  through sheet metal or is clipped to sheet  metal r(ear fender) with metal edge clips.  Failing that there may have been some damage to the cable under the mudguard that has shorted the brake core out or there is an issue with the bulb holder or bulb.

Try it (with the bulb across the fuse holder as John suggested) by remove the rear bulb.  This will focus your attention to the bulb holder.

 There is no mystery to this, it is a simple fault caused by old age...    ...of machine, or man.....

;-)

PS: blowing the fuse is not testing

Submitted by michael_sullivan on Wed, 13/05/2020

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There is no fuse in the brake light circuitry on a standard '58 Model 99.

So, this begs the question:  Did you install the fuse or did a previous owner do it?

What is the ampere rating of the fuses that are blowing and what is the wattage of the bulbs?

Did this blowing fuse situation recently occur after many years of acting normally?

Inquiring minds need to know.......

Mike

 

 

 

Submitted by michael_addison on Thu, 14/05/2020

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Thanks folks,

I will try as you suggest with a light bulb.

The fuse was put into the system several years ago by myself and has not caused any trouble until now. Yesterday everything worked until I depressed the brake pedal . I checked the fuse which had blown ; I  replaced the fuse then depressed the brake light switch and the same thing happened. I will check the rating of the fuse.

I took the tail off the mudguard and could find no chafing or anything which would cause an earthing.

Thanks for your input, I will let you know.

Cheers Mick

Submitted by mikael_ridderstad on Thu, 14/05/2020

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Several years later you had the rest of the electrical system protected from a short!

 



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