Author Topic: MOT failure dimming light  (Read 430 times)

Itsme

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MOT failure dimming light
« on: January 21, 2022, 11:24:26 AM »
Hi All

Getting fed up now with niggling electrical faults on the Mighty Midget. Took it for an MOT and it failed on three minors (missing split pin in the front wheel nut which must have not been put back last time I had the wheel off, tight throttle cable raising engine revs slightly when turned to the right) and the rear side light (position lamp) dimming in time with the indicators.

This morning I have re-made all of the connections to the rear light, improved the earth connection, checked battery voltage, charging etc and even with the engine running it still dims. The frustrating thing is it is only ever so slight and on a sunny day probably wouldn't be noticeable.

I'm not sure what to try next to be honest. Any thoughts or suggestions very welcome.

Spartacian


Moto63

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Re: MOT failure dimming light
« Reply #1 on: January 21, 2022, 12:31:06 PM »
A full rewire 🤷???🤷???

Itsme

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Re: MOT failure dimming light
« Reply #2 on: January 21, 2022, 02:05:21 PM »
Hi Michael

To be honest you are probably right but then if I do a rewire the frame could do with powder coating to stop the continual rust. If I do that then whilst the motor is out I should really check it over see if I can stop it burning oil. If I do that I should perhaps have a look at the wheels, see if new rims would look better. If I do that the paintwork generally could do with a re-paint. And so on and so on.

I think today I am just fed up with working on the flippin' thing all the time and would kill to have my Honda CRF250 Rally back ( kill the scrote who nicked it after it was only six weeks old). But when I have got it sorted and the sun is out and the roads are dry I will love it again.

I have now re-wired the rear light and indicators with better earths, re-earthed the front indicators and pilot light and changed the fuse holder. I have ordered a new battery as the one on the Midget may be older than I remember. Honestly can't think of anything else.

Spartacian

themoudie

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Re: MOT failure dimming light
« Reply #3 on: January 21, 2022, 06:43:09 PM »
Aye Spartacian,

Make sure the main earth strap from the battery to the frame and the frame to the engine is made from a good heavy guage copper wire, with crimped, soldered and heat shrunk terminals attached. That the frame and engine cases beneath the terminals are clean bare metal, with stainless steel or clean  steel fixings, with either serrated washers or spring washers that "bite" into the cleaned metal and keep the fasteners tight. Finally, once tightened, spary librally with ACF50 and cover with a good "dod" of petroleum jelly.

New batteries etc. will not cure the problems if the main earth is suspect.

My apologies if this is telling my Grandmother how to suck eggs!

Good health to you and the Mighty Midget, Bill

Itsme

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Re: MOT failure dimming light
« Reply #4 on: January 22, 2022, 02:53:48 AM »
Apologies not necessary Bill as despite re-making the earth connections to the lamps etc the one thing I didn't do was check the main earth! Guess what I'm going to do first thing in the morning.

Thanks

Spartacian

iansoady

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Re: MOT failure dimming light
« Reply #5 on: January 22, 2022, 10:37:53 AM »
I agree almost certainly earth although if you're testing without the engine running and the battery is past the first flush of youth (aren't we all?) it may just be that it can't keep up with the load.
Ian.
1952 Norton ES2
1980 Honda CB250RSA

Itsme

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Re: MOT failure dimming light
« Reply #6 on: January 22, 2022, 03:09:32 PM »
Thanks both.

I checked the main earth, cleaned it all up and know it now to be fine. I do think my battery is suspect so I've ordered a replacement anyway as there are signs of one being needed.

Once the new battery is in place I hope all the work I have done on redoing earths will solve the problem, if not I am officially stumped.

Will let you know when the battery arrives and has been fitted.

Spartacian

themoudie

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Re: MOT failure dimming light
« Reply #7 on: January 22, 2022, 10:24:17 PM »
Fingers crossed! ;)

Bill

Itsme

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Re: MOT failure dimming light
« Reply #8 on: January 27, 2022, 10:54:05 AM »
Hi fellas

Some years ago I went on a first aid course and the tutor started by teaching us the difference between 'sort of dead' and 'proper dead'.

Well I have moved from 'sort of fed up' to 'proper fed up' with this bloomin' dimming light.

So far I have;

Replaced all earths for indicators to separate, good earth points.
Replaced earth connections for front and rear lights to separate, good earth points.
Cleaned and re-made main earth cable connections to battery.
Put on new battery (which it needed anyway).
Checked charging.

So where do I go from here? I did notice that the neutral light dims slightly when the brake light is applied or the indicators switched on. Is this a clue? Even though I have cleaned the main earth to the battery and engine cases is it possible that the cable itself is at fault? Do the electrickery Pixies just hate me? Should I take out a huge loan and buy a brand new Honda?

Any and all help really appreciated chaps as a grown man crying in his own garage is so undignified.

Spartacian

Itsme

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Re: MOT failure dimming light
« Reply #9 on: January 27, 2022, 11:43:44 AM »
Quick update. It isn't the main earth strap as I found one from a Honda and tried that and same result. I even tried putting a cable directly from the engine earth to the frame and no better.

I am honestly at my wits end. If I had another bike this one would go into the back of the garage to gather dust and be forgotten about.

Spartacian.

iansoady

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Re: MOT failure dimming light
« Reply #10 on: January 27, 2022, 11:48:25 AM »
Does it happen when the engine is running (charging) or only when it's running off the battery? I've spent months fitting LED indicators to the ES2 - will recount the whole saga sometime - but found that the flasher unit needed 6.4 volts to work. If I put the (non-lED) brake light on it dropped the voltage so that the indicators wouldn't work.

I finally fixed it with a step-up voltage device from ebay - about £4 for three. This works brilliantly even with a half-flat battery. As I have 2 spare, if you let me have your postal address I'll send you one. It might work for you.......

These are the chaps: https://www.ebay.co.uk/itm/334237098344
Ian.
1952 Norton ES2
1980 Honda CB250RSA

Itsme

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Re: MOT failure dimming light
« Reply #11 on: January 27, 2022, 04:12:21 PM »
Hi Ian

That is very kind of you. It does do it when the engine is running but lessens to virtually nothing as the revs rise to 5 or 6 thousand.

My address is;

55 Columbia Avenue
Sutton in Ashfield
Notts
NG17 2GZ

I have never heard of these step up devices so it will be interesting to try one. If you won't let me cover the cost I will stand you a beverage of your choice some time.

Thanks

Spartacian (Smith by the way)

Moto63

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Re: MOT failure dimming light
« Reply #12 on: January 27, 2022, 05:16:12 PM »
I’m sorry to hear about your wiring woes Ian, nothing more frustrating. If it were me I’d defo rip the lot off and rewire it. Don’t throw good money after bad and don’t waste anymore of your time messing with it. Once you’ve bought the materials required to wire it, you’d probably have it completely done in a weekend, especially given that you’ll have the original harness to work from. Plus once it’s done you can ride around happy in the knowledge that it’ll keep going hassle free for a few more years to come. Best of luck with it. Oh and don’t let it wear you down 👍👍
Cheers Michael

Itsme

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Re: MOT failure dimming light
« Reply #13 on: January 27, 2022, 06:52:20 PM »
Thanks Michael I appreciate the encouragement. It would be worth doing as other than this silly fault I love the Mighty Midget and intend to hang onto it for a good while to come.

Spartacian

iansoady

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Re: MOT failure dimming light
« Reply #14 on: January 28, 2022, 10:40:47 AM »
I'll get one in the post today. And look forward to the beverage......
Ian.
1952 Norton ES2
1980 Honda CB250RSA