Search found 1355 matches

by cactusman
Sun Nov 18, 2018 9:47 am
Forum: General
Topic: Open Day April 2019
Replies: 9
Views: 234
Great Britain

Re: Open Day April 2019

Hi. I'd be interested

Steve&Jo (TheDampMan)
Jonathan
David Jones
Richard Hartfall
Steve Hook (mgcjag)
John (johnetype)
Julian aka cactusman
Please cut and past to add your name to the list
by cactusman
Thu Nov 15, 2018 9:18 pm
Forum: Technical
Topic: Clock
Replies: 3
Views: 183
Great Britain

Re: Clock

Fiddly and you get neck ache but entirely doable
by cactusman
Wed Nov 14, 2018 3:51 pm
Forum: Technical
Topic: Help pls - Alternator voltage too high, blowing LEDs?
Replies: 21
Views: 446
Great Britain

Re: Help pls - Alternator voltage too high, blowing LEDs?

No way of knowing without reference to the data sheet. A simple protection against brief spikes in voltage can be provided by putting a 2.2 ohm 1 watt resistor in the positive and then connecting a 18volt 5 watt zener diode to ground after the resistor. Part no for the zener is 1N5355B. It will soak...
by cactusman
Wed Nov 14, 2018 2:56 pm
Forum: General
Topic: Crimbo pressie idea?
Replies: 7
Views: 280
Great Britain

Re: Crimbo pressie idea?

Front bumper line looks a bit odd....wonder what the engine looks like....?
by cactusman
Wed Nov 14, 2018 8:01 am
Forum: Technical
Topic: Help pls - Alternator voltage too high, blowing LEDs?
Replies: 21
Views: 446
Great Britain

Re: Help pls - Alternator voltage too high, blowing LEDs?

Id guess your dimmer device is a variable pulse width modulator type. It very rapidly turns the leds on and off. By varying the relative off and On times the dimming is achieved. If it works then fine.
by cactusman
Tue Nov 13, 2018 8:30 pm
Forum: Series 2
Topic: Restored Car...What to do before putting on the road.
Replies: 13
Views: 477
Great Britain

Re: Restored Car...What to do before putting on the road.

Minor point but image 6 looking at the sump and exhaust pipes I see two pipe clamps with the nuts and hence the u clamp stud ends sticking down. Bound to catch on a road hump. Turn them 90 degrees so the studs don't point down :bigrin:
by cactusman
Tue Nov 13, 2018 4:35 pm
Forum: Series 2
Topic: Horn wiring & lighting relay mod questions
Replies: 4
Views: 105
Great Britain

Re: Horn wiring & lighting relay mod questions

I fitted mine below the sugar scoops......so far no issues :bigrin:
by cactusman
Tue Nov 13, 2018 4:32 pm
Forum: Technical
Topic: Help pls - Alternator voltage too high, blowing LEDs?
Replies: 21
Views: 446
Great Britain

Re: Help pls - Alternator voltage too high, blowing LEDs?

If you want to build your own driver it is not difficult providing the forward voltage drop of your LED string is less than the 12 volt supply voltage. The one in your image has a buck converter that steps the output up to 32 volts to drive long strings of LED's and seems to need the output complete...
by cactusman
Tue Nov 13, 2018 7:33 am
Forum: Technical
Topic: Help pls - Alternator voltage too high, blowing LEDs?
Replies: 21
Views: 446
Great Britain

Re: Help pls - Alternator voltage too high, blowing LEDs?

The simple answer is they are not really suitable for use in a vehicle. BOTH sides of the LED bulb here to be isolated from ground. They seem to limit at 350/700/1000 mA which will be for high power leds that will be far too bright for instrument lighting. Buy well designed (not cheapo) led bulbs de...
by cactusman
Mon Nov 12, 2018 9:27 pm
Forum: Technical
Topic: Help pls - Alternator voltage too high, blowing LEDs?
Replies: 21
Views: 446
Great Britain

Re: Help pls - Alternator voltage too high, blowing LEDs?

Too complex to go into here but light emitting diodes should be powered from a constant current supply unlike filament bulbs which are powered from a constant voltage supply. Any good quality LED bulb will incorporate a current source and will usually operate from about 10 volts to 24 volts or more ...
by cactusman
Mon Nov 12, 2018 4:25 pm
Forum: Technical
Topic: Help pls - Alternator voltage too high, blowing LEDs?
Replies: 21
Views: 446
Great Britain

Re: Help pls - Alternator voltage too high, blowing LEDs?

14.6 volts is well within normal range for a 12 volt system. The LEDs will be fine. If it gets much above 15.5 volts I would start to get a bit concerned and anything above 16 and the alternator regulator has probably failed. The LED bulbs will probably be fine but the battery may not fair so well...
by cactusman
Sat Nov 10, 2018 8:13 pm
Forum: General
Topic: Possible server issue
Replies: 4
Views: 159
Great Britain

Re: Possible server issue

Thwnks.....Will try A first... :bigrin:
by cactusman
Sat Nov 10, 2018 6:52 pm
Forum: General
Topic: Built by Many
Replies: 59
Views: 3484
Great Britain

Re: Built by Many

Me too. Apparently Edd will not be evident for now as he is busy with other projects.....they hope to release an episode at the end of each month... :bigrin:
by cactusman
Sat Nov 10, 2018 6:00 pm
Forum: Series 1
Topic: 4.2 ameter oscillation
Replies: 7
Views: 185
Great Britain

Re: 4.2 ameter oscillation

Hard to know but if the charge is intermittent the needle will swing wildly as it is not damped. Check connections and if they are ok suspect the regulator that sits under the heater box.
by cactusman
Sat Nov 10, 2018 5:57 pm
Forum: General
Topic: Possible server issue
Replies: 4
Views: 159
Great Britain

Possible server issue

Since the long outage it is noticeable that typing into the window takes ages for the text to catch up with the typing....and for me frequently crashes the window. Tried on two machines and no, it is not my broadband as no other site is affected.....wonder if anyone else is having the same issue.......
by cactusman
Tue Nov 06, 2018 8:03 pm
Forum: Technical
Topic: Lumenitron Magnetronic
Replies: 3
Views: 199
Great Britain

Re: Lumenitron Magnetronic

I suspect you have wired it wrongly....and may have cooked it. I suspect t it should be wired as follows. Red to ignition positive. Black to CB terminal on the coil, the other coil terminal being connected to ign positive. Negative is the metal body of the module. So to test connect red to +, the bu...
by cactusman
Sun Nov 04, 2018 10:32 pm
Forum: Series 2
Topic: Restored Car...What to do before putting on the road.
Replies: 13
Views: 477
Great Britain

Re: Restored Car...What to do before putting on the road.

When I did my mg years back the first runs were fraught with nerves. As said brakes, coolant and oil levels. Also look for fuel leaks and electrical gremlins too. Take it gently until you are sure all is
Well. Have fun :bigrin: :bigrin:
by cactusman
Wed Oct 31, 2018 11:03 pm
Forum: General
Topic: After market LED lights. Legal UK?
Replies: 28
Views: 4348
Great Britain

Re: After market LED lights. Legal UK?

Well spotted jerome....however the 1971 regulations section 15 subsection three make clear as I read it that the wattage applies to an electric bulb with a filament....and led bulbs have no filament. So one could argue that the wattage does not apply hence once can use an LED bulb. Equally one could...
by cactusman
Wed Oct 31, 2018 8:27 am
Forum: General
Topic: After market LED lights. Legal UK?
Replies: 28
Views: 4348
Great Britain

Re: After market LED lights. Legal UK?

Here is my take.....the road vehicles regulations 1989 are not retrospective - our cars were built long before they came in so there is no reason from a wattage point of view. All cars post 1980 something must use E marked bulbs but there was no such thing as an E marked bulb in 1970..technically ou...
by cactusman
Tue Oct 30, 2018 7:06 pm
Forum: Technical
Topic: dynamo repair
Replies: 3
Views: 187
Great Britain

Re: dynamo repair

Google refurbished lucas dynamo. There are companies that refurbish them....or search ebay as they show up there too....