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Voltage stabiliser


Chris A
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Hi everyone on this HOT afternoon.

I am beginning to suspect the voltage stabiliser is on its way out.

The temp gauge recently started to read higher than before, it is a new sensor but the previous was doing the same (I think). The feul gauge which normally was fairly accurate also seems to reading high. The gauge goes up to a goog 3/4 point and tends to stay there with occasional slight drops and rises to just nudge the red.

I usually fill with fuel when the gauge is close to 1/4 when it would take 20 somethin litres. Today the needle was mid way between 1/2 & 3/4 and needed 16 and a bit litres, i.e.slightly over 1/2 a tank. It may be that as the needle drops it does get more accurate.

Before anyone asks, no coolant is being lost, thermostat & rad cap haven't been changed. The top hose can be touched after a long run and the bottom one is noticeably cooler. I have ordered an infra red ray gun to check the temperatures.

Cooling system has recently been flushed out.

I checked the voltage arriving at the temp sensor a got fluctuating readings with a high of 10.8 lots of 10 point somethings, 9s and also very low scores as well. I havn't calculated an average as that would require noting the voltage and time duration... What sort of readings should I get?

I would just order a new stabiliser but, as you all know, Triumph chose to mount it in, lets say, a less than convienient location!

"Hot & bothered" in Normandy ?

 

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Chris,

There is no reason for the stabiliser to be where it is, just convenient during factory assembly. I would leave it there, get the wires off and connect to an electronic replacement, light enough to dangle behind the dash. £10/11 on Ebay.

Doug 

 

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Chris, sounds right to me.  As the original voltage stabiliser sends a series of pulses who's average is 10 volts the only way you can test the thing is with the slow acting, hot wire, Voltmeter. If both gauges are reading high as you say odds on it's the stabiliser. 

It was a clever design for its day 1950's as electronic weren't robust or small enough at that time.

Be careful not to short the replacement electronic type to earth as they don't have any overload protection and will burn out. Using a 7810 chip, which does have protection is a better bet. See the early Spitfire Column in this months Courier.

Don't do your back in changing it!

Dave  

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Just had a quick look for other postings referring to the voltage stabiliser. There are a lot. Now thinking about changing mine. There are loads listed on ebay, so can someone point us all in the right direction with a reference for the correct unit. Also (Doug/Pete/Dave) can you list the guages that are sensitive to having a dodgy VS. Thanks

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BW,

the one I bought was this, I think, Ebay No. 132692934426, (sorry can't copy and paste at the moment) 12 volts in, 10.5volts out and earth. Be sure to tell him if you are _ve or +ve earth

The gauges it feeds are Fuel and Temperature. You'll see above in Chris's original, if both gauges are acting up it's the VS responsible!

Doug

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just refering to Dougs fast typing   he's known to manage 3500 letters a minute , if you want  it in words its about 25

just to add the old style must be case earthed and with the words top  at the top. or you get false readings

dont think the electronic ones need earthing as Doug likes his dangling about  !!

Pete

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The chip, 7810, has it's own inbuilt protection. It's a device that was first produced in the late 1970's. I used one then and it's still in a local's Spit today, so very reliable. It's an industry standard voltage regulator chip. Comes in voltages 7805, 7809, 7810, 7812, 7812, 7815 and 7824.  It has a current capacity of 1 amp, above that it will limit and then shut down.

The non chip type that have no protection have a series transistor with a voltage reference zener diode controlling it's base voltage. In other words no protection. If the output lead touches ground then the series transistor burns out. A lot are this type.

Agree with Doug, Read the spec and ensure it has overload protection or just build your own using one of these chips. Only three wires. See the early Spitfire Column in this months Courier, it's a good article.

Both type must have the case earthed.  

Dave

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1 hour ago, dave.vitesse said:

 

Don't do your back in changing it!

Dave  

Too late! Did it in 2005. Disc removed, another wouldn't pass the MOT so now function on Paracetamol, opium & caffeine (under prescription) with liberal doses of alcohol in various guises.

It looks as is the common view is as I thought VS on way out.

No way  am I going to build one, I have enough trouble with LEGO!

I am interested in the electronic replacement that can just hang in there. I'll look at the links quoted in replies but if someone can give an actual part number I would be very grateful.

Time for my medecine, now from which bottle?

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Doug, thanks for the link. Been in contact with him and unit ordered.

Now I will have to practice my limbo dancing to get supple enough to disconnect the old unit & fit new one, delivery from UK usually takes 7 to 10 days so I have time !

Thanks to everyone for your input.

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Chris OK about the back, sorry I didn't know.

Not to sure about the part numbers. The example I have was bought by a local about four years ago from one of the major Triumph spares supplier. It is the unprotected type, now duff, they were using the original Stanpart number to sell it. It is in an original style, metal case, not plastic.

Its advisable they are made in a metal case to dissipate the heat generated by the regulator as this will increase the life of the product. It will work in a plastic case, but don't get it too hot!

Doug's dangle method should keep the plastic type ventilated!

Dave

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1 hour ago, dave.vitesse said:

Chris OK about the back, sorry I didn't know.

Don't worry about it I live with it and life has been adapted to it, I only drink 25 cl beers, no ice in my whisk(e)y to prevent any strain. Bought the Herald rather than a Ferrari as it would have been too low to get in.

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Chris,

just undo the centre console reach in and pull the two wires off the back of the old unit. Leave the old unit where it is! Who knows? Who cares? The wires have one male and one female connector the new unit the same, no room for error. All you need to find is a convenient earthing point. On the back of a gauge?

I prefer the small bottles, my favourite continental beer, Peroni Gran Reserva, has recently moved from small bottles to 50cl, too much for 6.6%.  :wacko:

Doug

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Hi Doug, Yes I am intending to leave the existing unit in place, as you say who cares, as for earthing point, once I have the unit and fit it I'll look around for a suitable and easy to attach point.

"Just undo the centre console reach in and pull the two wires off the back of the old unit". YEA! Laying on my back on the drivers seat body twisted at 270°, arm bent in 3 different directions, fingers at least 20cm long and very thin . . . . I think I'll have a beer.

Know what you mean about the 50cl bottles. Luckily my local artisan brewery has started doing more in 33cl as well as 50cl. Some progress is good.

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1 hour ago, Badwolf said:

Which is the correct voltage stabiliser for a MkIV 1300 Spitfire please. Ebay reference preferred!

Further up in the thread there is a reference to an e bay item - I'm too hot to go looking ?and I'm havinga mug of tea ? I have ordered one for my Herald and the guy selling them has one on his Spit so drop him a line.

I'm not near my proper computer, using one of those touch tablet thingys - you know the make Eye Patch or something like that so can't give proper details.

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Thanks Chris, I missed an entire chunk of postings. Sadly Doug's ebay ref doesn't come up using my 'tablet thingy', will try on the big machine later. Afraid I don't have the electronics skills to identify the correct unit from the spec. Can only manage 'buy this one and connect it here with these leads'! Sad isn't it.

 

UPDATE. Still no joy with Doug's ref no.  Found this one which could be the same unit.  Don't want to get the wrong one and fry anything.  132732212907

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