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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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Joined: Apr 2021
Posts: 159
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Apr 2021
Posts: 159 |
This site is such an amazing resource - I always come away feeling more educated that when I arrive :-)
1974 4/4 2 seater
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Joined: Nov 2015
Posts: 8,678 Likes: 492
Just barreling along Needs to Get Out More!
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Just barreling along Needs to Get Out More!
Joined: Nov 2015
Posts: 8,678 Likes: 492 |
. The technology only worked with a constant reference voltage though, which battery charge systems didn't allow, hence need for 10 volt regulator.
It can be seen if regulation fails an erroneous gauge reading will ensue. Yep, replaced mine with a solid state regulator - gives me much more accurate temp and fuel readings. RegulatorThe chap at Spiyda makes some really useful stuff, very helpful too
Jon M
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Joined: Feb 2019
Posts: 318 Likes: 5
Learner Plates Off!
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Learner Plates Off!
Joined: Feb 2019
Posts: 318 Likes: 5 |
Don't forget that if you are measuring the output of the mechanical voltage regulator it won't read 10V but will chop between 0v and battery voltage (12-14V). The fuel and temperature gauge are heavily damped and take an average. The regulator that TBM mentions is easy enough to install as long as you are the size of a 6 year old child!
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Joined: Nov 2015
Posts: 8,678 Likes: 492
Just barreling along Needs to Get Out More!
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Just barreling along Needs to Get Out More!
Joined: Nov 2015
Posts: 8,678 Likes: 492 |
Don't forget that if you are measuring the output of the mechanical voltage regulator it won't read 10V but will chop between 0v and battery voltage (12-14V). The fuel and temperature gauge are heavily damped and take an average. The regulator that TBM mentions is easy enough to install as long as you are the size of a 6 year old child! Yes, with a modern digital voltage tester they are too sensitive, if you have an old analogue jobbie with a nice old fashioned needle you can almost get a better average reading around 10 volts, but it does flicker a bit, by coincidence been testing one today which suddenly decided to work, I can only assume the coil contacts were a bit grotty from standing over winter
Jon M
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Joined: Feb 2016
Posts: 8,678 Likes: 412
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,678 Likes: 412 |
Don't forget that if you are measuring the output of the mechanical voltage regulator it won't read 10V but will chop between 0v and battery voltage (12-14V). The fuel and temperature gauge are heavily damped and take an average. The regulator that TBM mentions is easy enough to install as long as you are the size of a 6 year old child! There are other solid state regulators which closer mimic OE. ![[Linked Image]](https://i.ebayimg.com/images/g/SykAAOSwxTlZyOrL/s-l1600.jpg)
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Apr 2021
Posts: 159
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Apr 2021
Posts: 159 |
Thanks for the continued advice from everyone - I used a circuit tester and there is definitely power getting to the fuel tank (the led was flickering, so I'm assuming this is what the flickering from 10v to 0v indicates) - would I find the regulator in close proximity to the petrol gauge.
As the gauge does move (albeit, always to 1/3 full) the uneducated me is going to suggest that it's the sender that needs to be replaced
Got my first ever Morgan Car meet-up tomorrow - so excited !
1974 4/4 2 seater
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Joined: Nov 2018
Posts: 6,670 Likes: 436
Talk Morgan Sage
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Talk Morgan Sage
Joined: Nov 2018
Posts: 6,670 Likes: 436 |
Thanks for the continued advice from everyone - I used a circuit tester and there is definitely power getting to the fuel tank (the led was flickering, so I'm assuming this is what the flickering from 10v to 0v indicates) - would I find the regulator in close proximity to the petrol gauge.
As the gauge does move (albeit, always to 1/3 full) the uneducated me is going to suggest that it's the sender that needs to be replaced
Got my first ever Morgan Car meet-up tomorrow - so excited ! My regulator was on the bulkhead, behind the glovebox, passenger side (RHD car).
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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Joined: Feb 2019
Posts: 318 Likes: 5
Learner Plates Off!
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Learner Plates Off!
Joined: Feb 2019
Posts: 318 Likes: 5 |
My regulator ('74 4/4 2 seater) is under the dash pretty much dead centre of the bulkhead. Fixed to the inside upper bolt holding the tool tray to the bulkhead. A multimeter would be a good buy. Tests more than voltage.
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Joined: Feb 2016
Posts: 8,678 Likes: 412
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,678 Likes: 412 |
Thanks for the continued advice from everyone - I used a circuit tester and there is definitely power getting to the fuel tank (the led was flickering, so I'm assuming this is what the flickering from 10v to 0v indicates) - would I find the regulator in close proximity to the petrol gauge.
As the gauge does move (albeit, always to 1/3 full) the uneducated me is going to suggest that it's the sender that needs to be replaced
Got my first ever Morgan Car meet-up tomorrow - so excited ! It's the gauge that requires the regulated 10 volts so it will always be located close by. An old moving coil analogue multimeter is best to assess the output from an OE electro-mechanical regulator.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Apr 2014
Posts: 5,182 Likes: 2
Charter Member
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Charter Member
Joined: Apr 2014
Posts: 5,182 Likes: 2 |
Thanks for the continued advice from everyone - I used a circuit tester and there is definitely power getting to the fuel tank (the led was flickering, so I'm assuming this is what the flickering from 10v to 0v indicates) - would I find the regulator in close proximity to the petrol gauge.
As the gauge does move (albeit, always to 1/3 full) the uneducated me is going to suggest that it's the sender that needs to be replaced
Got my first ever Morgan Car meet-up tomorrow - so excited ! . Dai,. A length of bamboo is a lot more reliable. 
.+8 Now gone for a 1800 4/4. Duratec in bright yellow.
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