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Re: Fuel Gauge, Wow and Thank you [Re: RobFog] #732784
09/02/22 05:45 AM
09/02/22 05:45 AM
Joined: Apr 2021
Posts: 138
San Francisco
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RobFog Offline OP
L - Learner Plates On
RobFog  Offline OP
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R

Joined: Apr 2021
Posts: 138
San Francisco
This site is such an amazing resource - I always come away feeling more educated that when I arrive :-)


1974 4/4 2 seater
Re: Fuel Gauge, Wow and Thank you [Re: TBM] #732812
09/02/22 11:14 AM
09/02/22 11:14 AM
Joined: Nov 2015
Posts: 4,863
Northern Capital of Cool
CooperMan Offline
Just barreling along
CooperMan  Offline
Just barreling along
Part of the Furniture

Joined: Nov 2015
Posts: 4,863
Northern Capital of Cool
Originally Posted by TBM
Originally Posted by RichardV6
. 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. Regulator


The chap at Spiyda makes some really useful stuff, very helpful too


Jon M
Re: Fuel Gauge, Wow and Thank you [Re: RobFog] #732835
09/02/22 03:12 PM
09/02/22 03:12 PM
Joined: Feb 2019
Posts: 266
Norfolk
T
thelastgizmo Offline
Learner Plates Off!
thelastgizmo  Offline
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Joined: Feb 2019
Posts: 266
Norfolk
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!

Re: Fuel Gauge, Wow and Thank you [Re: thelastgizmo] #732866
09/02/22 07:28 PM
09/02/22 07:28 PM
Joined: Nov 2015
Posts: 4,863
Northern Capital of Cool
CooperMan Offline
Just barreling along
CooperMan  Offline
Just barreling along
Part of the Furniture

Joined: Nov 2015
Posts: 4,863
Northern Capital of Cool
Originally Posted by thelastgizmo
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
Re: Fuel Gauge, Wow and Thank you [Re: thelastgizmo] #732880
09/02/22 09:30 PM
09/02/22 09:30 PM
Joined: Feb 2016
Posts: 4,902
East Harling, Norfolk UK
RichardV6 Offline
Part of the Furniture
RichardV6  Offline
Part of the Furniture

Joined: Feb 2016
Posts: 4,902
East Harling, Norfolk UK
Originally Posted by thelastgizmo
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]


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1945 Moto Guzzi Airone
Re: Fuel Gauge, Wow and Thank you [Re: RobFog] #733017
11/02/22 08:28 PM
11/02/22 08:28 PM
Joined: Apr 2021
Posts: 138
San Francisco
R
RobFog Offline OP
L - Learner Plates On
RobFog  Offline OP
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Joined: Apr 2021
Posts: 138
San Francisco
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
Re: Fuel Gauge, Wow and Thank you [Re: RobFog] #733018
11/02/22 08:40 PM
11/02/22 08:40 PM
Joined: Nov 2018
Posts: 4,382
Northants, UK
TBM Offline
Part of the Furniture
TBM  Offline
Part of the Furniture

Joined: Nov 2018
Posts: 4,382
Northants, UK
Originally Posted by DaiBach
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).


1972 4/4 4 seater - 3G Morganeer
Too many ratty motorbikes
Re: Fuel Gauge, Wow and Thank you [Re: RobFog] #733041
12/02/22 11:45 AM
12/02/22 11:45 AM
Joined: Feb 2019
Posts: 266
Norfolk
T
thelastgizmo Offline
Learner Plates Off!
thelastgizmo  Offline
Learner Plates Off!
T

Joined: Feb 2019
Posts: 266
Norfolk
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.

Re: Fuel Gauge, Wow and Thank you [Re: RobFog] #733045
12/02/22 12:16 PM
12/02/22 12:16 PM
Joined: Feb 2016
Posts: 4,902
East Harling, Norfolk UK
RichardV6 Offline
Part of the Furniture
RichardV6  Offline
Part of the Furniture

Joined: Feb 2016
Posts: 4,902
East Harling, Norfolk UK
Originally Posted by DaiBach
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 - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1945 Moto Guzzi Airone
Re: Fuel Gauge, Wow and Thank you [Re: RobFog] #733049
12/02/22 01:20 PM
12/02/22 01:20 PM
Joined: Apr 2014
Posts: 5,121
Llanelli
Ray Offline
Charter Member
Ray  Offline
Charter Member

Joined: Apr 2014
Posts: 5,121
Llanelli
Originally Posted by DaiBach
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.
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.+8 Now gone for a 1800 4/4. Duratec in bright yellow.
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