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New
by Rex_tulips - 30/07/25 07:59 PM
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Forums34
Topics48,365
Posts813,387
Members9,215
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Most Online1,046
Aug 24th, 2023
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Joined: Feb 2017
Posts: 4
New to Talk Morgan
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New to Talk Morgan
Joined: Feb 2017
Posts: 4 |
Rog, I think you've solved my problem. At idle I'm showing in the mid-12's, and while running it maxes out about 13.4. I'll double check tomorrow morning, as it's about 98 degrees right now in the DC area.
Thanks so very much.
Paul
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Joined: Feb 2017
Posts: 4
New to Talk Morgan
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New to Talk Morgan
Joined: Feb 2017
Posts: 4 |
My voltage running is 13.4, very briefly hit 13.5. Thanks for solving my problem.
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Joined: Feb 2016
Posts: 7,944 Likes: 218
Talk Morgan Guru
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Talk Morgan Guru
Joined: Feb 2016
Posts: 7,944 Likes: 218 |
My voltage running is 13.4, very briefly hit 13.5. Thanks for solving my problem. It won't be solved until you see close to 14.4 volts when driving. Check regulator connections, particularly the earth, and if no improvement change reg. Its possible that one of the three phase output's is down due to blown rectifier which would explain your symptoms. Showing 13.4 volts suggests some charge current, but a full volt down on what it should be with fully charged battery.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Apr 2013
Posts: 1,363 Likes: 11
Has a lot to Say!
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Has a lot to Say!
Joined: Apr 2013
Posts: 1,363 Likes: 11 |
With the Diehard battery and the H-D rectifier I am running a solid 14.4 volts at speed. I use the JW Speaker LED headlamps and with them on at speed I get 14.3 volts. I double checked with my ammeter for confirmation and everything is dead on.
What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.
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Joined: Jan 2013
Posts: 655 Likes: 1
WW11 MOG Talk Morgan Regular
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WW11 MOG Talk Morgan Regular
Joined: Jan 2013
Posts: 655 Likes: 1 |
My JMT battery has arrived and is fitted. My M3W now starts better than it ever has  As the JMT battery is unbelievably light I decided to fix it in position with cable ties, rather than the steel strap. I also removed the charging cable for my Carcoon and put all these parts into the box the battery came in for safe keeping. You know what, the battery box now feels about the same weight as it did when it arrived with the battery in it!! A replacement Banner would have cost £70. The JMT cost slightly over £190. The JMT is more powerful and the benefit weight saving can only help on the hillclimbs and race circuits  Well worth the extra £120 for me!
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Joined: Mar 2015
Posts: 902
Talk Morgan Regular
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Talk Morgan Regular
Joined: Mar 2015
Posts: 902 |
Is it a direct swap or do you have to shave anything off the battery?
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Joined: Jan 2013
Posts: 655 Likes: 1
WW11 MOG Talk Morgan Regular
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WW11 MOG Talk Morgan Regular
Joined: Jan 2013
Posts: 655 Likes: 1 |
Slightly smaller than the original
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Joined: Mar 2015
Posts: 902
Talk Morgan Regular
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Talk Morgan Regular
Joined: Mar 2015
Posts: 902 |
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Joined: Feb 2017
Posts: 4
New to Talk Morgan
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New to Talk Morgan
Joined: Feb 2017
Posts: 4 |
Rog, I think you've solved my problem. At idle I'm showing in the mid-12's, and while running it maxes out about 13.4. I'll double check tomorrow morning, as it's about 98 degrees right now in the DC area.
Thanks so very much.
Paul
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Joined: Sep 2013
Posts: 25
Just Getting Started
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Just Getting Started
Joined: Sep 2013
Posts: 25 |
Anything special about changing the battery? My dealer when I bought it said not to do it myself as there might be some problem starting it after you do. 2013 model.
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