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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: May 2012
Posts: 1,796 Likes: 5
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: May 2012
Posts: 1,796 Likes: 5 |
It looks under the dash to me, standard motorsport battery isolator. Remove the red key to isolate.
Neat job, looks like factory fit.
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Joined: Jul 2013
Posts: 3,732 Likes: 79
Talk Morgan Addict
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Talk Morgan Addict
Joined: Jul 2013
Posts: 3,732 Likes: 79 |
Interestingly I had to boost my Lithium battery after a few weeks. It claimed a charge but not enough to turn the engine over... maybe the wet sumping added too much load? Paralleling my old (and by itself defunct in terms of M3W starting) Banner (technically only 2yrs old, but swapped out last year) got it started.
Possibly I have an "electrical leak" somewhere. Only outstanding electrical issue is that the heated seats havent worked since I put the insides back together again last year... probably I should pull the fuse! If it was cold, ie below about 5c then lithium batteries need to get warmed up first. Leave the headlights on for about a minute and prime the fuel two or three times. The starter may still churn for 20 -30 seconds before anything fires but it will get there. If the engine has significant wet sumping then you'll need to drain some oil from the engine and put it back in the tank then all should be OK.
Red Leader 
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Joined: Feb 2018
Posts: 807 Likes: 38
Talk Morgan Regular
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Talk Morgan Regular
Joined: Feb 2018
Posts: 807 Likes: 38 |
As a matter of interest, with your skills why did you not fit the isolator key under the dashboard rather than having to take the hood off every time? As Dab of Oppo observed, it is under the dash, near the steering column. Easily accessed when standing beside the car, or when sitting in the drivers seat. But pretty much invisible to the casual observer, especially when off or with the key removed. BTW- my bonnet is center hinged, so getting underneath it would not be a chore at all.
Last edited by Bitsobrits; 24/02/21 07:02 PM.
Steve
Late 2012 M3W
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Joined: Jul 2018
Posts: 1,031 Likes: 2
Has a lot to Say!
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Has a lot to Say!
Joined: Jul 2018
Posts: 1,031 Likes: 2 |
Sorry - of course it is. Old age.
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Joined: May 2019
Posts: 592
Talk Morgan Regular
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Talk Morgan Regular
Joined: May 2019
Posts: 592 |
I use a Varta 53030 30ah. It fits and has the same terminals as the Banner and does a good job but I do keep it on a conditioner when the car is in the garage.
M3W Brooklands (2015)
Moody 41 (2013)
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Joined: Nov 2013
Posts: 1,947
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Nov 2013
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Wilson how are you getting to France? You cannot take Lithium batteries through the tunnel unless fitted to a vehicle. Probably OK on a ferry but best check?
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Joined: Feb 2019
Posts: 3,857 Likes: 2
Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
Posts: 3,857 Likes: 2 |
As a matter of interest, with your skills why did you not fit the isolator key under the dashboard rather than having to take the hood off every time? As Dab of Oppo observed, it is under the dash, near the steering column. Easily accessed when standing beside the car, or when sitting in the drivers seat. But pretty much invisible to the casual observer, especially when off or with the key removed. BTW- my bonnet is center hinged, so getting underneath it would not be a chore at all. Thanks Steve, that switch install is exactly what i had in mind. And i would it if you could post photos of your split bonnet and how you did it. Do you have a link?
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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Joined: May 2015
Posts: 1,815 Likes: 32
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: May 2015
Posts: 1,815 Likes: 32 |
Interestingly I had to boost my Lithium battery after a few weeks. It claimed a charge but not enough to turn the engine over... maybe the wet sumping added too much load? Paralleling my old (and by itself defunct in terms of M3W starting) Banner (technically only 2yrs old, but swapped out last year) got it started.... If it was cold, ie below about 5c then lithium batteries need to get warmed up first. Leave the headlights on for about a minute and prime the fuel two or three times. The starter may still churn for 20 -30 seconds before anything fires but it will get there. If the engine has significant wet sumping then you'll need to drain some oil from the engine and put it back in the tank then all should be OK. Good tips Chris. Will try the headlight tip next time it happens (next Winter?). Never been able to drain much oil from the sump, and 8 secs max gets it firing after a spell of inactivity. Thinking I might tackle the heated seat switches from underneath if there is room (mine has no plate under the propshaft, and I suspect road spray could have shorted the connections as I did not reapply the original generous covering of duct tape over the wiring!!!).
M3W5sp 2015, MSCC, MTWC, Oxon UK
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Joined: Feb 2019
Posts: 3,857 Likes: 2
Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
Posts: 3,857 Likes: 2 |
PaulIV,
My heated seat connector that takes the switch wires and connects them to the fuse panel area is under the fuse panel close to the battery. Darn hard to access.
Last edited by LightSpeed; 27/02/21 01:37 PM.
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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