Click here to return to the home page.
Image of a road.
Who's Online Now
5 members (TalkMorgan, Bunny, Rog G, truckin-on, mph), 295 guests, and 40 robots.
Key: Admin, Global Mod, Mod
Top Posters(30 Days)
John V6 68
DaveW 64
+8Rich 61
Newest Members
4199, GOFFO1965, Joske Vermeule, SBP17, Ulfulf
9,208 Registered Users
Newest Topics
Plus 4 4-seater with laudable MOT result
by Soleng - 24/07/25 05:32 PM
MulFab and Petrol Tanks
by Rovert - 24/07/25 09:51 AM
For Sale - `librands double buckle bonnet strap
by DavidPoole - 23/07/25 06:38 PM
Maybe an MX5
by howard - 23/07/25 04:10 PM
Dashboard Turn Signal Light
by Bob_Price - 23/07/25 03:37 PM
Ozzy Osbourne
by Burgundymog - 22/07/25 08:28 PM
FREE - Roadster 100 book by Frank W. Lamaz
by DavidPoole - 22/07/25 07:12 PM
Latest Photos
Motorworld München
Motorworld München
by Oskar, July 20
visit to Classic Remise Düsseldorf
my book
my book
by Oskar, July 20
More Pictures of the MHR Visit
More Pictures of the MHR Visit
by DaveK, July 19
Visit to the Factory- Historic Morgan Group
Forum Statistics
Forums34
Topics48,347
Posts813,073
Members9,208
Most Online1,046
Aug 24th, 2023
Today's Birthdays
Captain Morgan, IRWIN
Previous Thread
Next Thread
Print Thread
Page 2 of 2 1 2
Gambalunga #327754 24/12/15 07:54 AM
Joined: Aug 2013
Posts: 15,794
Likes: 14
Formerly known as Aldermog
Member of the Inner Circle
Offline
Formerly known as Aldermog
Member of the Inner Circle
Joined: Aug 2013
Posts: 15,794
Likes: 14
Peter,

the issue you describe is a "school boy" error!

I was taught at school that NOTHING goes between an electronic component and ground/earth. All switches, controls and other stuff must go on the live side of a component.

Why? Because if the switch is on the wrong side then the component is never properly off and there is a risk of both overheating and electric shock. Also, as you describe, a motor is also a generator and back emf can do all sorts of strange things.

OK, on a car electric shock isn't a serious issue, but even so...

Yes, re-wire it.

PS: on the +8 the electrics/electronics are mostly BMW. I hope/suspect they do it correctly.

Peter


Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...

Mike Carter #327760 24/12/15 08:26 AM
Joined: Jul 2007
Posts: 26,748
Likes: 419
Member of the Inner Circle
Offline
Member of the Inner Circle
Joined: Jul 2007
Posts: 26,748
Likes: 419
There a re 4 screws on my 2006 car holding the dash on. Two at the side & 2 in the middle over the instrument switch panel.

Take photos as you open it. On mine the wires pull of the pcb.

It seems scary but is actually easy to do. While you are there I would change the Morgan cheap washer pipe & T piece. Tie wrap the pipes on. Mine failed & it then sprays the electrics. Mini (old style)bits fit.


JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger
Mike Carter #328182 26/12/15 02:49 PM
Joined: Nov 2015
Posts: 1
A
New to Talk Morgan
Offline
New to Talk Morgan
A
Joined: Nov 2015
Posts: 1
I have just had a car in which has also had 3 circuit boards. After hours of investigating [i][/i]we have come to the conclusion that the circuit board is poorly designed and simply not up to the job, not helped by some poor wiring circuitry that can cause back feeds.

We have designed a new board that converts everything back to relays and keeps the 2 stage illumination of the dash mounted switches (for on and off) this is pretty much guaranteed to solve all problems permanently and is done as a plug in conversion so that should you ever need to it can be converted back to original.

We intend to offer these fitted to any customers who are interested, please easy for more details.

Andy

Last edited by Andy47; 26/12/15 02:50 PM.
Andy47 #328232 26/12/15 07:22 PM
Joined: Sep 2011
Posts: 14,723
Likes: 149
Member of the Inner Circle
Offline
Member of the Inner Circle
Joined: Sep 2011
Posts: 14,723
Likes: 149
I would be interested to know a little more Andy. I certainly agree with you that the circuit board is poorly designed and has little or no protection from feedbacks and voltage pulses.

I would be particularly interested to know if the logic of the control of the two speed heater fan has been reversed so that the control is on the power supply side, not on the earth side.

You could send me a PM with your contact details if you wish.


Peter

[Linked Image]
Mike Carter #329619 02/01/16 11:13 AM
Joined: Jan 2011
Posts: 112
T
L - Learner Plates On
Offline
L - Learner Plates On
T
Joined: Jan 2011
Posts: 112
"on the +8 the electrics/electronics are mostly BMW. I hope/suspect they do it correctly"

When I bought my (older) Plus 8 I was also running a BMW 740i. Comparing wiring on the two cars was an education.

I find it difficult to understand how the two approaches could differ so much, the BMW electrics resembling an aerospace installation and the Morgan more like some schoolboy practical experiment.

Andy47 #329667 02/01/16 02:36 PM
Joined: Sep 2011
Posts: 14,723
Likes: 149
Member of the Inner Circle
Offline
Member of the Inner Circle
Joined: Sep 2011
Posts: 14,723
Likes: 149
I PMed Andy and have had no reply. He seems to have come and gone in the flash of a printed circuit board and a puff of smoke.


Peter

[Linked Image]
Page 2 of 2 1 2

Moderated by  TalkMorgan 

Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5