Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) Dash Switches - PCB Protection 2003-2007 Morgans

Rog, where would be the best place to wire the extra fuse, would it be for each indicator side before it enters the PCB?

Many thanks
Will

Fantastic

Some later cars had a little supplementary plug-in loom behind the dash with a couple of fuses incorporated. I have a dim recollection that the loom could be purchased from Morgan as an add on. I may be completely wrong but might be worth giving Mr Rutter a call?

Failing that it wouldn’t be that difficult to add a couple of 5A fuses on the N/S and O/S indicator supply wires exiting the PCB.

Wires GR90 and GW86 on pins 5 and 9 of the 12 way Dashboard PCB connector




And as always, the caveat.... Go careful modifying your car. Check everything for yourself. Don’t take my word for anything, I have no electrical credentials.


PS – there’s a nice little video by Dave showing the loom on this page

I can see why adding a fuse into the supply to the indicators would help protect the PCB in the event of indicator failure/short, but why stick them up behind the dash where you can't get to them is they blow? Surely they'd be better further down the loom in a more accessible location?

Probably it was the same person that decided to stick the relays behind the dash

You could always put a fuse on each corner...

The Plus8 I had was fun for a couple of electrical gremlins. Rear foglight was flashing in daylight with no lights selected. Got the wiring dagram out after checks on the bulb and unit showed all looked ok. Traced back to a module behind the dash that cancelled the light when dip front mains switched off. The reset required to comply with regs. Opened it up as it rattled. The pcb was loose so glued back. Problem resurfaced a few months later. PCB still glued ok. Phoned Melvyn for a replacement.Factory order, no news, none in factory for the later cars. Checked the pcb under magnification, spotted a couple of not perfect solder joints. Quick dab with a soldering iron and no further problems. My fall-back was to buy a unit from Carbuildersolutions as a replacement.
Bullet connectors for headlamp wiring...no protection under the wing so they corroded badly and gave problems. Solid.cut them out and remade connections with added protection for new non bullet connections.
Move to the current ( no pun intended) 2023 Plus Four.....gauges failed after a few months. Sorted at dealer with a new pcb under warranty. The cause was a badly fitting connector to the pcb resulting in a wire failure. An assembly fault so the connection was compromised. Dealer got the new pcb from MMC next day and fitted. I was dreading a delay but pleasantly surprised at the speed.
Looking at the age of so many Morgans I'm not surprised that electrics give issues. A combination of design/assembly/age deterioration catches up. How long before system checking and overhaul becomes prudent?

Brilliant Rog

Fortunately dropping the dash is a quick and easy job. When my main ECU relay failed out in Spa 3 years ago, I had the dash down, the relay changed, and the dash back up in 35 minutes flat.

Also, for what it's worth the late model PCB I harvested of a crashed 2016 4/4, remains reliable (so far), it came with the supplementary fly loom and fuses fitted so while these don't improve reliability as such, at least they offer a bit more protection for some of the delicate tracks on the board.

Mot failed due to one washer not working when tester tried it! Went home removed the bottle and was shocked to see the crud inside the bottle and tubing. Once that was done headed back for MOT pass, But soon realised there was water on top of gearbox tunnel and that suggest a leak on the tubing under the dash. So thanks to all of you I now know what to do!,,

Interesting revelation sospan that the CX Plus Four has a PCB involving the gauges. Would you happen to know if this is a MMC addition or an integral part of the instruments.

Dropped the dash following all the previous instructions and found there was a leak in the black tubing. I had nought a supply of neoprene but the diameter is wider, so need some mods. A previous owner had been in there and used string and superglue to attach the tubing to the t piece! That meant me damaging the plastic so off to buy a replacement. But here is an odd thing - behind the dash near the reostat for the instrument lighting I found a male and female spade connector, a bulb holder and attached to that a bulb! What would that have been for? I will use wire to attach the tubing to the t piece. And at same time work out a protector for the PCB using a plastic document wallet.