This is really more a note for myself. A post that includes details that nobody will be needing unless they have a Morgan 4/4 built between 1982 and 1988 and buy a new loom from AutoSparks in the next couple of month. 🙂
Today I finally got hold of a friendly technician from AutoSparks. He confirmed that their looms is build off from a sample a customer supplied in the past. The year they list of their webpage is not necessarily correct – it says “ca. 1985” for the Ford CVH based version (AutoSpark part number MN78). With this information I am now certain that the sample they had must date to a later model for the Morgan 4/4 with Ford engine. The main difference is the fusebox. Morgan 4/4’s from 1982 to 1988 use the Lucas 7FJ 4-way fusebox. The Autospark loom has 18 connectors – so 9 fuses at least.
After hours of measuring and cross-checking with both the 1984 and 1988 wiring diagrams from GoMog I believe that I am able to fit the harness to my car. The new loom is very close to the 1988 diagram – but without the DimDipModule, fuses for this and the cables. The reason why I believe this is that there is no additional junction/cable that fits the combination of white, brown, red, blue-white and blue-red other than the fusebox. But if the DimDipModule is in the fusebox – there should be a red-green cable coming from the light switch. In the new loom the red cable is coming from the light switch and goes to all 3 light fuses on the left of the diagram. There is no blue-pink and blue-slate cable running to the headlights. Therefore – the loom cannot have a DimDipModule.
The new loom also uses a black-yellow cable going to the radiator fan. In my opinion this is wrong as the BSAU7 code clearly used black-orange for the radiator fan. In my original loom this was the case and can be found in the 1984 diagram. But it look like the error was introduced my the factory as the 1988 diagram notes BY for the fan.
The old loom uses red-yellow for the front fog light. The 1988 diagram introduced a rear fog light (which I don’t even had on my Morgan). The diagram incorrectly says blue-white (UW) – the new loom has blue-yellow (UY – long range driving lamp according to BS-AU7)
On my Morgan there was a single cable running from the alternator to the choke solenoid in the Weber carb. I looked a some pictures of other Morgan 4/4 with Ford CVH and they all seem to have this. It could be an indication that somebody at Pickersleigh Road noticed that the loom they took over from the earlier cars lacked a (BS-AU7: white-blue for choke solenoid) connection from the left to the right inner wing. The 1998 diagram also doesn’t show this – but the new Autosparks loom has exactly this connection. So, despite all the difference something really positive as I don’t might getting rid of a single cable running across the engine like it did before.
The fusebox topic is also a bit of blessing and a curse. The trusty 4-way Lucas box was supplemented by quite a number of additional fuses spread out under the dash and elsewhere in the car. The AutoSpark variant now has 9 fuses in the box. Only instrument light, foglights and auxiliary fuses are still behind the dashboard. It is also interesting that the front fog lights can only be switched on if the rear fog light is on – at least with the current switch cabling. The last fuse is for the radiator fan – awkwardly located in the middle of the left innerwing. So while I still need to find the right type of fusebox for the new loom – it is a somewhat better design.
The side lamp cable as well as the rheostat to dim the instrument lights should be connected via a fuse and a red-black cable. The AutoSpark loom lacks red-black for this – instead all red cables are connected. I need to sort this out. The rear loom has a white-purple cable (fuel-pump) but it is missing the the main loom. Not a big problem – I will add an Inertia switch and a connection to the fusebox for this.
Last thing I figured out today was the position and cabling for the Starter relay. On my car this was exchanged with (2!) Bosch units. Only mounted under dashboard – one screwed to the side of the heaterbox on the bulkhead. The wiring was completely strange and unfortunately the pictures I took are not good enough to follow all connections. But this doesn’t matter anyhow. The new loom has a white-black cable running from the coil to tachometer. In the 1984 diagram the tacho was connected via a green cable from the fusebox – a direct connection to the coil should give the most accurate rpm readings. I think I will add the required white-blue cable for the relay
A brown, white-red cable come for the ignition. As the 1988 diagram only shows a relay for the Morgan +8 the cabling is different there – I believe I should be fine.
Great – I now fully understand the new loom and its quirks. In addition I have also found pretty much all problems with the old loom. Next task is to get it into the car. Well, no. Before I do this I will do some changes. Instead of hooking up cables to switched and gauges on the dashboard directly I will add a couple for EconoSeal 13way connectors. I have ordered 5m cable of every single BS-AU7 color needed behind the dashboard. Furthermore I will also add the cables required for the EZPowerSteering, the added heated seats and the Brantz Rallyemeter. As delievery of these items will take some time – my next focus will be the dashboard itself.
Fixing C6622 
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