I’ve got a 1989 defender which I am rebuilding. The wiring is a complete mess (scotch clips, connector blocks and spade connections everywhere), due to previous owners. I think it originally had a 19j engine (has the old glass fuses) and a 300 has been bodged into it.

funds are starting to run low so a new bulkhead wiring loom is going to cost too much. I have seen a few decent 200tdi bulkhead looms for sale.

so my question is, how much modification is required to fit a 300tdi engine to a 200tdi bulkhead loom

I can’t seem to find any threads on this.

TIA

I did this recently and bought a used 300tdi engine/bulkhead/fusebox loom from Synetic (eBay) ...
New/used column switches, ignition switch and binnacle followed as well as a front to back loom, rear door wiring and instrument harness.
Underbonnet fuse box and hand made bracket too (my bulkhead didn't have one).

Out came the old glass fuses and in went the correct wireing.

Now I have a 300tdi with intermittent windscreen wipers, aux power, timed heater plugs, rear wiper/heated window etc etc...
Not sure of the total cost, over a grand for sure, possibly closer to 1500

I had the similar problem, 200TDI into my old 19J. I decided to renew the fuse box first replacing the glass fuses with blade type found here https://www.autoelectricsupplies.co.uk/mobile/product/311/category/63. After replacing some wiring in and around the fuse box I carried on into the engine bay and eventually fixed all the bodges etc with new wire and proper connections. At least you would know intimately your landy electrics. Cost me around £35 all in

Rich

@gil, if funds are low simply replace bodged wires with new + as above fuse box with std blade fuses/fusebox. In addition the AES, there's CarBuilderSolutions and VehicleWiringProducts. All three Co's are equally good.

Re' funds, Land Rovers do eat more continual/regular funds than other/historic cars so be prepared to put away £1000+ min for a rainy day fund...this way ownership becomes less painful. And if possible, only buy grade G parts...not the el cheapo's...as you'll be having to buy again in six months time.