Welcoming your suggestions for, and leads on, the replacement of the (female) connector/socket on the wiring harness/loom where the four pin relays plug into. Seems that the spades in the factory connector/socket have become somewhat loose/widened over time, resulting in bad connections, overheating and eventually slight melting of the plastic connector/socket they are housed in (and eventually frequent failures and overall power losses). Trust that it comes as no surprise, that the factory makes available the wiring harness/loom in its entirety (rather than the odd connector/socket). For the record, all the wiring harnesses/looms for the entire Tamburini model range were made by La Punta S.r.l., an Italian manufacturer specialising in automotive cables still trading to this very day (purportedly founded in the early eighties by Enzo Ferrari and his long-time friend Giuseppe Neri (former owner of the company)). It appears that side-facing micro sockets to house for these four pin relays are hard to come across these days (up-facing micro sockets to house 4/5 pin relays are still available), even in certain specialist hardware stores (whilst the relays are still very much in use in many modern models).
If you can’t find a socket you could use spade terminals to connect the relay and then use epoxy putty or similar to encapsulate them, keeping the terminus in their correct relative places.
https://www.ebay.co.uk/itm/204472111268 The connectors are really just spade connectors within the socket - you can also carefully extract them and squeeze them with a pair of pliers to tighten up the mounting.
Thank you all for your very much workable solutions. For those interested in maintaining originality, I have just been advised that these (female) connectors/sockets are still sold by their US manufacturer, being TE Connectivity AMP Connectors, as micro relay socket 1-1904045-6. Reportedly they were once produced by TE Connectivity and sold exclusively to Bosch in Europe for its micro relays, but it appears that the contract for the connectors has been dropped for some time as Bosch produces the micro relays in limited lots these days just to support this particular (discontinued) relay line.
These female spade connectors would do the job https://www.ebay.co.uk/itm/13186937...gyq9EtCRF2&var=&widget_ver=artemis&media=COPY
... and this is what you get from Ducati these days when ordering a replacement for your factory four pin relay for your factory five pin connector socket: a five (5) pin relay (top two pins measuring 6.3 mm whilst the bottom three 4.8 mm).
Any good? You'd need to find the terminals as well... https://www.12voltplanet.co.uk/micro-relay-socket.html That's for this relay I reckon: https://www.12voltplanet.co.uk/micr...ally-open-no-contacts-12v-30a-with-diode.html Edit: Ah crap - just seen that the OP is in Greece!
Thanks @Keith_P. I came across that (up-facing) connector/socket in a number of vendors yet, with a closer inspection, it doesn't fit (both in terms of size as well as design) in the rubber relay housing under the battery tray (and purist me would like to avoid bespoke solutions in as much as possible). Also the micro relay socket would need to be side-facing (again due to the peculiarities of the rubber relay housing). As for the four pin relay itself, I am somewhat puzzled as to why Ducati supplied a five pin relay under this part code (when evidently four pin micro relays are still very much out there).
Mouser is expressly mentioned on the website of the US manufacturer of this micro relay socket, being TE Connectivity AMP Connectors, as one of two authorised resellers of its products on this side of the pond.
Despite it being a discontinued component they are shown as over 6000 in stock. Terminals can be sourced from @Keith_P link https://www.mouser.co.uk/ProductDet...T*MTcwMDUwMTY1Ni4xLjAuMTcwMDUwMTY1Ni42MC4wLjA
Try digikey as they have a US presence and their shipping is not prohibitive https://www.digikey.com/en/products...y-potter-brumfield-relays/1-1904045-6/5437927 If you are struggling for connectors then PM me and I will source/ship them to you.