Modern Vespa

Is it possible to compare these wiring diagrams and figure out if the voltage regulators are interchangeable?

Please give the link for the KC155 diagram - it's very blurry in your post and indecipherable.

Here they are

https://kaele.com/~kashima/car/smax/XC155_1DK_Wireing_Diagram.pdf

https://servicemanualwarehouse.com/yamaha-2018-smax-service-manual/

Those two regulators do the same job, with similar wiring but who knows about fitted connectors.

If I had one for one bike I'd certainly take a punt at fitting it to the other.

Without having them side to side, and tested in the swap, I'd not sell one to a customer for this.

Thank you,
It's for me. Both are 5 pin, and the compatibility chart for an aftermarket part lists the GT200, and a bunch of older Yammies, but not the Smax. Yamaha is on backorder and I need one by the middle of June for a longish ride.

Here's a cross reference chart for Vespa voltage regulator 58090R.

APRILIA, BENELLI, DERBI, GILERA, MALAGUTI, MBK, PEUGEOT, PIAGGIO, YAMAHA

Model: ADIVA 125 01-02, ADIVA 150 01-02, APE 50 09=> (DAL 29/03/11), APE 50 2T EU4 18-21, APE 50 da 07/11 ->, ATLANTIC 125 03-05, ATLANTIC 125 EU3 -06, ATLANTIC 125 EU3 -07, ATLANTIC 125 EU3 -08, ATLANTIC 125 EU3 -10, ATLANTIC 125 EU3 -11, ATLANTIC 125 EU3 -12, ATLANTIC 200 03-05, ATLANTIC 250 03-05, BEVERLY 125 -01, BEVERLY 125 -02, BEVERLY 125 -03, BEVERLY 125 EU3 -07, BEVERLY 125 EU3 -08, BEVERLY 125 MIC EU3 -07, BEVERLY 125 RST -04, BEVERLY 125 RST -05, BEVERLY 125 RST -06, BEVERLY 125 RST -07, BEVERLY 125 SPORT EU3 -07, BEVERLY 125 SPORT EU3 -08, BEVERLY 125 TOURER EU3 -08, BEVERLY 125 TOURER EU3 -09, BEVERLY 125 TOURER EU3 -10, BEVERLY 200 01-03, BEVERLY 250 -06, BEVERLY 250 -07, BEVERLY 250 RST -04, BEVERLY 250 RST -05, BOULEVARD 125 02-04, BOULEVARD 125 4T EU3 08-12, BOULEVARD 125 EU2 04-07, BOULEVARD 150 02-04, BOULEVARD 150 4T EU3 -10, BOULEVARD 150 EU2 04-07, BOULEVARD 200 EU2 05-06, CARNABY 125 07-10, CARNABY 200 07-08, DNA 125 -01, DNA 180 -01, ELYSTAR 50 TSDI 03=>, FLY 125 05-07, FLY 125 EU3 07-11, FLY 150 05-07, FLY 150 EU3 08-11, GP1 125 EU2 -06, GP1 125 LOW SEAT EU3 07-08, GP1 250 06-07, GPR 125 4T 09-10, HEXAGON 125 GTX -00, HEXAGON 180 GTX -00, JET FORCE 50 03=>, LIBERTY 125 -01, LIBERTY 125 -02, LIBERTY 125 4T -06, LIBERTY 125 4T -07, LIBERTY 125 4T 2V EU3 09-12, LIBERTY 125 4T 3V IE IGET 15-19, LIBERTY 125 4T EU3 07-08, LIBERTY 125 4T EU3 DELIVERY-SINGLE 07-15, LIBERTY 125 4T EU3 DELIVERY-TNT 08-15, LIBERTY 125 4T IGET CORPORATE EU4 17-19, LIBERTY 125 4T SPORT EU3 06-08, LIBERTY 125 RST -04, LIBERTY 125 RST -05, LIBERTY 125 RST PTT 05-11, LIBERTY 125 SPORT -06, LIBERTY 150 -01, LIBERTY 150 -02, LIBERTY 150 4T 3V IGET 15-19, LIBERTY 150 4T 3V LEM -14 (DAL 01/04/14), LIBERTY 150 4T EU3 -08, LIBERTY 150 4T EU3 MOC 09-13, LIBERTY 150 4T SPORT EU3 -08, LIBERTY 200 -06, LIBERTY 200 4T EU3 06-08, LIBERTY 200 4T SPORT EU3 06-07, LIBERTY 200 RST -04, LIBERTY 200 SPORT -06, LIBERTY 50 4T 3V IGET 15-17, LIBERTY 50 4T 3V IGET 25 KM/H -16, LOOXOR 50 TDSI -02, MADISON 180 R 01-02, MADISON 200 S RESTYLING -02, MADISON 200 S RESTYLING EU2 -03, MADISON 250 RS RESTYLING -04, MADISON 250 S 99-01 MOT. YAMAHA, MADISON 3 125 06-09, MOJITO 125 -03, MOJITO 125 -04, MOJITO 125 -05, MOJITO 125 -06, MOJITO 125 -07, MOJITO 125 -08, MOJITO 150 CUSTOM 03-04, MP3 125 06-08, MULHACEN 125 4T EU3 07-10, MXV 450 08-11, NEXUS 125 EU3 07-08, NRG 50 POWER PUREJET 04-11, NRG 50 PUREJET -10, OREGON 250 06-10, PHANTOM MAX 200 -03, PHANTOM MAX 250 -04, RAMBLA 125 08-09, RAMBLA 125 EU3 2EVER -08, RS 125 ABS 17-18, RS 125 REPLICA 4T EU4 ABS -19, RS 125 REPLICA ABS 17-18, RS4 125 11-15, RS4 125 REPLICA 14-16, RUNNER 125 4T ST EU3 08-16, RUNNER 125 VX 00-06, RUNNER 125 VX 4T EU3 06-07, RUNNER 125 VX RACE -06, RUNNER 125 VX SC 06-07, RUNNER 180 VXR 00-01, RUNNER 200 VXR 02-04, RUNNER 200 VXR 05-06, RUNNER 200 VXR 4T ST EU3 08-11, RUNNER 200 VXR EU3 -07, RUNNER 200 VXR RACE 05-06, RUNNER 50 PUREJET 02-11, RUNNER 50 PUREJET ST -08, RX 125 EU4 18-20, SCARABEO 125 03-06, SCARABEO 125 EU3 -06, SCARABEO 200 ( MOTORE PIAGGIO ) -03, SCARABEO 200 EU3 -06, SCARABEO 250 04-06, SCARABEO LIGHT 125 07-08, SCARABEO LIGHT 200 07-08, SENDA 125 DRD MOTARD -13, SENDA 125 R-SM DRD RACING 4T -09, SKIPPER 125 4T 00-02, SKIPPER 150 4T 00-02, SONAR 125 4T 09-11, SONAR 150 4T -09, SPORT CITY 125 04-06, SPORT CITY 125 EU3 06-08, SPORT CITY 200 04-06, SPORT CITY 200 EU3 06-07, SPORT CITY CUBE 125 08-10, SPORT CITY CUBE 200 08-10, SPORT CITY ONE 125 4T EU3 08-11, SPORT CITY STREET 125 -12, SR 125 MOTARD 12-14, SR 50 R FACTORY IE 04-14, SR 50 R IE 04-09, SR 50 STREET IE 03-12, SUPER HEXAGON 125 GTX 12" 01-02, SUPER HEXAGON 180 GTX 12" 01-02, SX 125 EU4 18-20, TERRA 125 4T EU3 07-09, TERRA 125 4T EU3 ADVENTURE 07-09, TUONO 125 ABS 17-18, TUONO 125 EU4 ABS -20, TYPHOON 125 4T 2V EU3 10-11, VARIANT 125 SPORT 4T EU3 -12, VELVET 400 03-04, VESPA 125 GRANTURISMO 03-07, VESPA 125 GRANTURISMO EU3 06-07, VESPA 125 PRIMAVERA 4T 3V IGET ABS 16-20, VESPA 125 SPRINT 4T 3V IE 14-15, VESPA 125 SPRINT 4T 3V IGET ABS 16-20, VESPA 150 PRIMAVERA 4T 3V 13-16, VESPA 150 PRIMAVERA 4T 3V IGET ABS 16-20, VESPA 150 SPRINT 4T 3V IE -15, VESPA 150 SPRINT SPORT 4T 3V IGET 16-19, VESPA 200 GRANTURISMO 03-07, VESPA ET4 125 99-03, VESPA ET4 150 99-03, VESPA GTS 125 EU3 07-12, VESPA GTV 125 06-08, VESPA GTV 125 4T NAVY EU3 -08, VESPA LX 125 05-06, VESPA LX 125 4T FL -09, VESPA LX 125 EU3 06-08, VESPA LX 125 PRIMAVERA 4T 3V IE 13-17, VESPA LX 150 05-06, VESPA LX 150 4T 3V IE - TOURING 12-13, VESPA LX 150 4T FL -09, VESPA LX 150 EU3 06-08, VESPA LXV 125 4T EU3 06-09, VESPA LXV 125 4T NAVY EU3 07-08, VESPA S 150 4T 08-09, VESPA S 150 4T EU3 07-08, VITY 125 08-11, X EVO 125 07-16, X7 125 EU3 -08, X8 125 04-06, X8 125 PREMIUM EU3 06-07, X8 125 STREET EU2 06-07, X8 150 STREET EU2 06-08, X8 200 04-07, X9 125 01-02, X9 125 EVOLUTION -03, X9 125 EVOLUTION 05-06, X9 125 EVOLUTION EU3 -07, X9 180 AMALFI 00-03, X9 200 02-03, X9 200 EVOLUTION -03, X9 250 EVOLUTION -04, X9 250 EVOLUTION -06, XJ 600 N 95-97, XJ 600 N 99-01, XJ 600 S DIVERSION 96-02, YBR 125 07-14, YP E MAJESTY 125 -03, YP E MAJESTY 125 -04, YP E MAJESTY 125 -05, YP E MAJESTY 125 -06, YP E MAJESTY 125 -07, YP E MAJESTY 125 -08, YP E MAJESTY 125 -09, YP E MAJESTY 180 03-06, YP E SKYLINER 125 -03, YP E SKYLINER 180 -03, YP MAJESTY 125 -02, YP MAJESTY 150 -02, YP MAJESTY 250 -96, YP MAJESTY 250 -97, YP MAJESTY 250 -98, YP MAJESTY 250 DX -98, YP MAJESTY 250 DX -99, YP SKYLINER 125 98-02 (SOLO MY 01-02), YP SKYLINER 150 00-02 (SOLO MY 01-02), YP X-MAX 125 -12, YP X-MAX 125 -13, YP X-MAX 125 ABS -11, YP X-MAX 125 ABS -13, YP X-MAX 250 -10, YP X-MAX 250 -11, YP X-MAX 250 -12, YP X-MAX 250 -13, YP X-MAX 250 ABS -11, YP X-MAX 250 ABS -12, YP X-MAX 250 ABS -13, YP X-MAX 250 SPORT -11, YP X-MAX 250 SPORT -12, YZF-R 125 08-13, YZF-R 125 10-13, YZF-R 125 50th -12, ZIP 125 00-02

Engine size: 125 CC(APRILIA), 150 CC(BENELLI), 180 CC(GILERA), 200 CC(APRILIA), 250 CC(APRILIA), 400 CC(BENELLI), 450 CC(APRILIA), 50 CC(APRILIA), 600 CC(YAMAHA)