Just signed up but have been lurking for a little while... I bought s 2004 VFR800 and pretty quickly had charging issues. Soooo thanks to everyone who's already taken the time to ask/respond to R/R and stator issues. I've now installed a new mofset R/R and stator based on earlier threads/recommendations from VFRworld members, and as luck would have it, she started right up first time. I don't think I'm finished yet as the fuse (and fuse holder)) on Red coming from Battery positive is burned. This fuse is currently a 75amp and it's burned which is why I'm concerned. By my read of the wiring diagram it should be a 30amp fuse. Pre-repair testing using The Drill, I was sure my stator was fried (it was), but I wasn't as sure about the R/R but decided to upgrade the R/R to ensure I got the problem. I've wired the R/R direct to battery. My questions; could a bad R/R cause that fuse from battery positive to blow What kind of damage should I look for (and where) from having a 75A fuse installed where a 30A is specified While I've direct wired the new R/R to the battery, should I have a fuse inline on this connection Thanks in advance, and many thanks to all writers who've enabled me to get this far. John
Hi John. Assume you are talking about Main Fuse B. As to why anyone would install a 75amp fuse where a 30amp should be is beyond me! It won't cause any issue UNTIL you have any form of short on that line, as you now have increased the current capability by 2.5 times you could potentially burn up your wiring instead of the fuse blowing protecting it! Main Fuse B is the one not in the Starter Relay, but next to it, and is well known for developing high resistance joints in the fuse holder and its wiring along with its inline joiner see attached pic. This fuse supplies power to all your EFI stuff and shouldn't have any accessories wired into it. With the original R/R and wiring it also provides protection in the event of an R/R internal short on the output stage, If you've directly wired the new R/R to the battery which is a good thing, then Yes you should have a 30amp inline fuse for the positive lead. This will protect your wiring and battery in case of an R/R internal short. DO NOT USE AN AUTO RESET CIRCUIT BREAKER. Main Fuse A In the Starter Relay can also have its problems, mostly the spade connectors within the Red 4p plug, see attached.
Thanks Grum, much appreciated. Yes, it's main fuse B. I've ordered a used battery harness to replace the entire wire fuse and connectors and will use a std 30amp fuse. I'll go find main fuse A and check its condition. I haven't had any other issues so hoping this and a new front tire gets me back on the road