charging

My battery stays at 12.5v for good while when riding and then stops charging randomly leaving me stranded. The stator is good and has new wires. I am using a Rick's reg/rec for lithium-ion batteries and an Antigravity 4 cell. I thought the battery was bad so I bought a new one but it does the...

Hi Guys, I need to pick the brains of anyone good with the start and end points of charging system on the XS. Mine is a 1981 400SE UK model. I’m very comfortable working with 12V DC Vehicle electrics so am rewiring this bike from scratch. I’m just previously used to four wheel charging systems...

Hello, Have a Yamaha XS400 sh andIm having to charge my battery once every two weeks. i’ve tested using a multimeter the stator (which is running its specs) and the reg/rec (running to specs). i’ve tested for amperage draw, get none. pretty sure everything is grounded fine. still, my bike...

I know i've read threw most of the posts about this, but I just don't understand what is going on. Help me out? The skinny: From engine: Black - field coil ground? Green - field coil 3 whites- ac current I have the r292 VR, the magnet works when energized directly from battery, green receiving...

I own an SOHC XS400 as of today ! when wired to a new battery this thing runs beautifully but it wont charge the old battery. Thus I figured that I would try to replace the Regulator and Rectifier (which were cheap on ebay) and then replace the stator/alternator. However, this bike has a weird...

Hey guys & gals, I'm working on converting from the stock charging system to a PMA charging system on an XS400. The stock charging system was getting weak (although I didn't note it had failed) and the rubber seal where the wires pass thru the crank case cover were a leaking spot. I...

Ok guys, here we go again! I know this is another thread that has been posted probably about a MILLION TIMES. So I am just going to say that I did READ THE MANUAL, performed the tests as they say. I did search around on different threads for answers, but it seems that they always start off with...

Hey guys... Really need some help trying to sort out my '79 XS400. I've had some major issues along the way since day one with this machine and I'm close to calling it quites. If I don't soon my wife is going to force it!!! Background: I bought a 1979 Yamaha XS400 with 18000 kms on it. Has...

Time for new battery or can I just top 'er up with distilled water? Apparently <1 year old as of PO. All the levels are way different and around 1/2 full or so. Has died 3 times in the last week and a half due due to my cranking over and over while tinkering and not taking her out for a ride...

Hey guys, I just bought an rr38 reg rec to go on my project. It came with a diagram but id expected it to be the same as an xs650 but it isn't. Does this look right to you? Cheers

I just finished upgrading my bike to a pma charging system, and since it went so well I figured I'd write up a guide for it to give back a little to the community. The fragmentary information from the thread we have on this forum isn't really of much help. This isn't a difficult project, but it...

I'm in the process of trying to upgrade the charging system on my xs400, and am trying to figure out how to mount the stator to the engine case. I saw in the thread on this forum about a member who did it who just slapped a metal plate between the casing and outer shell and sealed the gaps with...

Does anybody have a simple wiring diagram for the xs 400 . I have I running but I mite have a charging issue..any help be greatly appreciated I want make sure its not on my end

I was about to do the rewire for the charging system but my friend talked me into doing more tests. The charging system passed all of the tests. Except actually charging. I replaced the voltage regulator and it started charging but not much. The PO put in some pretty shoddy fuse holders and we...

I have what I thought was a regulator issue with my 1980 xs400G, but I just replaced the regulator and I'm getting the same behavior, so I'm wondering if it could be something else. Here's the story: - I've got a topped off battery that reads 12.5V across the terminals - When I put the key in...