Regulator/rectifier or stator

[Via]

Got a very cheap er5 as a project for when I get DAS (hopefully in new year).

Was advertised as needing stator as battery discharges when headlight on... Tested it today and stator seems ok...

Unplugged and on multimeter shows 60-70 VAC when revved (should be 65 at 5k but rev counter on the fix list so couldn't say for sure lol).

Infinite resistance to ground and 0.2 (or 0.02) ohms between pins... Can't remember where decimal was.

When running with lights off get about 12.5v slowly creeping up, with lights on drops down to 12.3v and is slowly discharging about 0.01v a minute, switch lights off and creeps up again.

Is it likely regulator/rectifier needs replacing or is it still likely to be stator?

[Stu]

Ideally you want to check the output from the reg/rec

There is usually a multi plug you can test at

This will then give you a true reading and eliminate the wiring

The stator seems to be putting out what it should

[Tango]

Are you sure it's not just a duff battery.......If it's not that, then the Reg/Rec or wiring could be suspect.....

[fastbob]

Oh lovely, an ER5 question. First off does the rev counter work ? The reason I ask is that blown tacho on ER5s is very often a warning sign that the rec/reg has also failed . The good news is that you can get a Chinese copy rec/reg for about £13 on eBay if you don't mind waiting a few weeks . I've got one that I never fitted because it turned out that I didn't need it . I eventually traced my starting problem to having a handful of filth moving around inside the starter motor. By the way , my rec/reg is mounted under the seat behind the battery instead of down behind the engine where its supposed to be. If you want to have a look at my ER5 project it's on here in Readers Rides as ER5 Winter Project and in Old Bikes and Restorations under Aluminum Restoration. Good luck. Anything else you want to know about ER5s just ask , I'll be happy to try and help.http://i.imgur.com/p0Cijit.jpg

[Via]

Cheers for everyone's replies...

Battery is possible but unlikely, its a replacement battery (albeit used) but have another known good one I can swap it to try.

Yes tacho is dead (noticed that when I went to test stat @ 5k lol) put it down to wiring and was on my todo list but that sounds likely reason now... so secondly to that is there a fix if that's what caused it or will that need to be replaced?

You interested in selling your spare reg/rec?

Thanks, no doubt will have more as will probably have more as I work my way through the list lol.

[fastbob]

If the cause of the tacho failure IS rec/reg related then its probable got a burned out diode so you may be able to snip it out and solder in a replacement. BUT this is not yet a certainty so don't jump to conclusions like I did.

[Via]

Not had chance to look much deeper so far work keeps getting in the way and too dark by time I get home but did get chance to pull clocks off and bring in to look at, does look like it has been caused by reg/rec a resistor is totally fried.

Second to this does anyone know or know where I can find out what resistance this resistor it's (R1) so I can replace it?

[fastbob]

Not had chance to look much deeper so far work keeps getting in the way and too dark by time I get home but did get chance to pull clocks off and bring in to look at, does look like it has been caused by reg/rec a resistor is totally fried.

Second to this does anyone know or know where I can find out what resistance this resistor it's (R1) so I can replace it?

 

Yep that's the one alright . Now that the rec/reg has become more likely to be at fault it's well worth mentioning that your electronic ignition box is very much at risk of being fried . By the way a lot of this knowledge was gathered from my time as a member of the ER5 Owners club forum which has now disappeared.Here you go http://i.imgur.com/ELVIEkb.png this is from another forum .

Edited December 6, 2017 by fastbob

[Stu]

By the way a lot of this knowledge was gathered from my time as a member of the ER5 Owners club forum which has now disappeared.

 

Looks like people need you!

Get one started up

[fastbob]

I've been back on eBay trying to find another replica ER5 rec/reg for £13 and failed dismally. Either I got that price wrong or that seller doesn't do them any more. Prices seem to vary enormously from about £50 to £100 with everything in-between.that's for new pattern ones , I don't think its worth bothering with second hand to be honest.

Edited December 6, 2017 by fastbob

[Via]

Cheers massive help, got some spares ordered.

Will delve into the wonders of the reg/rec at weekend and hopefully get some answers, when researching online about it a lot of posts have said it is impossible to test a reg/rec yet I found a nice ER5 service manual which gives a test procedure (multimeter set to ohms on pins X & Y, get reading A swap leads round and get reading B, one should be 10x the other, repeat for other 2 pin groups) is this a reliable test or not?

[Via]

I've been back on eBay trying to find another replica ER5 rec/reg for £13 and failed dismally. Either I got that price wrong or that seller doesn't do them any more. Prices seem to vary enormously from about £30 to hundreds with everything in-between.

 

Yeah found the same when I looked, tbh I had budgeted that for a new stator anyway so all works out

[Petrolheadstu92]

Im new here but know my bikes ...

I brought a bike not so long ago had this charging issues .. took a while testing here there and everywhere .. cut a long story short its a long shot but my head lights bulds where to high wat on main been .. they was halgeon car bulbs ... soon as i changed them issue was sorted .. stator was fine . As where reg/rec on meter ...

Ride safe, Check your Bolts mate ..

[Via]

Well I pulled reg/rec and now thinking it may be wiring, just a 6th sense atm...

[Via]

And to top it off looks like it was wired incorrectly, just been looking at wiring diagram to ensure I solder them back correctly, previously it was connected white -> green and brown -> red, yet wiring diagram has white as 12v and brown as ground

[fastbob]

And to top it off looks like it was wired incorrectly, just been looking at wiring diagram to ensure I solder them back correctly, previously it was connected white -> green and brown -> red, yet wiring diagram has white as 12v and brown as ground

 

What a bloody mess ! They weren't even soldered by the looks of it . Looks like someone has fitted a similar rec/reg of a different bike .

[Via]

Seems to be a cheap version as seen same colour wiring and different plug but advertised as er5 when looking myself... Not soldered just crimped

Well dusted soldering iron down and had just enough solder to redo it... But it is far too cold to go faff about outside so think I'll save testing it till tomorrow

[fastbob]

Seems to be a cheap version as seen same colour wiring and different plug but advertised as er5 when looking myself... Not soldered just crimped

Well dusted soldering iron down and had just enough solder to redo it... But it is far too cold to go faff about outside so think I'll save testing it till tomorrow

 

This is the Chinese one I was going to fit but never did. I never got round to figuring out if the wire colours corresponded , I was going to just plug it in and hope for the best. http://i.imgur.com/PmsnjNw.jpg and this is from the factory manual http://i.imgur.com/rCNGllO.png confusing or what? If it helps I can have a look at my ER5 tomorrow provided it's not covered in snow.

[Via]

That's manual I've got... Really good I'm happy it's right way round now 15-31 is diagram terrible double print but enough to see white is positive, black/yellow is negative and brown is ground

[Via]

Well hooked up the reg/rec and fixed get 14.5v now at idle with headlight on, had a jammed rear brake as well which is now sorted as well just needed to free the pin so both faults fixed with no parts cost got plenty of other bits to do to it though just to get it back to tidy condition

[fastbob]

Well hooked up the reg/rec and fixed get 14.5v now at idle with headlight on, had a jammed rear brake as well which is now sorted as well just needed to free the pin so both faults fixed with no parts cost got plenty of other bits to do to it though just to get it back to tidy condition

 

Brilliant, have you discovered Pony Power aka Matt and his amazingly good series of ER5 restoration videos on YouTube ? These are an absolute must see for anyone doing up an ER5. Enjoy.

[Guest]

14.5 V is OK.... just to check, hook up voltmeter across battery and blip the throttle.... Voltage should not go up much if at all.

[Via]

When rev'd voltage initially drops then creeps up to about 14v, never goes higher than 14.5v

 

Brilliant, have you discovered Pony Power aka Matt and his amazingly good series of ER5 restoration videos on YouTube ? These are an absolute must see for anyone doing up an ER5. Enjoy.

 

Oh yes! That's how I knew what to do with rear brake, fork seals need to be done as well so watched through those and so simple! (apart from his 3 hours separating them, really hope I don't have that much grief with mine).

Really split 50/50 atm if I should do a full strip down and restore or just get it back into reasonable condition.

[fastbob]

When rev'd voltage initially drops then creeps up to about 14v, never goes higher than 14.5v

 

Brilliant, have you discovered Pony Power aka Matt and his amazingly good series of ER5 restoration videos on YouTube ? These are an absolute must see for anyone doing up an ER5. Enjoy.

 

Oh yes! That's how I knew what to do with rear brake, fork seals need to be done as well so watched through those and so simple! (apart from his 3 hours separating them, really hope I don't have that much grief with mine).

Really split 50/50 atm if I should do a full strip down and restore or just get it back into reasonable condition.

 

Well I never really intended to do mine up beyond making it reliable and road worthy but it kind of grew on me . Have a look at my post in Readers Rides entitled my ER5 winter project. Forget what the critics say , this is a great little bike once you iron all the bugs out. Mine has reintroduced me to a more comfortable laid back style of biking and is the main reason I'm looking to sell my GSXR and get a Harley next year.