classic motorcycle forum
Motorcycle Discussions => British Bikes => Topic started by: john11668 on September 06, 2018, 04:38:43 PM
-
Cub is not charging and we believe that the rectifier is the problem . 9.5 volts easily out of the alternator cables. Nothing beyond the rectifier.
Got a replacement But while I am generally ok with electrics this one has got be beaten. We were recommended one by the local auto electrician.
Pics of old and new attached but there are so many options for connections on the new one, and I just cant get my head around the directions of the diodes
Any advice would be welcome
-
Pics of old and new attached but there are so many options for connections on the new one, and I just cant get my head around the directions of the diodes
As standard, your Tiger Cub's electrical system would be positive earth/ground.
That rectifier is not only a nine-diode type for a three-phase excited field (slip-ring) alternator as it appears to be a rectifier for a Lucas "ACR" alternator but it is almost certainly negative earth polarity.
http://freerollguide.net/probably-fantastic-free-automotive-alternator-wiring-diagram-pictures/images-of-wiring-diagram-lucas-18-acr-alternator-wiring-diagram-image138-that-great/
https://www.ebay.ie/itm/REPLACEMENT-12-VOLT-ALTERNATOR-RECTIFIER-LUCAS-ACR-LRA100-UBB109-83166-130643-/281815311556
A 4-diode rectifier like this is all that's required as it can be used for either positive or negative earth.
http://www.rexs-speedshop.com/Single-Phase-Bridge-Rectifier
Or:
http://www.classicmotorcyclespares.com/index.php/default/electrical/charging-system/classic-bike-rectifiers-regulators-bsa-triumph-norton/rectifier-replica-lucas-positive-earth.html#Charging_System
The old selenium rectifier needs throwing in the bin, regardless.
-
What he said.
The problem is that most auto electricians will know nothing about this type of system hence why they've sold you the wrong thing. Easy to connect - there are 2 connectors (diagonally opposite each other) for ac from the alternator - the other 2 are the + and - connections.
You'll probably find that there's a double wire going to one of the ac connectors - this connects extra coils of the alternator into circuit if the lights are switched on. Crude but quite effective.
-
Is it reasonable to assune these are the same kit ??
https://www.ebay.co.uk/itm/British-motorcycle-solid-state-rectifier/223116553410?hash=item33f2c86cc2:g:SGgAAOSwInxXOPCG
Postage seems a bit steep from Rex speedshop
-
Yes.
-
or this even , If you are not in a hurry
https://www.ebay.co.uk/itm/KBPC5010-1000-Volt-Bridge-Rectifier-50-Amp-50A-Metal-Case-1000V-Diode-Bridge/291862837146?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20131017132637%26meid%3D5ca3b54b4b66480bb0cfb182320b7463%26pid%3D100033%26rk%3D3%26rkt%3D8%26sd%3D223116553410%26itm%3D291862837146&_trksid=p2045573.c100033.m2042
-
or this even , If you are not in a hurry
https://www.ebay.co.uk/itm/KBPC5010-1000-Volt-Bridge-Rectifier-50-Amp-50A-Metal-Case-1000V-Diode-Bridge/291862837146?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20131017132637%26meid%3D5ca3b54b4b66480bb0cfb182320b7463%26pid%3D100033%26rk%3D3%26rkt%3D8%26sd%3D223116553410%26itm%3D291862837146&_trksid=p2045573.c100033.m2042
https://www.ebay.co.uk/itm/British-motorcycle-solid-state-rectifier/223116553410?hash=item33f2c86cc2:g:SGgAAOSwInxXOPCG
"I can buy in the KBPC 50-10 rectifier at 56 pence .I could start selling that type,however,they do not work in the same manner as the correct KBPC 35-04 that i supply.Sharp practice to be selling the wrong rectifiers as suitable on classic bikes."
-
When you say "do not work in the same manner" could you expand? From my limited electronic experience one bridge rectifier is much like another provided the operating parameters are the same.
Interestingly I seem to able to buy 2 35-04 for £2.50 with free postage.....
https://www.ebay.co.uk/itm/2-x-KBPC3504-Metal-Bridge-Rectifier-DIODE-35A-400V-W1O5/282785569446?epid=15011616854&hash=item41d7555aa6:g:ozQAAOSwEEBaQctS
-
When you say "do not work in the same manner" could you expand? From my limited electronic experience one bridge rectifier is much like another provided the operating parameters are the same.
I didn't say. It's a "quote" from the ebay ad.
-
Ah, sorry I misinterpreted.
-
Thanks for help so far guys but I am stuck again. Got the correct rectifier 35-04 and fitted it
Wiring on this cub however doesnt seem to fit any wiring diagram I have yet found.
See pics
Alternator wires seem to be a pair of green and white , and a single green
Rectifier had white/green, brown/purple , and green black . I connected positive direct to battery positive (earth) terminal and toog a guess that the Br/pu would be the one to connect to negative on the rectifier .
On firing up there was no real rise in voltage at the battery and the rectifier heated up quite significantly so killed it before it did damage. Can anyone advise if the connections I have made at the rectifier are correct , and if so what should be my next step?
-
Judging by the condition of that wiring the best thing to do would be to rip it out and replace it.
-
You may well be right , but maybe it would be better if we had the correct wiring diagram, and had resolved the charging problem first. Then we can go for the cosmetics
-
Having decent wiring is not entirely just a 'cosmetic' issue..... ?
-
Fine ! I can go with that but I would like to resolve the issue first . Then we can test out the functions of everything and if all is looking good we can deal with the duff wiring.
Can anyone add something constructive here
-
This any help?
https://www.flickr.com/photos/gymx/3311907432
-
Thanks for that murdo but unfortunately that diagram (which I had seen) does not cover this bike. The wire colours are completely different so it is virtually impossible to tie up.
The colors are shown in the pics in my earlier posts as in
Alternator-- green, green/ white , green/yellow
Rectifier-- brown /purple, white /green, green/ black
-
Just to finalise on this topic . Problem resolved !
Had to strip and clean ignition switch and we now havesupply to alternator and a reasonable charge rate (6.8v)
Thanks for the tips
-
And one more for luck.
Had significant helpon this problem here http://www.tigercubclub.co.uk/forum.html
Unfortunately the forum is closing over fears of the Data protection regs and intending to go to a facebook group .
Hope that this does not become a general exodus into a dangerous wilderness.
-
Other clubs haven't made known of any plans to close down over the DPA.
Sounds a little dramatic to me and F-B is better in many ways (although to be fair it did kill off Yahoo Groups) but Zuckerberg isn't really going to be able to steal your eyes when your asleep if the club does transfer...
-
That closure is a shame and, I think, unnecessary. Another single make site that I'm on issued their privacy policy; to which members had to click their agreement to continue. Very simple in my view.
I think you're at more risk under the wing of these sprawling giants of the web.
-
I agree. As admin of another engineers forum we took advice and were reassured .
FB format is not good for forums and the search facility is poor . It is also open to unidentified trolls and the admins are less able to keep a good reign on things .
I fear that if it is generally adopted as the home for foruns like this then we are on a downward spiral.
-
I agree. There should be no reason for GDPR to cause any forum to cease operation.
As for FB - I do have an account (with completely fake details and all "privacy" enabled) but find the "forums" pretty inane. The occasional useful postings are drowned out by the dross. But then that's the case for some non-FB ones as well - I'm sure you know which ones I mean.
-
Oh I dunno, there's some nice pictures of pies and accounts of life post-retirement going on at the moment. ;)
-
It's certainly up and down.
-
99% old fluckers on it, but some good cruise deals and holiday advice.
Once upon a time if we didn't talk bikes we talked crumpet.
Speaking of which I got a packet at Tesco today from the reduced price section.
Nice.
-
End of day in the bakery section gets some good deals for the freezer
I decline to engage on discussion about stocking tops
-
I remember stocking tops................... ;D I also remember that tights were invented AFTER the mini skirt, enetrtaing if you were working in a hole in the pavement in Piccadilly, or going upstairs on the bus......
1960s were great.
-
Be careful of the BP at your age. Go and have a rub down with a wet lettuce. Like you, I was lucky enough to cop the last of the stocking era.
-
I know I went off topic but i apologise for what I may have started !
-
No harm done. I'm sure if the moderators wish to delete any off topic stuff, no one will be offended.
-
I always found stockings uncomfortable, did someone mention pies.
-
No need for concern, at least its not that other place.
BTW I am off cruising soon................
not on a boat, Manchester road Swindon :o :o :o
-
Did you mean Swinton??
-
nope,Swindon.
-
One wouldn’t want to lower ones standards would one.
-
Hard to get lower standards than Swindon, and Manchester road is the real bottom end
-
First read it and thought you said cruising to Sweden. They do some funny things there too.. :D