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Author Topic: Testing the charge output  (Read 8595 times)

Offline Andy1976

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Testing the charge output
« on: June 16, 2009, 11:48:48 PM »
The wires coming from the alternator are looking abit suspect, the plastic covering the wire is split and I can see bare copper on some of them.
could someone tell me how to test it to see if it's charging the battery properly? 
I've bought myself a multimeter today but I'm not sure how to test it.

Thanks again
Andy
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Offline Bryanj

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Re: Testing the charge output
« Reply #1 on: June 17, 2009, 06:49:12 AM »
Have you got the Honda manual cos its all explained in great detail in there?
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Offline Andy1976

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Re: Testing the charge output
« Reply #2 on: June 17, 2009, 09:45:52 AM »
All i've got is the Haynes manual.
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Offline Bryanj

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Re: Testing the charge output
« Reply #3 on: June 17, 2009, 12:32:26 PM »
On the US site there are links to down load a genuine one, I have all the 750 "Blue Book" Dealer Manuals on a CD but cant afford to send it out for nothing.

In that is a comprehensive list of tests to perform on your charging circuit to test for faults.

Basic test is battery voltage at various revs BUT using a GOOD FULLY CHARGED battery

Remember that these dont charge at all bellow about 2,500rpm and struggle to charge with the lights on especially if you upgrade to Halogen headlamp.
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Offline Andy1976

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Re: Testing the charge output
« Reply #4 on: June 17, 2009, 05:30:15 PM »
Thanks Brian.
Manged to download it from US site ok.
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Offline Bryanj

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Re: Testing the charge output
« Reply #5 on: June 17, 2009, 05:37:32 PM »
No problem, its easier for you to read it from there than me to type it here!

If you dont understand or have specific questions please come back and i will do my best to help.

Also on the US site is a Honda explanation of how the charging system works which might help.

http://www.sohc4.net/index.php?q=node/50
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Offline bobthebuilder

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Re: Testing the charge output
« Reply #6 on: June 25, 2009, 01:48:30 PM »
A milion thanks for link to Honda workshop manual download FANTASTIC , got wiring digram and will be back for more as a get going, only problem is I have discovered that my k2 has a wiring set up of k3-k7. so think I have k2 frame, wheels tank , the rest seams to be a bit of a mongeral, so my project for retirement might take me longer than I thought and cost more Bl--dy H---. Will be back a lot for a lot of help from you guys.
 Bobthebuilder. :-[
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Offline Bryanj

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Re: Testing the charge output
« Reply #7 on: June 25, 2009, 03:04:58 PM »
Remember that everything sold in UK was designated a K2 but had the "improvements" on the line as if it was a K3-6
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Offline bobthebuilder

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Re: Testing the charge output
« Reply #8 on: June 25, 2009, 07:19:58 PM »
About the k2 being improved in line in the uk dose that mean my k2 wireing although is not as per. honda maunal for k2 could be genuine, getting worried I bought a pig in a poke as a few parts seam to be not as specified in k2 descriptions.  any and all help really appriciated. Many THANKS.
      Bobthebuilder.
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Offline Bryanj

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Re: Testing the charge output
« Reply #9 on: June 26, 2009, 06:32:51 AM »
Yes it could well be original, what year was it registered and what are the frame/engine numbers then i will look it up in my ID book for you
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Offline bobthebuilder

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Re: Testing the charge output
« Reply #10 on: June 26, 2009, 07:20:31 PM »
The year reg. was 9.11.72.  Frame no. 2037710  Eng. no. 2706889  Reg no.  DED 108L  Thanks again  in advance .  hope it turns out OK.

Bobthebuilder.
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Offline BigAl (Alan)

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Re: Testing the charge output
« Reply #11 on: June 27, 2009, 10:30:45 AM »
Hi Bob,

From your numbers you have a K2 frame and a K7 engine.
Ref: Hayes Great Bikes Honda CB750 Mike Duckworth

Alan
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Offline Bryanj

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Re: Testing the charge output
« Reply #12 on: June 27, 2009, 01:09:56 PM »
The US ID book tells the same story so you do have a bit of a Frankenbike. The numberis low enough to be a 72/73 so the reg loks Ok and an engine change is also not uncommon with the age just means that it can never be classed as an "original" so the Purists get upset. I would rebuild to a decent running bike using whatever parts you feel like in whatever style and use and enjoy it
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Offline bobthebuilder

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Re: Testing the charge output
« Reply #13 on: June 27, 2009, 05:36:20 PM »
Thanks Guys glad you are all there, really wanted an original, so to put it back where would I get a k2 engine? whats the average price?  and would it be a big job!!!! and any one want to buy a good" k7 engine" ???

Bob
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Offline Bryanj

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Re: Testing the charge output
« Reply #14 on: June 28, 2009, 10:40:58 AM »
A K2 engine may be available at a breakers, Or see if mr Silver has a set of NOS crankcases with no number and build yours into them
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