 Rectifier regulater question
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Ive been having trouble with the batt going dead while riding, starts fine runs fine shut it off wont start again. replaced the batt, checked all connections, new batt voltage checks out good when engine is off and rises 1-2 volts at 2000 rpms but when I switch to AC on the meter the voltage rises to over 20 volts. After reading about this in the tech vault Im leaning towards a bad rectifier reg. Is there any thing else Ishould check or another way to test?
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Re: Rectifier regulater question
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Joined: Apr 2007
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Loquacious
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You have to check the voltage in DC (direct current) mode. AC is for alternating current normally found in household circuits. If you have battery voltage and it climbs 1 to 2 volts at 2000 rpm, the alternator and regulator are ok.
Before you replaced the battery did you check the voltage? The no start condition might not have been battery related given the voltages you stated above.
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: Rectifier regulater question
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Joined: Jan 2005
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Check out this thread for a previous discussion.. lot's of good info and #'s...
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Re: Rectifier regulater question
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Joined: Apr 2007
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Loquacious
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I guess you could check AC output of a 3 phase alternator directly, before it is rectified. Typically AC output is converted to DC through the rectifier bridge which is a series of diodes (2 per phase). These might be build into the regulator, but I'm not sure. Never checked AC output on an alternator because you couldn't easily (sealed). DC is really all you need to check.
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: Rectifier regulater question
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When i talked about the AC voltage this is the thread I was refering to I am familiar with electrics but have never troubleshot a charging system before Thanx for taking the time to help me . Today I got a better meter. and am hoping to retest tommaro and post the results. http://www.bonnevilleamerica.com/forums/...true#Post283059
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Re: Rectifier regulater question
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Joined: Apr 2007
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Never thought of using an AC voltmeter to pickup a bad diode but I guess it is possible. Not sure what to say about 20 volts showing on AC other than you could have a failed diode in the regulator. Is the regulator servicable, who knows? If the diodes are accessible, then yes. The fact that some charging is taking place shows that the regulator still works.
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Re: Ok new meter new readings
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So I got a new meter and checked it again. not running 12.1 volts when started drops to 11.8 and stays right around there no matter what engine speed.
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Re: Ok new meter new readings
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Before you do anything else, check your fuse panel. Fuse no 11 might be burnt. The regulator feeds the battery through that circuit. Check your other fuses while you are at it.
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Re: Ok new meter new readings
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fuse 11 checks out good as do all of them. when fuse 11 is pulled nothing works.
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Re: Ok new meter new readings
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Assuming your alternator and grounds are ok, with no broken wires, the only thing left is the regulator/rectifier.
Any other comments, suggestions by others???
12 Rocket Roadster
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Re: Ok new meter new readings
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Have consulted wire diagram. checked continuity from the ground wire in the plug to bat. and frame, checks out good. checked cont from charging wire in plug to fuse 11, also good.
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Re: Ok new meter new readings
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When you unplug the 3 wire alternator lead from the regulator, what are the resistance values? I imagine they should be insulated (ie not grounded). The only way you can check them is to measure from one lead to the other so you are measuring the resistance values of 2 of the 3 phases at a time. Should all be equal.
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Re: Ok new meter new readings
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They arent. one pair =3.5 one pair = .30 the third =1.2. These readings with meter on (200uA) setting.
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Re: Ok new meter new readings
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Is there a way that I can test for the 70 volts AC coming from the alternator?
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Re: Ok new meter new readings
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Quote:
They arent. one pair =3.5 one pair = .30 the third =1.2. These readings with meter on (200uA) setting.
Isn't 200uA an amperage setting for measuring small current flow? You should be on an "R" or Ohm setting? Probably getting false readings.
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: Rectifier regulater question
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New rectifier regulater from TR dealer $315.00 YYEEAAAAA RRRIIIGGHHTT. $50 used one from Pinwall Cycles on ebay and shes chargin like a new one.
Thanks Gregger YOU DA MAN!
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Re: Rectifier regulater question
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Joined: Aug 2007
Posts: 10,735 Likes: 7
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,735 Likes: 7 |
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: Rectifier regulater question
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I checked this out too. thanks for the link in the other thread, by the way. this rec. only has four wires ours has 5 to accomidate three phase charging. and I knew the one that I ordered would at least bolt on and plug in even if it didnt work. This guy builds them in his garage and guarantees 'em. if I have trouble again I might take a closer look at them He does have on for three phase. http://www.oregonmotorcycleparts.com/FAQ.html
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Re: Rectifier regulater question
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Joined: Apr 2007
Posts: 3,063 Likes: 8
Loquacious
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Glad you got it going without breaking the bank. Appreciate the cudos but you had it pegged from the start. Have fun... 
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: Rectifier regulater question
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Joined: Aug 2007
Posts: 10,735 Likes: 7
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,735 Likes: 7 |
I guess I didn't even realize we have 5 wires instead of 4. The only time I ever looked at it was to upgrade the wire from the regulator to the battery for charging.
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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