battery rectifier question

S

supercafe

Coast to Coast
hello there.
i have a question on the rectifier on my cd 175.
what problems would i run into if it has gone bad???????????
my bike will run but as soon as i turn on my lights my bike stumbles and seems like it is missing. the batt is fully charge
6.32v. would this be the rectifier???
aswell the voltage does'nt change at the batt, but the bike runs...
i have a new batt ordered in and think some of the prob is the batt..
believe the bike is charging but would the rectifier, if no good cause it not to charge the batt??????
hope some one out there can shed some light on this for me....
thanks..
 
The rectifier turns the oscillating +/- voltage from the alternator to + only pulses that charge the battery. If your rectifier is dead, your battery probably won't charge and may lead to insufficient power to operate the lights and the coils.

New modern rectifiers are pretty cheap. Check the $50 mod thread. Not sure which one you would use for a 6V system though. Possibly the same one.
 
thanks Flugtechnik,
seems that it sounds like my problem. i have another prts bike with one on it. i am going to change it know from what you
are telling me..
one more thing how does the rectifier ground??? through the frame by the bolt through it????
any way thanks for the info.
later.
 
The rectifier may not be your problem, but could be. It is grounded by the green wire that comes off of it that leads back to the rest of the ground wires in the wiring harness. According to the wiring diagram, the rectifier has a simple plug that you need to disconnect. I guess the bolt is just to hold it on.

http://www.oldmanhonda.com/MC/WiringDiagrams/MCwiring.php#class

If the new battery and rectifier don't fix it, it may be your alternator not producing enough juice. I don't really know how to test that though.
 
I should also say that the problem is likely your battery. Although it measure 6+ volts, the health of a battery is determined by its ability to maintain those volts under load. Try checking the volts when the bike is running and you turn the lights on (after you charged the batt). If it drops significantly, then that is your problem.

Although, this is all likely a moot point since you've already ordered a new batt.

There is a way to test the health of your rectifier with a multimeter. Although mine was working, I just replaced mine with a modern one from radioshack for about $5 as explained in the $50 mod thread.
 
Flugtechnik said:
New modern rectifiers are pretty cheap. Check the $50 mod thread. Not sure which one you would use for a 6V system though. Possibly the same one.
Click to expand...

yep any rectifier that will work for 12v will work for 6v the important thing is if you need a single phase or 3 phase rectifier the one in the $50 thread is a single phase while my bike and the tx500 I did for joe needed a 3phase one that you won't find at radio shack
 
whats up.
good info to know, but how do you find out what phase it is. is it on the rectifier????
thanks again.
later.
 
the stator would define the number of phases. As indicated on the wiring diagram for a CD175 it's a three phase generator. johnson (or is it steve?) is right, you probably won't find that at radio shack. if you're feeling bold you could buy the parts you needed from radioshack and build your own... otherwise i'd check the bay

http://cgi.ebay.com/ebaymotors/GENUINE-NOS-HONDA-CD175-CD125-RECTIFIER_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1205Q7c66Q3a2Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318Q7c301Q3a1Q7c293Q3a1Q7c294Q3a50QQ_trksidZp3286Q2ec0Q2em14QQhashZitem200317569098QQitemZ200317569098QQptZMotorcyclesQ5fPartsQ5fAccessories
 
The alternator for the CD175 looks the same on the wiring diagram as the one for my CL450. The radioshack rectifier works fine for me. I think all automotive alternators are 3-phase aren't they? That is why you use the "full wave bridge" rectifiers right?
 
[quote author=Flugtechnik]
I think all automotive alternators are 3-phase aren't they? That is why you use the "full wave bridge" rectifiers right?
[/quote]
no. a full wave bridge rectifier for single phase is comprised of 4 diodes so that it doesn't matter if the ac line is positive or negitive the electricity will be routed to the right dc wire; this is in contrast to a 'half wave' rectifier which is comprised of only 2 diodes and only conducts during 1/2 of the cycle choping the waveform in 1/2 hence the name.

a full wave rectifier for 3 phase is made up of 6 diodes as 3phase power has 3 ac 'hot' lines that are each 120* out of phase with eachother. the $50 mod thread rectifier is a full wave single phase rectifier. the rectifier I just got for joe was 3 phase and was only $20 and its the new solid state type. as for if your's is single or 3 phase how many wires go to your rectifier and what color are they? I can point you in the right direction.
 
thanks steve.
when i get the cover off i will check and post it for ya..
because a modern one would be alot better than a 30 some thing one...
later.
 
hello,
just bought my new batt, and installed it. drove about 193 miles on sat with it, seemed ok.
got back and checked the resistance in the rectifier. the one off our prts bike was reading properly, one way high resistance
and the other low. the one off my bike had no reading at all, re/re and checked for charging, ok now. took aprt the old
one and the ground was melted..
i have'nt had a chance to go out for a ride, but will keep you posted when i do.
thanks for all the help.
later..
 
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