replacing the regulator/rectifier because of over charging

Started by rjb/AKA Bob Barram, April 11, 2008, 10:57:04 PM

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rjb/AKA Bob Barram

The problem was the battery was inconsistent with its charge. Sometimes while running the bike it would peak at 18 or 19 when it should only be at 14.5. Usually the battery will survive short time 30-50 minute rides without boiling over. My battery started boiling after an hour ride, then completely shutdown after another hour on the road.
Using a voltage meter do the electrical tests outlined in the manual to determine it is the regulator/rectifier (aka RR in this note). Order the RR from denniskirk.com. There was some comments that non OEM parts would not work here. This one worked for me when first attached, we will see what happens down the road. I have a voltage gauge on my dash board so I could monitor the voltage activity.

How to remove/replace the  RR.
1. remove the seat
2. disconnect the 2 cables to the rear of the battery going to the RR
3. get a 10mm socket that has a bolt like head on it that you can attach a small wrench to and masking tape the wrench to the socket. Make sure the socket has a deep nut slot so the bolt does not keep the socket from gripping the nut. If you cannot find a bolt like headed socket you can use a longer socket and a small vise grips. Attach or tape the two together and patiently use it to loosen the nuts holding the RR to the bottom of the battery case. (left to loosen, right to tighten) When you get the nut loosened with the wrench/grips you should be able to finish the job with your fingers and the socket.
4. run the new RR wires back up between the battery case and the rear fender. A hanger with a small hook on one end helps with this part. One thing you will find that is different with the denniskirk RR is the length of the cables are longer, which is good. But the bad part of the denniskirk RR is that the connectors are slightly too big to fit in the holders for them. But it allows you to hook them up easier.
5. Put the RR in the bolts sticking out of the bottom of the battery case and start the nuts with your fingers and socket. Once started finish with your homemade angled socket.
6. tuck away the extra cabling from the RR behind the battery box so it does not rub the bottom of the seat.
7. Now you are a satisfied Magna owner again!!!! 
MOOT#69
Prov. 3:5&6