Bike dynamo Hi I have problem dynamo thanks

the single terminal is the power or + terminal, this will run power to the positive terminals of all the lights

The generator, or dynamo, fits onto the back fork bar of the bike. The top, which rotates, should be close to the tyre of the back wheel. There's a little lever which you press downwards. When you press it the dynamo moves in against the tyre so that when you're cycling the movement of the wheel causes the top of the dynamo to rotate. To stop it, or turn off your lights, you pull the dynamo back out from the tyre. You need to adjust the dynamo so that the top of the dynamo makes contact when the lever is pressed but doesn't when it's pulled back out.

Normally a dynamo has only one wire which connects to the lights. You need to use lights designed for it. This carries the positive current. The frame of the bike usually acts as the negative. Some dynamos may have 2 wires. In this case the positive connects to the centre of the light and the negative to the outer.

Monitor the battery voltage. Start the bike.
At fast tickover the battery voltage should rise, at 2000 RPM or there abouts the voltage should rise up to but not beyond 14.5Volts. Any more and your battery will boil!
If the voltage on the battery does not rise, either the regulator/rectifier block is faulty or the generator is not working.
There are other factors to take into consideration: Are you using a Dynamo or Alternator?

Any more infor and I shall need more details. Bike make model, age. dynamo, alternator etc.

Hi, I own a 1976 XLCH1000 and had a similar problem some years ago.
The dynamo must be energized correctly as if not it wouldn't work.
Disconnect the two wire on the dynamo.
Connect a volt meter from the armature connection to the bike frame, negative.
Start the bike up and on a fast tickover there should be 2 to 5 volts present. Momentarily connect, while still monitoring the voltage, a wire link from the field connection to the bikes frame (earth or negative of the battery). The voltage should shoot up to about 25 to 30 volts. If it does you have a good dynamo. If the dynamo is flashed the wrong way around then a negative voltage instead of a possitive voltage will be produced and damage the regulator if it is the electronic type, like on mine.
If the voltage is low, change the brushes and clean the commutator with some wet and dry paper scraping out between the segments to clear the dead carbon deposits. Don't forget the end bearings are "Oilite Bearings" Don't use grease a drop of 20-50 is fine.
Anywhere else in the world, we put voltage on to the field terminal to produce current at the armature, trust the Americans to be different!
Ride safe and loud pipes save lives!
Hope this solves your problem.

change repair shop for one. the knocking might come from bad gas, fuel up with supreme at reputable gas station. your dynamo/alternator/voltage regulator is probably not working properly either. check voltage

try to fix it tightly so there wud be more friction between tire and your bikes dynamo....

Hi Cathy. I have the same dynamo but no instructions, can I please have a look at your instructions.
I fitted the dynamo, but I'm not sure how to connect the wires. And I don't know which direction the wheel has to turn in.
Have you got yours working?

The bottle dynamo rides against the tire turning it . The wires from it go to the front liht. The same two wires  may also be hoked to a back light. The  direction of flow is not that important but most put the same (one of the two ) wire on the center connection. If you generator has only one wire, then the light(s) will have to be grounded through the frame.

You want to attach this item to the rear of the bike. Mount it so that when you hit the switch the item lean over and hits the rear tire. Hook up the wire to the lights and your all set. Now I can tell you that with this item NOT engaged you will be able to ride with no problems, but with this item engaged it will give you resistance. Meaning that you will know how much harder it is to pedel the bike. I had this item and then went and purchased a battery power item.