Question about 1975 Honda GL 1000 (K1)

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Charping system Bike runs...battery doesn't charge while do I replace diode or rectifier,,,what do they look like and how to test?

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I would start by getting a shop manual, Get either a Honda manual or a 3rd party manual by Clymer or Haynes. The manual will have pictures/diagrams of the locations of different parts and a wiring diagram which you can use to trace all the wiring and connectors. The manual will also give instructions on how to test the regulator/rectifier/stator etc. You will also need a multimeter.

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Charging problem

There is a thing called a bridge rectifier. It clips 1/2 of the AC power coming from the alternator. It makes the battery think it is getting DC - it is actually rectified AC. If there is a bad diode in the bridge, your battery will not charge. Test with a flash light battery and lamp. Good will pass power in one direction but not the other. If you can get the light to work in both directions, there is a bad diode.

May 08, 2013 | 1988 Suzuki GSX 1100 F (Katana)

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Bridge rectifier ...

May 07, 2013 | Motorcycles

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About motorbike

Do you have a battery? Have it tested. If it fails the test, replace it. If it passes the test, check all fuses and ground conection as well as hot side connections. If the battery is good, all connections clean and solid, all devices in working order, it has to work. If it works and the battery does not hold a charge, consider the alternator and other parts of the charging system with particular interest in the diodes in your bridge rectifier. diodes can be checked with a flash light battery, a short piece of wire and a flash light lamp. A working diode will pass electricity one way but not the other. Non working diodes can bleed the power out of the battery to ground while you are not running the motorcycle.

Dec 02, 2012 | kawasaki KMX 125 Motorcycles

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My battery keeps dying and it won't start.i replaced with a new runs for a day then dies again.sometimes it keeps running when i shut it off. then i disconect the battery to shut it down....

is bike gitten proper cooling-make sure radiator system is ok--chek wire harness for any flaws--alternator shud be tested for batt chargin--get a repair manual from fixya

Aug 05, 2011 | Jonway Chopper Type 5 Shovel Motorcycles

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Have a 99 suzuki intruder 1500. Have replaced the battery 3 times. The battery keeps dying and I'm dying on the inside. So frustrating. Could the timing be off? I even replaced the starter thinking it...

My friend ... you say you have replaced the battery three times ... My first thought is a MC battery lasts about 3 years . 3X3 = 9 years ... you have had excellent service getting 12 years from three batteries. But alas, I think you are saying you have replaced three batteries one right after another ... and you did this recently. You say you suspect the timing ... not the problem The time your engine fires has little to do with battery health. Next you say you suspect the starter ... the starter is a motor that you control with a switch ... it either runs or it doesn't run ... it too has little to do with battery health. I suspect there is something wrong with your Suzuki involving either the alternator or the rectifier. The inside of the rectifier you would find a bridge made up of probably 4 diodes. A diode is a one way switch that allows power to flow from A to B but not B to A. This allows the output from your alternator (AC power (Alternating Current)) to be "rectified" into a kind of power that looks to the battery like DC (Direct Current). Your motorcycle actually runs off the battery ... the alternator's job is to keep the battery charged. (By the way, you have to put power into a alternator to get power out of it since an alternator is normally not "self exciting". If your battery is dead, even if running, you are not making electricity to charge the battery.) If one or more of the diodes are shorted in the rectifier, that allows power to go from A to B and B to A. When this happens, power doesn't become "DC" to go into the battery, actually, it goes back to ground sort of like a short. That will 'kill' your battery. First off, the battery power is used up by the motorcycle, second, the alternator cannot charge the battery because its product (AC) is going to ground.

You can test your rectifier with a flash light battery, a flash light lamp and a paper clip. Disconnect the rectifier from the wire harness. If you put one end of the paper clip on the bottom of the battery, one end of the light on the other end of the battery, then touch the other end of the paper clip to the edge of the lamp. The light will light. Now, run the power through one terminal on the rectifier - out another terminal until the light works. ID the terminals. Then reverse the polarity. The light should not illuminate ... if it does, that means power is flowing through the diode both directions and makes your rectifier suspicious. Check all combinations of the various terminals you find on the rectifier ... (possibly up to 4 terminals or more).

If you don't want to do all this stuff, you can take the motorcycle (or the rectifier) to your local motorcycle repair shop and have it tested, probably for no or little charge.

Oh yea, your alternator could be bad, but I doubt it.

Good luck to you on this repair. Do not dispare.

Thanks for your question @

Apr 30, 2011 | 2001 Suzuki VL 1500 Intruder LC

1 Answer

The battery will not stay charged and the regulator rectifier get hot after running the bike for a short period of time. bike runs but not well when you disconnect the negative battery cable

sounds like the regulator/rectifier has failed. you need to check that you are getting 13.5 14.8 volts at the battery when bike is running, higher means failed unit and under means same. you need a diode tester to measure reg/rectifier and will also need to check stator output with multi meter on AC, should get 60-100 volts when bike revved with stator wire unplugged from regulator.
best solution is to take to your local shop and get them to perform these and other tests to confirm as electrical parts are generally not returnable once purchased as very easy to damage if put into a bike with other charging system faults

Aug 31, 2010 | kawasaki ZX-6R Motorcycles

2 Answers

Battery not charging

run an ohm test on the stator wires, make sure you get readings through all combinations of any 2 wires. if you don't get an ohms reading between 2 wires that means you have a broken stator winding and the stator needs to be replaced. hook up a volt meter to your battery and test battery voltage at rest (bike off), at idle (bike on and idling should be at least 12.5 - 13 volts), and steady around 3 - 4000 rpms (should be around 13-14.5 volts. if it exceeds 15 volts your regulator is bad and needs to be replaced. if all numbers are about what I said, have your battery tested. If your battery is over 1.5 years old it should be replaced anyway.

Jun 03, 2010 | 1986 Honda GL 1200 Aspencade Gold Wing

1 Answer

My 98 arctic cat 500 atv won''t charge the battery, how can I find the problem. I have an ohm/voltage meter

The charging system is comprised of a alternator, voltage regulator and a bridge rectifier. If the battery is not calling for power, the voltage regulator will not turn on the alternator. If the battery is calling for power and the alternaotr is on and the rectifier is not working, the power goes to ground.

Check the voltage at the battery with the machine running. You should have 12 or more volts - preferably around 14. Find the rectifier - it will be a cube with cooling fins on it. With a self powered test light, test it. A rectifier is made up of diodes ... the diodes clip off one-half of the AC cycle making rectified AC which charges the battery. Your test light should light in one direction and not the other. If it lights in both directions or neither direction ... your rectifier is suspect.

This is a lot ... when you get this stuff checked ... we will check the next stuff.

Mar 07, 2010 | 1998 Suzuki GS 500 E

2 Answers

Battery life doesnt last for more than 20 miles

If it's after you charge it fully, and then start and ride the bike, either the bike is pulling way too much power, or you just need a new battery for the bike.

Aug 11, 2009 | 1980 Yamaha XS 650 G

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