Question about 1987 Yamaha YX 600 Radian

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86 yx will run for about 15-20 minutes, then die. All connections have been checked. New battery,but it wont hold the charge, something drains it. Could alternator need replacing?

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You can use a volt meter across the battery with bike running should charge at 13.5-16V range when you rev it. If there is only battery voltage check the 3 wires coming into the voltage regulator, they are from the alternator and switch to AC voltage scale , connect neg lead to ground, hot lead to any wire--should be around 35 VAC. If not you have fried the stator, probably due to shorted wire somewhere it is not fused, check wire to starter solenoid , wires from alternator where they go through the case , on chain bikes usually where chain has rubbed through.

Posted on Oct 08, 2009

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1 Answer

Battery wont stay charged


If the alternator is good and the battery is new, then something is draining the battery while it's parked. In the old days people left their headlights, radio or something on and this drained the battery. Now a days this is not as big a problem with 5 minute timers that turn off lights if you forget. I would take it back to whomever did the alternator work for an answer. How old is the battery? You can take it to see if it can't hold a charge any longer. In my experience, most batteries don't seem to hold a charge after about two years. Did anyone do some custom work in your car that requires electricity? It could be this extra stuff is draining the battery.

Feb 19, 2015 | Cars & Trucks

1 Answer

1986 yx 600 new battery wont hold charge


Hi, Anonymous the systems check below is geared towards Harley Davidson so exact numbers might differ slightly with book specs on your bike but the basic principal is the same, in order to check out any main electrical system, you have to start with a fully charged battery 12.5 volts or better, and be able to pass a load test if necessary. "WARNING" never plug or unplug any electrical connector with the engine running !!!
1. Check battery terminals for damage or corrosion, check battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
2. Check the voltage drop at the battery when you hit the starter button, anything below 9 volts you might have a faulty battery.
3. Check voltage at the battery with the bike running at 3,600 RPM should be 14.3 to 14.7 volts. If you are not getting these numbers, you might have a faulty voltage regulator.
4. Make sure voltage regulator is "GROUNDED" and functioning properly, watch the video below on how to test a voltage regulator.
5. Unplug the connector to the alternator and hook your multimeter leads to the alternator (pin/socket selection does not matter) set the multimeter to AC volts, at an idle the multimeter should read 16 to 20 volts AC. at 2,000 RPM 32 to 40 AC volts, 3,000 RPM 48 to 60 AC volts. If you are not getting these numbers, you may have a faulty alternator rotor.
6. Set the multimeter to OHM'S, connect one lead to the alternator (any pin/socket) and the other to a ground, the multimeter should read infinity. Connect both leads to the alternator multimeter should read 0.1 to 0.2 OHM'S. If you are not getting these numbers, you have a bad stator.
7. Check all wiring in the charging circuit for worn or chaffed spots and all wiring connectors in the circuit for corroded, broken, or loose pins/sockets, which is the # 1 offender.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
1986 YX600 Radian runs for while then dies BAR Bay Area Riders Forum
1989 FJ1200 Not holding building charge
Yamaha YX600 Service Manual
OEM parts for Yamaha
http://www.badrad600.com/Radian%20Manuals%20-%20Complete%20-%20Printable/Radian%20Owner's%20Manual%20Clean%20Complete%20Final.pdf

Apr 20, 2014 | 1987 Yamaha YX 600 Radian

1 Answer

1971 monte carlo won't stay charged


id say you have a drain somewhere have you installed something new lately check battery with a volt meter when running to be sure alternater is charging

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My first guess would be a bad connection at one of the battery posts, or a dead cell inside the battery.

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Car wont stay charged new alt, new battery, runs for a while but will die after few minutes running


If your Pontiac has some years/miles on it and has the original starter, it may be shorting and causing the heavy drain on the battery

Oct 14, 2013 | Pontiac Grand Prix Cars & Trucks

1 Answer

My battery keeps dying and I just bought it new a week ago. The alternator is also pretty new. It seems to be something with the wires or a loose connection of some sort, but I just can't figure it out. ...


If your battery is dying over the course of time, you may have a drain of some sort on the battery when the car is off. You need a volt meter, which you can pick up at a parts store or at Walmart for as little as ten bucks. With the car off, you should read around 12 volts across the battery terminals. It will vary a little bit with temperature. Then, with the car running, you should read one or two volts higher across the terminals. If that checks out, your battery is being charged by your alternator.

Let your battery charge with the engine running for a good 20-30 minutes--ideally while you are driving without the radio or headlights on. That should give you a decent enough charge. Now, assuming that your battery cables are tight and that they are not damaged or corroded, your new battery should hold a charge. If it doesn't, the next step is to check for lights or accessories that are draining the battery with the car off.

Dec 13, 2010 | 1993 Mercury Tracer

1 Answer

My 1993 camry toyota wont hold a charge, a


you need it checked by auto electrician to find battery drain

Feb 19, 2010 | 1995 Toyota Camry

1 Answer

Still will not keep battery charge


no the starter wire wil NOT cause this, check and clean all connections at the battery, have the battery and alternator load tested. one or the other is bad. also check for parasitic drain on battery,meaning when everything in the car is off, something is still drawing power,use a volt meter for this test,if you need more help get back to me and we'll go from there Ray

Feb 17, 2010 | 1987 Ford Tempo

3 Answers

One year old battery kept dying. It tested bad and


There is some things to check....

(1) Is your alternator charging? take your vehicle to Advanced Autos, Napa or someone like that and have them test your alternator.
(2) Is there something in the vehicle causing excessive drain on the battery when the motor is not running... like is the interior light may be on or something to that affect.
(3) Are you doing enough driving to recharge your battery? short stops and starts is not good for a battery as you may rob more energy from the battery then you are putting back in.
Sounds like something is draining your battery, something must be left on in the vehicle, Advanced Autos or Napa should be able to tell if something is draining your battery when the vehicle is off.

Aug 28, 2009 | 1988 Chevrolet Blazer

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