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THE ENGINE IS PUTTING OUT 29 VOLTS AC WHILE RUNNING AND MELTING THE BATTERY POSTS AND TERMINALS. WE CHECKED THE RECTIFIER AND IT CHECKS OK AND CANNOT FIGURE WHAT IS WRONG

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Are th diodes ok if blown they can cause hi voltage ?

Posted on Oct 14, 2013

Testimonial: "I will check that part of the engine Thank you very much. Mike"

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The electrical system on my 2006 Buick Redezvous is making the car not start, my ac won't work as well as my backup lights. The garage wants to charge me $180 for each of several diagnostic checks..


have the battery checked out with a carbon pile discharge tester , this will test the battery under load , then test the alternator to see if is charging ok, make sure the battery terminals and posts are shiny clean, check the back up light fuse and switch, and check air con fuse . if the battery is below 10 volts the engine may crank but it wont start.

Mar 03, 2016 | 2006 Buick Rendezvous

1 Answer

Charging system 2003 26hp efi Walker checked terminal wires all good checked voltage rectifier it's was dirty so I clean the contact points checked the voltage with the machine running 12.5what next


Hi Mathew, perform the following tests:
1. Fill acid type batteries to proper levels.
2. Charge battery overnight at 1-2 amps you need 12.5 volts or better after charging.
3. 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 ohm meter if necessary.
4. Hook up battery positive cable, then with your multimeter on the milliamp scale connect one lead to the negative battery post and the other lead to the ground cable. Meter should read 3 milliamps or less, 10 milliamps with a radio, 15 milliamps with radio and CB. If your meter reads higher you need to isolate the circuit by pulling fuses and circuit breakers one at a time and observe meter for drop in amperage then get out your test light and track down the short in that circuit.
5. Hook up a volt meter to the battery and start the engine, if meter falls below 9.0 volts while cranking you need to perform a proper load test on the battery and replace if necessary.
6. With the engine running at 3600 RPM, the battery should read 14.3-14.7 volts if not continue tests.
7. Unplug the voltage regulator from the alternator at crankcase by the front of the primary cover.
8. With ohm meter, one lead grounded, touch alternator pin meter should read infinity, if not replace the stator.
9. With ohm meter, both leads touching alternator pins meter should read 0.1 to 0.2 ohms on 1989 and later models. 0.2 to 0.4 ohms 1988 and earlier models, if not replace the stator.
10. With the volt meter set on AC scale, both leads touching alternator pins meter should read 16 to 20 volts AC for every 1000 RPM'S 1989 and later and 19 to 26 volts AC for every 1000 RPMS. If not replace the rotor.
For more information about your issue please visit the websites below. Good luck and have a nice day.
Stock motorcycle regulator rectifier check out

Oct 15, 2015 | Motorcycles

1 Answer

Husqvarna Z turn changed the rectifier and the battery and something is still killing the battery


Ok.. The rectifier only changes AC voltage to DC voltage.. the voltage to charge the battery comes from the generator.
With the engine running at half throttle+, and IN NEUTRAL, check the voltage at the battery terminals it should be 13 volts +. If you are not getting at least that much.. make sure all connections are tight.. if its less than 13V..... more checking is indicated. (Shop time)..sorry...

May 17, 2015 | Husqvarna Motorcycles

1 Answer

How can I check charging system in scooty pep+


The normal way is locate the battery, using a multi meter set to 20 volt DC check the volts across the terminals, if your battery is 12 volt the reading should be at least 12.5 and at most 13.5. If 6 volt the reading will be somewhere between 6.5 and 7.5 volts. Remove meter, start the engine, connect the meter back to the battery keep it set to DC and 20 volt. Note the meter reading at tick over and slowly increase the revs the voltage should rise to about 14.4 volts for a 12 volt system and maybe 8 volts for a 6 volt one. If volts to not rise then check regulator/rectifier, if OK check alternator.

Dec 23, 2014 | 2008 TVS Scooty

2 Answers

96 dodge ram 2500 diesel turbo good batteries, alternator good.. batteries won't charge


check that the charge rate from the alternator is no ac current. A multi meter will show a charge rate of 13.5 to 14.5 volts but that could be unrectified current because of a failed diode in the rectifier in the alternator. Set the meter to read for ac voltage and if you have ac reading then have the alternator overhauled. Have a load test done to check the batteries for a problem cell under load.

Jul 05, 2014 | Cars & Trucks

1 Answer

Main fuse on 2005 daytona keeps melting and the clocks flashing on and off


is the voltage regulator or rectifier faulty,also check for a short circuit on the wiring loom.

Jan 23, 2014 | Triumph Daytona 955i Motorcycles

1 Answer

Replaced Battery, Stator, and Rectifier on Vstar 650 and still not charging battery?


Hi, Chrislbryan the following is a comprehensive charging system test that is guaranteed to the find issue with your system.
1. Battery Test: The battery needs to be a fully charged and load tested to ensure proper readings, connections need to be clean and tight. If you are not working with a fully charged and functional battery, all other voltage tests will be incorrect. Standing battery Voltage should be 12.5-13.2 DCV.
2. Charging System Voltage Test: Start motorcycle, measure DC volts across the battery terminals you should have a reading of approximately 13.2-15 DC Volts.
3. Check Connections/Wires: Inspect the regulator/stator plug, and check the battery terminals for connection/corrosion. If everything seems to be in order, move on to number 4 below to determine if there's a failed component.
4. Stator Checks/Rotor Check: Each of the following tests isolates the Stator & Rotor. If AC Output test Fails and Resistance Check, and Stator IB Test Pass then Rotor is at fault (Pull Primary covers and inspect rotor for damage).
5. AC Output Check:
Unplug the regulator plug from the stator
Start motorcycle and change Voltmeter to AC volts.
Probe both stator wires with your meter lead.
The motorcycle should be putting out approximately 18-20 ACV per 1,000 rpm. Reading will vary depending on system, check service manual specification
Generic Specs:
22 amp system produces about 19-26 VAC per 1,000 rpm
32 amp system produces about 16-20 VAC per 1,000 rpm
45 amp system produces about 19-26 VAC per 1,000 rpm
Stator Resistance Check:
Switch your multimeter to Ohm x 1 scale.
Probe each stator wires with meter leads and check resistance on the meter.
Resistance should be in the range of 0.1-0.5 Ohms. Reading will vary depending on system, check service manual for specification
Generic Specs:
22 amp system produces about 0.2 to 0.4 ohms
32 amp system produces about 0.1 to 0.2 ohms
45 amp system produces about 0.1 to 0.2 ohms
Stator IB test or Ground Check:
Switch your multimeter to Ohm x 1 scale.
Probe each stator wire with your positive lead on the multimeter and the negative to ground.
There should be no continuity to ground on either wire.
If there is continuity to ground your stator is shorted to ground.
5. Regulator Test: Each of the following tests isolates the regulator only, so if any of these tests fail, the regulator is at fault.
Identifying Wires:
Battery Charge Lead- Wire going from regulator to battery positive.
AC output leads- Wires coming from the Stator to the regulator.
Ground- Wire from Regulator to ground or regulator may be grounded via the physical bolting to chassis.
Regulator Ground Test: Ensure the regulator body is grounded or grounding wire is fastened tightly to a good ground (you should verify this by checking continuity from regulator body to chassis ground).
Fwd/Reverse Bias Test/Diode Test: This check is testing the Diode function to ensure it is regulating the AC current for the stator into DC Current.
Switch multimeter to Diode Scale.
Place your Multimeter positive lead on each AC output wire.
Place your multimeter negative lead on the battery Charge wire.
The meter should read voltage typically around .5 volts.
Next, switch your multimeter leads putting the negative lead on the AC output wires and the Positive lead on the Battery Charge Wire.
The reading should be Infinite.
With your meter on the same setting, place your multimeter positive lead on the regulator ground wire or to the regulator directly, and then place your meter negative lead on the AC output leads.
The meter should read voltage typically around .5 volts.
Next, switch your multimeter leads putting the negative lead on the regulator ground and the Positive lead on the AC output wires.
The reading should be Infinite.
Note: Below is a table to show the readings:
Positive Lead Negative Lead Reading
AC output 1 Battery charge lead Voltage
AC output 2 Battery Charge Lead Voltage
Battery charge lead AC output 1 ?
Battery charge lead AC output 2 ?
Ground AC output 1 Voltage
Ground AC output 2 Voltage
AC output 1 Ground ?
AC output 2 Ground ?
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Battery not Charging Yamaha Star Forum
http://www.jetav8r.com/Vision/Stator/fault_finding_by_www.electrosport.com.pdf
Yamaha XVS650 Service Manual
OEM parts for Yamaha
Yamaha star XVS650P Owner Manual

Jun 10, 2012 | Yamaha V Star Classic 650 Motorcycles

1 Answer

After a 2 hour ride out yesterday in daylight,i always turn my lights on to be seen when returned home switched engine off opened garage went to start bike again and completely dead has a data tool duo...


Might have 12.67 volts, but not enough amps to crank engine or light the lights properly. Try putting a charger on the battery, bring it to a full charge. Next, put a load tester on the battery to see if battery is weak or dead cell. If battery checks good, check the charging system. With engine running at idle, put volt meter on battery-read volts, then rev engine to high idle. Volts should climb higher than idle reading.

Apr 18, 2011 | Yamaha YZF Thunder ace 1000 R Motorcycles

1 Answer

MTD yard Machine lawnmower,17hp Briggs And Stratton engine. Runs for about 15 or 20 minutes and stalls. It will not start again until I recharge the battery over night. Then only runs again for 15 or 20...


yes it could be

check your battery 1st , then check the stator a/c output

• 10 or 16 Amps DC regulated for charging
battery
• Two black leads (C) from stator
• Yellow connector (D) with two pin
terminals
• Two yellow leads (E) to regulator-rectifier
(F)
• One red lead (B) from regulator-rectifier
to red connector output lead (A)
• 10 and 16 Amp systems use the same
stator, color coding and regulator-rectifier
• Alternator output is determined by the
flywheel alternator magnet size


The stator and regulator-rectifier are the same
for the 10 and 16 Amp systems. The system
output is determined by the flywheel magnet
size.
Test Alternator Output
1. Temporarily disconnect stator wire
harness from the regulator-rectifier.
2. Insert RED test lead (A, Figure 28) into the
V ω receptacle in the meter.
3. Insert BLACK test lead (B) into COM
receptacle.
4. Rotate selector to AC Volts position.
5. Insert RED (A) and BLACK (B) test lead
probes into output terminals (D & E) in
YELLOW connector (C). (Test clip leads
may be attached to either terminal).
6. With the engine running at 3600 rpm, the
output should be no less than:
• 20 volts - 10 Amp System
• 30 volts - 16 Amp System
7. If No or Low output is found, check for
bare wires or other defects. If wiring
defects are not found, replace the stator.
voltage depending on alternator type and magnet size

then check the regulator / rectifier , make sure it is grounded properly

make sure battery earth lead is good

i suspect loss of bat voltage is letting the afterfire solenoid close off the main jet

let me know model and type codes off engine & i will try help further

cheers

Aug 29, 2010 | Briggs & Stratton Garden

2 Answers

Battery went flat even after riding for hours. showing 12.7 volts. When ran engine with revs it measured 12 .22. Think it must be rectifier. What should be output with engine running on 2001 softail duce


Proper battery charging will show ~13.5 to 14.5 volts at the battery terminals. Check for continuity through the alternator windings, check each diode in the rectifier stack and look for a voltage regulator which may be defective.

Oct 23, 2009 | 2003 Harley Davidson FXSTD Softail Deuce

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