The fault may be elsewhere. Next using a 12 volt automotive battery charger connect the positive lead to ground on the motorcycle or to the mounting stud on the diode. Lucas Fault Diagnosis Service Manual, Fault Diagnosis Service Manual, Lucas Service Manual. Modern Lucas Alternators The modern range of Lucas alternator components are powerful, well made and more reliable than the original parts. The fault may be elsewhere. If the needle shows no charge recheck all connections or components. Tighten the bolt with the small wrench. If one of the wires is open, that is there is no continuity or if there is continuity between any wire and the steel body of the stator then replacement is the only option. The 2 outer spades where the harness connects should have good continuity in only one direction with the spade between them. Check also that the dynamo actually turns when the engine is running, and that the drive belt is adjusted to its correct tension, and is not slipping (See Checking, adjusting and refitting drive belts ). Do not try to turn the rotor undersize to gain clearance. Never hit a rotor with a hammer to drive it on to the crankshaft. Subject. Battery voltage should be present on all plug(s) terminals (e xcept ground wire if fitted) If not, check cables and warning light bulb. A simple test of the unit can be made with a volt ohm meter. The zener diode is a brass looking affair mounted to a heat sink, usually under the tank or at the front of the bike. This unit is the most important and basic element of the power supply system for cars of various brands and models. Using a volt ohm meter check for continuity across the Diode. A quick test with my voltage meter indicated that there was no AC voltage in my battery when the motorcycle was … Learn how to test an alternator. When installing the rectifier it must be open to the cooling air. If there is continuity in both directions then the diode needs replacing. In addition the center stud must be grounded. When you have tested the charging system of a car fitted with an alternator , and the checks in How to test a car battery point to a fault in the voltage regulator , make sure that you need to replace it. The battery is needed to start the vehicle, which, in turn spins the alternator … The rectifier used by Lucas converts the AC current from the alternator to DC current to run the lights, ignition and charge the battery. There should dip in charge rate followed by moving back to positive above 2200 RPM. When routing the stator wires you must account for primary chain deflection. drop with heating and the alternator's output voltage would fall too much with heating. The early stators had open windings insulated from the steel ring they are mounted on by heavy card stock and a coating of varnish. These 2 wire stators (Lucas no 47205) are exactly the same as the three wire type in other respects. These can not be fixed, don’t even try. There should be good continuity between all of the stator leads and no continuity to the outer steel ring of the stator. Connect leads to the ammeter and install alligator clips on the ends. Here is a picture of a Lucas alternator rotor (the magnetic bit in the middle) and stator (the bit round the outside with the wires coming out of it) The rotor is … Either push the connector onto the terminal or place the eyelet onto the terminal and screw the bolt in with your fingers. They are under the battery so are often bathed in battery acid and engine oil, not the best combination. Title. Repeat the test using the screwdriver. A rotor that has been left open for years may have lost a substantial portion of its magnetism. Testing output on a running machine in this way. The 3 o'clock would have put them too close to the engine and spark plug wire, 6 o'clock would be harder for the If there is any detectable play the rotor is no longer usable. Alternators can be set to produce different voltages (12 volts is the most common for cars, but on larger vehicles a higher voltage is required). This will also demagnetize the rotor. If the tight spot moves when you rotate the motor either the crankshaft is bent or the rotor is loose on its center and about to fail. Start the bike. If you suspect a fault in the dynamo, check all the connections to it with a circuit tester. LUCAS, ALTERNATOR , 05 No load test - switch off ALL a 17ACR amp unit. The needle should show a charge of 1-2 amps at 2200. Tighten the bolt with the small wrench. The cable will be black, and the opposite end will attach to your car's body as it also acts as the ground. Set your volt-ohm meter on the 10 volt scale and connect the positive lead of the meter to the spade on the diode and the negative lead to the negative charger lead. If you have a 3 wire stator – either 6 or 12 volt, I suggest you connect the green/black and green/yellow wires together (check the wiring diagram for your bike to be sure) , connect them to one AC wire to a power box or the rectifier with the green/white to the other. Testing output on a Lucas ACR alternator A rotor should always be stored with keeper shoes encasing the magnets to preserve its magnetic properties. This movement chafes through the insulation and shorts the coil to ground. If you're into design, go and check them out. Check for clearance using stainless steel feeler gauges. Remove the center Brown/blue wire from the rectifier. A static test can be carried out on a stator as follows. Lucas simply rely on the internal impedance of their alternator to rapidly choke down the available output voltage as the zener comes on. The AC pulse in the stator lead will bleed over to the points lead and trigger rouge sparks from the ignition. If the rotor rubs the stator it will loose magnetism and possibly overheat and come apart. TC timing chain tensioner pivot pin E Lucas alternator: test procedures index hardware[ alternator rebuild workshop] wiring, the alternator or even a blown warning lamp bulb. The design of this site was heavily, heavily inspired by CSS-Tricks under their supercool licence. Turn the ignition key to the “on” position, but do not start your car. Now switch the lights on. The three-pin multiple plug has no earth terminal. To work out the wattage (rated output) multiply volts by amps and you get 110.25 watts. Lucas Fault Diagnosis Service Manual. As a bonus, the clearance between rotor and stator is 18 thou. Keywords. Check the stator coils as described above. On other systems, you may need to connect the battery and field terminals using a jumper wire while checking voltage output at the battery with the engine running. BSA fitted alternators to the B33 singles toward the end of production and to all machines in the range after 1962.Triumph used an alternator on the 5T for 1954 on and the Thunderbird from 1956. Open the hood of your vehicle. Next step is to check the battery voltage to make sure that AC from the Lucas alternator was not leaking past the rectifier to the battery. A simple test of a diode can be done as follows. It is usually square with five or six terminal screws on its face. The ammeter should show a discharge of 1-2 amps at idle speed. The rectifier is polarity sensitive and will be ruined if connected to a power source backwards, even for a very short time. Lucas Fault Diagnosis Service Manual. Checking the alternator output leads Check that all connections are secure. Start the engine and connect a voltmeter or tester across the battery terminals. Do this one more time so you will have checked clearance at 3 different crankshaft positions. It is most important that the diode be in the cooling air flow and on a proper aluminum heat sink. The RM25 can come as a conversion kit: alternator, rectifier, pair of matched zener diodes, wires, connectors, and spacers (for behind the rotor). Then, unhook the bar under the hood and use the bar to prop the hood up. If the rear of your alternator has a 'test tab', you need to short this tab to the alternator frame using a screwdriver while checking voltage output at the battery with the engine running. In the case of a 3 wire stator connect the Green/black and Green/yellow in common as one lead and the Green/white as the other. 2. The alternator system fitted to British bikes from the 1960 season is a very clever way to extract the most electrical power from the least amount of space while not having to completely redesign the primary drive.
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