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Tyre Ratings & Best Tyres for Road Use — With Real Vehicle Examples

1. Tyre Ratings: What to Look For These ratings appear on the tyre sidewall and help you judge quality, safety, and performance. Treadwear Rating This tells you how long a tyre is likely to last. The higher the number, the longer it should last. A treadwear of 400 means the tyre will last about 4 times longer than a baseline test tyre. Traction Rating This shows how well the tyre grips on wet roads. The grades are: AA (excellent), A (good), B (moderate), and C (poor). Temperature Rating This tells you how well the tyre resists heat. High heat resistance means the tyre won’t overheat and burst at high speeds. Grades: A (best), B, and C. Load Index This number shows how much weight one tyre can safely carry. You must match this to your vehicle's weight class. Speed Rating This tells you the maximum speed the tyre can handle safely. For example, H = 210 km/h, T = 190 km/h, etc. 2. Best Tyres for Personal Vehicles (By Model) a. Toyota Corolla / Honda Civic Recommended Tyre: Michelin Pr...
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Alternator Testing using multimeter.

Rotor tests  Check the rotor for an open circuit by measuring for resistance between the slip rings. Some resistance less than 5 ohms indicates continuity. If there is no continuity infinite 0 ohms. If not, replace the rotor.

·         Check the rotor for grounded circuits by measuring for resistance between the rotor and slip ring. Any amount of resistance indicates ground continuity. The resistance should be infinite 0 ohms. If not replace the rotor.

 Stator tests  Connect ohmmeter between any stator lead and the frame. In normal condition resistance should be infinite whereas very low resistance indicates ground circuit .the same test may also be done with a test lamp. Normal condition would be indicated by no light, whereas if the lamp lights, it indicates open circuit.

·         Connect ohmmeter across any pair of stator leads. Less than 0.5 ohms resistance indicates stator is okay. Whereas any high reading would mean open circuits.

 Diode tests  Connect ohmmeter across the diode to be tested and then reverse leads. A normal diode would show low reading one way and high reading the other way.

However, in case both readings are low, it means that the diode is short- circuited. Whereas both readings would indicate the open circuit.




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