I have a Mazda 626, 2000 cmc, from 1984. I can't start the engine. The voltage of 12V which must be on the alternator when the contact is ON is not there. The fuses are ok. Probably there is a relay between, which stops the voltage to be on alternator, but I don't have the technical book. Please help me with some advice. Thank you.
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Re: mazda 626 - engine do not start
Have you tried jumping the engine directly? It wont fix your problem permanently but might get the car started and give you a better idea of what is wrong. connect the negative cable to the engine block and the positive to the battery, good luck hope this helps
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by new battery you mean brand new off the shelf in which case the voltage would have been 12.5volts and not 11.5 volts. battery voltage will drop while cranking an engine but should recover to 12 volts when stopped. The alternators charge directly to the battery by the red wire from the back of the alternator to the positive terminal of the battery. The other smaller wires are for the regulator control and charge lights. Take the vehicle to an accredited auto electrician to have the fault rectified.
What they mean is there is no obvious problems. What else runs off that belt? Check for misalignment there. What makes it break? Does it happen after a long trip ( 2 hrs. highway driving) or at timed intervals ( every month, 6wks)?
Carefully check all the pulley's for sharp edges or bump outs into the belt. If you find anything use a small file and smooth them out. They can cut or pinch your belt and weaken it so it breaks over time.
Check the pulley alignment with the engine running where you can see all the pulleys and belts at the same time. This might mean crawling under the car. Vary the engine speed while you watch and take it up to cruising speed. You are looking for something to change, i.e a pulley to start wobbling. It could be a mounting bracket that bends at higher revs that needs to be replaced or strengthened.
Hope this helps.
Yes, I experienced the same thing with mine... you have to losen the 2 motor mounts on that side and lift the motor up about 3 ". I worked at a garage so I had access to an engine hoist. Try using a jack from underneath. Nice engineering from Mazda!!!
1st off you would give everything a good visual examination. Look for
loose alternator belt. Also look for wires that could have
become disconnected or cut that leads to the alternator.
Then you would hook up a volt meter to the battery cables and check the
voltage. After this you would start the engine and recheck the voltage.
The voltage on a charged battery should read around 12.5 volts. While
the engine is running turn on a few accesories and speed up the idle a
little the voltage should read around 14.5 volts.
If the voltage does not increase suspect either a faulty alternator or regulator.