Search results

One last thing: the white wire that is going to the headlight relay from the alternator is the one that is alone at the plug (two are aligned and one is alone; that's the one). You can also find it in the plug to the rectifier and it's the middle one. Just like in the diagram!

First, the PTC205 diode is doing the job. Andf to make sure I won't break it again, I have put, on top of the clear plastic sleeve in which the diode is 'hidden', a 4 inches piece of flexible tubing, the one that we use to run moving cables like clutch and brake (for the old motorcycles). So...

I have checked the power consumption of the command circuit of the headlight relay (the circuit coming from the alternator) and it's 0.135 amp! So the PTC205 diode is largely sufficient for the job!

Some 35 years ago, I played a little bit with electronics so I still have parts in a box. I checked and found a PTC205 diode which is rated 2.5 amps / 1000 volts. It can withstand 80 amps for 16 milliseconds (that's short!). I don't think that the relay will pull that much juice in normal...

On top, the battery can dump 150 amps to the starter but I think that we are 'covered' as the other circuits are protected by fuses... At the end, though, it might be a better idea to have a smaller diode because, otherwise, if a problem occurs, the wires will burn instead of the diode; easier...

I looked at a video explaining how an alternator works and I understand what you mean. It puzzles me, though, that, since only one third of the alternator circuit is used (one white wire), it means that the relay receives pulses of direct current instead of the continuous current that would come...

I believe that this diode was placed there to avoid any feed back from the general circuit to the alternator. This could arrive only if there is a short in the headlight relay (only thing connected to this wire outside of the rectifier) and would surely damage the alternator circuit and...

Thanks CaptChrome. I had already checked the connectivity on the 3 wires and changing the side of my multimeter cables. I understand that a diode will conduct only on one side (that's its main fuction!). I had also checked with the diode tester. So I unplugged again everything near the...

And its function is to make sure that the headlight gets opened ONLY when the alternator is producing an electrical current, usually when the engine runs. That way, the headlight does not drain the battery when the engine is not running and the headlight is effectively opened when you need it!

BTW, the headlight relay has been verified and it works correctly.

Hi! According to the electric diagram, there supposed to be a diode somewhere in the path of the connection between the alternator and the head light relay. Anybody had problem with a blown one? I have checked the connectivity between the plugs on both side of this diode and it doesn't go...

Ok! I checked the behavior of my car when put the key and when I turn it and that's the same behavior as on my motorcycle. So I put back the gas tank, plugged it and started the motorcycle while measuring the voltage of the battery. As soon as the engine ran, the voltage rose to more than 14V...

This morning, I plugged directly the starter solenoid to the battery and this treatment has awaken it; I did not hear a small click but, instead, the thing made a BIG clock. Next step was insuring that, now, the solenoid really closes the bridge between the two terminals and, yes, it does. Then...

I have the same problem and I found that the starter button on the handlebar has a ground wire that goes back to the headlight pod but there is no ground wire on the other side of the plug. Weird because the plug has 6 holes and only 3 are used on the battery side! I added a ground connection...

One thing though, I still have the battery being drained by the regulator / field wiring when both are connected to the circuit. As you say, I will have a look at the wiring under the cover.

ok thanks. By looking at the diagram, I could figure that putting the gearbox in neutral would put this switch to ground so the other one had to be in the same state for the safety relay to do its job. I now have electricity everywhere; when I turn the key, all the needed lights show their...

I have disconneted the plug that goes to the oil switch (Y), the neutral switch (L), to the field of the alternator (B) and back to the voltage regulator (G) and found that I could replug the regulator without any loss of voltage; this means that the problem is coming on the engine side of the...

Hi My 1981 XS400 had run perfectly lately but, yesterday, when I turned the key, there was nothing; no lights no power to the starter. I checked the fuses, no problem there. I checked the battery and it was showing 12,45V. SO I figured that I must have a short circuit somewhere to have all the...

Hi. I just read that batteries like the MightyMax have to be recharged with no more than 14,4V and at a small Amp rate. The voltage regulator on this Yamaha will allow up to 15V which will gradually kill the battery. I don't have any experience with this type of battery but it is said that we...