Paul Carr
XS650 Enthusiast
I am rewiringa 1974 what purpose is the diode ...what does it do
Thanks
Paul
Thanks
Paul
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What does the diode do
- Thread starter Paul Carr
- Start date
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- Tags
- electrical
A diode is a check valve for electricity. It only allows current to flow one way. That's all I got for ya.
Which diode? There are 6 in the regulator (they rectify the AC alternator output) and (I think) one in the tail light wiring so that when you use the "park position" on the key switch the tailight circuit doesn't back feed the headlight. There may be others.
jayel
#9 Guru 74 TX650A
pamcopete
Ride.Enjoy.Life is Simple
Well, to continue what jayel was starting to say, the diode is used to turn on the brake lining warning light when you start the engine as a test of the brake lining warning light bulb. If the diode was not there, then if you did have a low brake lining and it closed the low brake lining warning switch, that would start the engine. Very complicated. Probably the reason that Yamaha stopped all that nonsense the next year.
No idea why Yamaha thought that warning you of a low brake lining was so damn important. But, whenever something comes along that is really stupid, like a low brake lining warning, I always assume that a lawyer or two was involved. In this case, Yamaha probably suffered a law suit from some total idiot that had an accident because his rear brake lining was low, like, he was too stupid to feel that the bike didn't stop like it did when it was new and he plowed into something and got hurt, so the lawyers at Yamaha became engineers and installed the low brake lining warning light to prevent future law suits. Then they came to realize that some really bad things could happen if the front brakes didn't work too good because the disk brake pads were worn down, so now they would have to put a warning light for that too, and if the rider ran out of gas while passing a semi on a two lane road, he could get hurt, so we better install a low fuel warning light, and if the tires were low and he had a blowout, he could really get hurt so we need a warning light for low tire pressure, and if the alternator failed and caused the engine to quite at a bad time, that could really be messy, but if we are going to put a warning light in for the charging system, it will have to have it's own battery because if the charging system failed, there won't be enough power to operate the charging system fail light, but then we would need another light to tell the rider when the back up battery for the charging system fail light, failed....
Cooler heads prevailed and they just eliminated the low brake lining warning light and fired the lawyers.
This is what caused the Air France AirBus 330 flight 447 to take a dive into the Ocean on its way to Paris from Rio de Janeiro. The lawyers and teenage programmers just installed a warning light and loud noise maker for any problem that they couldn't figure out, because they weren't pilots. The result was the three pilots were completely flummoxed by all the noise and bright flashing lights that came from the program that couldn't figure out what was happening. It's called cover your ass, and the lawyers and teenage programmers are still collecting their pay, except that the teenage programmers are now old enough to drink, so stay away from the AirBus A380.....
No idea why Yamaha thought that warning you of a low brake lining was so damn important. But, whenever something comes along that is really stupid, like a low brake lining warning, I always assume that a lawyer or two was involved. In this case, Yamaha probably suffered a law suit from some total idiot that had an accident because his rear brake lining was low, like, he was too stupid to feel that the bike didn't stop like it did when it was new and he plowed into something and got hurt, so the lawyers at Yamaha became engineers and installed the low brake lining warning light to prevent future law suits. Then they came to realize that some really bad things could happen if the front brakes didn't work too good because the disk brake pads were worn down, so now they would have to put a warning light for that too, and if the rider ran out of gas while passing a semi on a two lane road, he could get hurt, so we better install a low fuel warning light, and if the tires were low and he had a blowout, he could really get hurt so we need a warning light for low tire pressure, and if the alternator failed and caused the engine to quite at a bad time, that could really be messy, but if we are going to put a warning light in for the charging system, it will have to have it's own battery because if the charging system failed, there won't be enough power to operate the charging system fail light, but then we would need another light to tell the rider when the back up battery for the charging system fail light, failed....
Cooler heads prevailed and they just eliminated the low brake lining warning light and fired the lawyers.
This is what caused the Air France AirBus 330 flight 447 to take a dive into the Ocean on its way to Paris from Rio de Janeiro. The lawyers and teenage programmers just installed a warning light and loud noise maker for any problem that they couldn't figure out, because they weren't pilots. The result was the three pilots were completely flummoxed by all the noise and bright flashing lights that came from the program that couldn't figure out what was happening. It's called cover your ass, and the lawyers and teenage programmers are still collecting their pay, except that the teenage programmers are now old enough to drink, so stay away from the AirBus A380.....
Last edited:
jayel
#9 Guru 74 TX650A
the warning light was to alert you to what the metal on metal grinding noise from the back wheel was
@ pamcopete and jayel
