LED oil pressure light

[Rob Valdez 79 R65]

Bob Roller said "On the subject of the diode in the tachometer, that is an engine over speed indication LED on the '79 model bikes. "


So if I replace that diode, my over-rev LED might start working again?

[Justin B.]

Monte, you have tested the switch and it appears to be functioning.  An easy way to check out the wiring is to ground the wire you pulled off the switch.  Doing so should light up the oil pressure light, if not then you have a wiring problem of some sort.

[Bob_Roller]

Bob Roller said "On the subject of the diode in the tachometer, that is an engine over speed indication LED on the '79 model bikes. "


So if I replace that diode, my over-rev LED might start working again?

Rob, it may be faulty, but it looks like there is a transistor in the circuit as well, so it could be either, and with an LED, failures are not that common.

I've never had the engine on my R65 any where near close to redline, I don't like the sound it produces when going 85 mph !!

[Rob Valdez 79 R65]

Bob Roller said "On the subject of the diode in the tachometer, that is an engine over speed indication LED on the '79 model bikes. "
So if I replace that diode, my over-rev LED might start working again?

Rob, it may be faulty, but it looks like there is a transistor in the circuit as well, so it could be either, and with an LED, failures are not that common.
I've never had the engine on my R65 any where near close to redline, I don't like the sound it produces when going 85 mph !!

I've been there a few times (could be what trashed my first engine!), unfortunately, I am usually too busy piloting to admire the glowing LED when it is activated!!!

[Ed Miller]

I've never had the engine on my R65 any where near close to redline, I don't like the sound it produces when going 85 mph !!

85?!  Mine sounds nice and smooth at 90, which is still not up to red line.  Then again, my heads are going off for some expensive valve work at only 60,000 miles.  It will be a 3,000 dollar bike after that.  But not for sale.

[montmil]

FINALLY!  [smiley=furious3.gif]  I refused to allow this simple little LED oil pressure warning light to defeat me. The thermometer in my shop read 103-105 for the days I messed with this bastid. The weather's hot and so am I. Really hot...

Thanks to all for your ideas, suggestions and underwear references. chuckle

I tested the OP sender and it appeared to be OK. Saved an unnecessary purchase. I tracked wiring. I made unkindly references about the parentage of the previous owner and his haphazard wiring mods. I read the manual and wiring diagrams... on and on, or so it seemed.

I located a useful and unused switched power source within the headlight shell. Likely a power source for optional instrumentation. I shoved a bare wire into the original connector and grounded the other LED lead on a fork pinch bolt. Light is working and lit up like Christmas.

Continued on with proper electrical connections, dilectric grease, neatly secured the wires, put the headlight back in place, turned on the ignition switch and... NOTHING! Jeez, Louise.

Frustrated, I yanked the whole LED harness outta the bike, tossed it in the tool drawer and returned to wet sanding the Cabriolet's fender flares... another ongoing project.

Middle of the night... woke up and thought to myself... "Self. Did you reattach the OP sender lead after testing the unit?"

Zero-Dark-Thirty this A.M. I'm in the shop. Cooler right now, and sure enough, the OE lead at the OP sender is dangling by the frame. Another Jeez, Louise moment. Now I'm casting dispersions on my own parentage. Guess Mom and Dad were swimming in the shallow end of the gene pool.

Plug in the sender lead, rewire the LED circuit for about the fourth or fifth time, took a deep breath and turned on the ignition... Urethra! It's alive. Engine off, light on. Engine on, light off. Jeez. . .  [smiley=1drink.gif]



See? Engine off and the OP light is glowing...  So far, so good.



D'Oh... Engine running and the light's off.
Like grandpa used to say, "Even a blind hog finds an acorn now and then." That be me.  

 

[Ed Miller]

Middle of the night, you're dedicated.  Well, obsessed!  Good job!

[montmil]

Middle of the night, you're dedicated.  Well, obsessed!  Good job!

Actually, school starts up again for my wife on the 18th and for me on the 20th of August. We can thank the Texas Legislature for continuing to add additional educational days. They haven't added any more money to the schools but, hey...

Minor rant. Sorry.

With my summer vacation rapidly winding down, I still have numerous items on my "To Do" list that aren't quite done. The OP light issue was one of many. And I doubt the neighbors were too thrilled when I cranked up my noisy, single-stage air compressor just at sun up in preparation for painting some Cabriolet parts. They be sleeping late on a Sunday morning. Sinful...    

[Justin B.]

Yeah, I was at work at 06:00 this morning...  I'm glad you got it sorted out, finally!  I'll mneed to find something else to rag on you about, now...  

[montmil]

...I'm glad you got it sorted out, finally!  I'll need to find something else to rag on you about, now...  

Well... My wife says I'm way over on the household's beer budget.  [smiley=beerchug.gif]