I have Le Mans Mk III had similar problems with oil light switch! I fitted an electronic oil pressure guage and sender unit. Pressure gauge fitted beautifully into the space of the useless voltage gauge. I know exactly what my oil pressure is. used 12 mm 1.5 banjo bolt and banjo, braided hose to oil pressure sender unit mount near flasher unit. Incidently also had the alternator rewound to provide 40 amps of charge.
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Re: Oil pressure switch again
After about a month this new switch shat its self and spewed oil every wherefortunately it was in my drive way and not on a runthis switch was then replaced with another from Stein Dinse and now this one appears to be on the way out ie slow oil leak from switch, I was wondering if anyone has had experiance with these switches failing and to warn others of these switches, it could result in an engine seizure or was dropping your bike from oil on the back wheel,I got completely fed up with the oil pressure switches. Wash the bike and they go out...ride in a hard rain and they stop working, maybe they'll start spewing oil all over the place. Good grief, I was changing them out more frequently than my tail light bulb. ,,,
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Hi Mark, to check for normal engine oil pressure, make sure the engine oil level is between the add and full marks on the dipstick. Remove the oil pressure sending unit, located on the right engine case, behind the oil filter mounting bracket, and replace/plum in a known good mechanical gauge that reads 0 to 40/50 lbs. Start the engine and run it until the engine oil reaches normal operating temperature of 230 degrees. At 1,000 RPM the oil pressure should be 2 to 4 lbs. at 2,000 RPM the oil pressure should be 30 to 38 lbs. Good luck and have nice day. firstname.lastname@example.org
Oil light switch is a normally closed unit so first off test with an ohmmeter to see if there is an open which would not complete the circuit not allow the light to work.Then check to see if there is any current to the oil switch. If there is you could jumper the wire to ground which if the light then goes on indicates that the switch is bad. If no current to the switch you will have to trace back and find out where the open in the circuit is.
There may be no oil pressure due to lack of oil or a faulty oil pump. Check the oil level and add oil if low, then restart the engine and verify that the oil pressure light goes off and that the oil gauge indicates pressure. If the problem still exists you will need to check out the oil pump.
If the gauge shows oil pressure but the light does not go off it may be that the contacts in the pressure sending unit are not opening to break the circuit and shut off the light.
If the gauge does not show pressure it may be that the variable resistor in the sender is shorted to ground.
Locate the oil pressure sending unit on the front right side of the crankcase and verify that the electrical connector is properly connected to the sending unit. If the oil pressure gauge indicates pressure but the low oil pressure light remains on remove the electrical connector from the oil pressure sending unit and using a small jumper wire place one end on the indicator lamp terminal (the closest to the latch on the sending unit) and place the other end on the crankcase. The Ohmmeter must read less than one ohm. THEN start the engine and run at a fast idle. The ohmmeter must read infinity (OL). Replace the sending unit if the above meter readings are not obtained.
If the low oil pressure light functions correctly, but the pressure gauge does not, remove the electrical connector from the oil pressure sending unit, turn the ignition switch to IGNITION and the gauge must read zero. Ground the (BN/GN) wire terminal to the crankcase. The gauge must read full scale (60 PSI). Replace the sending unit if the above gauge readings are obtained but if the gauge readings are not obtained, replace the pressure gauge.
If there is no power to the gauge diagnose the cause could be broken or disconnected leads to the gauge or an open gauge winding. Test by switching the ignition switch to IGNITION and verify that 12VDC is present at "+ terminal on the gauge, then with the ignition switch turned to OFF check the ground terminal for continuity to ground. Replace the gauge if 12VDC is present and ground terminal is grounded. If 12VDC is not present, trace wiring until disconnected or broken wire is found and repair as necessary. If ground terminal is not grounded, repeat the procedure used to trace a for 12VDC lead.
The power lead fro the oil pressure and neutral switch is an orange wire on pin 6 of a 10 pin connector.
Hi Anonymous, I have no clue what you are talking about, but on the off chance you mean speedometer or security alarm go to www.fuelmotousa/harleycodes.html and www.harley-davidsonforums.com/forums/electrical/32977 Good luck
Hi Anonymous, start by checking oil level in tank and make sure it is between the add and full mark. With engine at normal operating temperature 180-230 degrees and the use of a 10 micron synthetic media oil filter, oil pressure will be 30-38 psi at 2,000 RPM and 3-5 psi. at idle. The oil pressure light is designed to come on at 2 psi. or less. To accurately test oil pressure remove oil pressure sending unit and install known good oil pressure gauge that reads 0-50, there might possibly be some plumbing required for hard to access points. If you are out in the middle of nowhere and there is no cell phone service and your oil pressure gauge isn't working and your oil pressure light is burned out, despair not, you still have one last line of defense left HYDRAULIC LIFTERS, as long as those tireless workers are quiet, you have oil pressure, maybe not much, but enough to get you down the road at a slow to moderate speed using the least amount of RPMS as necessary. As far as the volt meter is concerned it would appear that there is a faulty ground somewhere in the charging circuit. For a free wiring diagram please visit the website below and good luck. Harley Davidson Wiring Diagrams and Schematics
The oil light is not an indicator that the oil level is low, its is an indicator that your oil pressure is low.
A dirty oil filter will make your engine loose oil pressure.
Of course no oil in the motor will also cause no oil pressure.
If you have the correct oil level and a new oil filter, and your oil light is still on.
Check that your oil pressure switch/sensor is working.(your oil light wire will go to the switch/sensor).
If your oil level is fine and the oil filter is clean and the oil light switch/sensor is good and the oil light still comes on, that is a sign that your oil pump isn't working correctly, and would have to be taken apart to see why.
Check the simple and less expensive stuff first, hopefully it will be one of those
The "red engine light"? I'm not familiar with this. I know there is a red oil pressure light on the dash. If you "engine stop switch" is in the off position, this light will not light up on most models. This should disable your starter as well if I'm correct. Still, if the ignition switch is on, engine not running, and the oil light is not illuminated, check the "run-stop" switch on your handlebar controls.