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+--- Thread: Oil light led (/showthread.php?tid=4319)
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Oil light led - norton1974_imp - 10-31-2022
Is there a repair option for replacing low pressure light led in the tach?
Light never worked and switch checks good.
Have not checked wire , that is next on list
Thanks,for your time
GR
RE: Oil light led - pekingduck - 10-31-2022
Funny you should ask, was just working on a set of instruments today.
Unplug the white 6-pin connector inside the headlight case, and, on the harness side, check for a ground on the blue wire with the red tracer. The switch is normally closed, and provides the ground to the indicator. The power to the light is on the circuit board that feeds the rest of the instruments.
If you need to take the instruments apart to check wiring, unbolt the whole assembly's 2 bolts under the top clamp, and lay it all on a big towel on the dining room table. There are about 25 screws to get to the last part of the wiring that plugs into the circuit board.
The LED is on the inside of the circuit board of the tach itself, held on by one screw, but you would have to pull the tach needle off to access it, and unsolder the LED. No spec on the LED values, or diagram of the printed circuits are available. Hopefully the problem is a poor or open connection somewhere.
If it's deemed not easily repairable, I'd drill a hole in the center steering nut for a nice big red LED, run one wire to any switched-on power, and the ground to the oil pressure switch. The early Japan market CB750s had a nice big red light as a speed warning.
RE: Oil light led - norton1974_imp - 11-02-2022
Hello,thank you for your reply.Funny you should ask, was just working on a set of instruments today.
Unplug the white 6-pin connector inside the headlight case, and, on the harness side, check for a ground on the blue wire with the red tracer. The switch is normally closed, and provides the ground to the indicator. The power to the light is on the circuit board that feeds the rest of the instruments.
If you need to take the instruments apart to check wiring, unbolt the whole assembly's 2 bolts under the top clamp, and lay it all on a big towel on the dining room table. There are about 25 screws to get to the last part of the wiring that plugs into the circuit board.
[/quote]
Thank you,great idea useing steam.
Will check wire in h/l bucket first
Thanks and cheers
Any ship can be a mine sweeper.
Once
RE: Oil light led - norton1974_imp - 11-08-2022
Hello, the oil pressure wire checks out from switch to plug.
what supplies the power for light ?
White connector shows 6wire white plug.
However only 5 wires are used.
One is blocked with a plug
Wireing diagram shows green ground wire
That is not present.
Any thoughts?
Thanks for your time
Gr
RE: Oil light led - pekingduck - 11-08-2022
(11-08-2022, 10:00 AM)norton1974_imp Wrote: Hello, the oil pressure wire checks out from switch to plug.
what supplies the power for light ?
White connector shows 6wire white plug.
However only 5 wires are used.
One is blocked with a plug
Wireing diagram shows green ground wire
That is not present.
Any thoughts?
Thanks for your time
Gr
White 6-pin connector only uses 5 of the pins. Green ground wire goes to the gray 8-pin connector, so not likely a problem. There is a sub-harness that the 3 plugs in the headlight lead to, but you will have to take the meter off the bike and put it onto a table to work with. Then you can test continuity on the dark-blue/red wire trough this sub-harness. if it's good, plug the white sub-harness connector into the connector in the headlight, and check that wire to ground. If it's got continuity, then it looks like the LED may be bad, which is very rare.
RE: Oil light led - norton1974_imp - 11-11-2022
Hello.
thank you for your help.
this clears a lot .
bike has 9500 miles on it and
i find it hard that led is blown.
this project should kill an afternoon.
Tally Ho
Gr
RE: Oil light led - pekingduck - 11-11-2022
(11-11-2022, 08:13 AM)norton1974_imp Wrote: Hello.Good luck. Let us know how it goes.
thank you for your help.
this clears a lot .
bike has 9500 miles on it and
i find it hard that led is blown.
this project should kill an afternoon.
Tally Ho
Gr
RE: Oil light led - norton1974_imp - 11-11-2022
Hello, as I have only had this bike for a few months, I am not familiar with the wiring on it.
Do I need to remove the fuel tank to get with the plugs on the other side of the wires?
I have the Honda shop manual , and that is not covered.
Any advice would be greatly appreciated.
Thank you in advance.
GR.
RE: Oil light led - pekingduck - 11-11-2022
(11-11-2022, 10:52 AM)norton1974_imp Wrote: Hello, as I have only had this bike for a few months, I am not familiar with the wiring on it.
Do I need to remove the fuel tank to get with the plugs on the other side of the wires?
I have the Honda shop manual , and that is not covered.
Any advice would be greatly appreciated.
Thank you in advance.
GR.
No need to take off tank. the 3 connectors from the meter all go into the back of the headlight case and plug in there.
RE: Oil light led - norton1974_imp - 12-18-2022
(10-31-2022, 03:56 PM)pekingduck_imp Wrote: Funny you should ask, was just working on a set of instruments today.Hello,is the oil light power a different source than the light for the tach?
Unplug the white 6-pin connector inside the headlight case, and, on the harness side, check for a ground on the blue wire with the red tracer. The switch is normally closed, and provides the ground to the indicator. The power to the light is on the circuit board that feeds the rest of the instruments.
If you need to take the instruments apart to check wiring, unbolt the whole assembly's 2 bolts under the top clamp, and lay it all on a big towel on the dining room table. There are about 25 screws to get to the last part of the wiring that plugs into the circuit board.
The LED is on the inside of the circuit board of the tach itself, held on by one screw, but you would have to pull the tach needle off to access it, and unsolder the LED. No spec on the LED values, or diagram of the printed circuits are available. Hopefully the problem is a poor or open connection somewhere.
If it's deemed not easily repairable, I'd drill a hole in the center steering nut for a nice big red LED, run one wire to any switched-on power, and the ground to the oil pressure switch. The early Japan market CB750s had a nice big red light as a speed warning.
Blue wire with red ground good up to the gauge.