New LED Gauges


Information and questions on GL1100 Goldwings (1980-1983)
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krabbyboy238
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New LED Gauges

Post by krabbyboy238 »



Hello, I just purchased a 1982 Gl1100 a couple of months ago. I have been restoring it. I just replaced the original gauges with two mini gauges from dime city cycles. I wired them up and all lights are working correctly. Although, I am having one problem. The oil light on the gauge does not turn off completely. When the bike is off the oil light is bright. When I start it up the oil light gets dimmer, but does not turn off completely. At first I thought the problem was with the sensor, but I hooked up a regular bulb to the circuit and it turns off completely when the bike is started up. I am a beginner with electrical, but my theory is that the led in the gauge requires less power so it does not turn off completely because there is still some power left in the circuit. Is there some kind of resistor I would need to fix this. If so what type. Sorry I have never really dove into electrical. I am just learning. Any help would be greatly appreciated.
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Re: New LED Gauges

Post by WingAdmin »

It's because there is enough carbon in the engine oil to cause the switch to conduct "a little bit" when it is off. With the regular factory gauge, this isn't an issue, because it takes a reasonable amount of current to get an incandescent light to light up.

Not so with LED's: they require VERY little current, so even a little leakage will cause it to light up.

You'll need to put a small resistor in series with the oil pressure switch, in between the switch and the gauge. The size of resistor will depend on the sensitivity of the LED circuit already in the gauge. You can't hurt it with a wrong size, I would start with say a 100 ohm resistor and move from there if needed. If it still lights up when the engine is running with 100 ohms, try 200 ohms. If it doesn't light up at all anymore, try 50 ohms.
krabbyboy238
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Re: New LED Gauges

Post by krabbyboy238 »

Thank you. I will try all 3 and report back.
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DenverWinger
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Re: New LED Gauges

Post by DenverWinger »

Might have better luck with a "Pull-Up" resistor. Connect Oil Pressure LED connection direct to the switch. Use a 1000 ohm resister connected between the oil pressure switch lead and Positive power to the gauge set. The resistor pulls the voltage on the oil switch terminal to 12v causing the LED to go completely OFF when oil pressure is present and switch is open, overcoming the small current leakage in the switch, 12mA (0.14 watt) thru the resistor when no oil pressure and switch closes, LED sees ground and lights up fully. Doubtful the Oil switch conducts enough when open that a lower resistance value will be needed.
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Re: New LED Gauges

Post by MikeB »

The original poster has said that he is just learing about electronics. I doubt talking about a pull-up resistor is going to help him much but I may be wrong.
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krabbyboy238
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Re: New LED Gauges

Post by krabbyboy238 »

I just tried a 100 ohm resistor and a 180 ohm resistor with no change in brightness on the gauge. Is there some way for me to calculate what rating resistor I will need? I saw someone mentioned a pull up resistor. I am not familiar with those, but I can look into them if need be. Thanks for all the information, I really appreciate the help.
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Re: New LED Gauges

Post by MikeB »

You can double, triple or quadruple the starting resistor size with no ill effects and give it a try. A resistor larger than 100 ohms will no doubt be necessary. You could even try a 1000 ohm resistor and see how it works.
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1998 - GL1500 w/184,500 miles ~ 2017 - GL1800 w/13000 miles
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Re: New LED Gauges

Post by DenverWinger »

The term "Pull-up" doesn't mean any special resistor, it just describes the circuit connection.

Skip the resistors you've been trying in series with the lead from the LED Oil Light and connect it direct to the Oil switch. Then connect a 1000 ohm resistor between the line to the oil switch and the main positive power lead to the gauge unit.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark
krabbyboy238
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Re: New LED Gauges

Post by krabbyboy238 »

So I am kind of at a loss here. I just got a 1000 ohm resistor and hooked it up in between the positive power gauge wire and the positive oil pressure wire. It did nothing. I tried hooking it up in series and it did nothing as well. I then put 8 1000 ohm resistors in line and it dimmed the oil light when the engine was not running, but there was no change in brightness when the engine was running. I then put 15 1000 ohm resistors in line and now there is no change in brightness when the engine is off and when it is on. I am probably just missing something stupid. I almost just want to hook up a regular bulb to the oil pressure circuit and mount it under the tank. so I can reliably know if I have oil pressure. As I said before I am really a complete beginner to electrical, so there could be something wrong I am doing on my end. I appreciate all the help.

These are the resistors I ordered
https://www.amazon.com/gp/product/B07HD ... UTF8&psc=1

Edit: Could it be possible that the oil pressure sensor is malfunctioning? Could it be giving enough power while running to light up the led but not the Incandescent bulb?
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Re: New LED Gauges

Post by DenverWinger »

krabbyboy238 wrote: Thu Dec 24, 2020 2:02 am Could it be possible that the oil pressure sensor is malfunctioning? Could it be giving enough power while running to light up the led but not the Incandescent bulb?
There's no power coming from the oil pressure sensor, it is just a switch.

Let's see if your Oil pressure LED is working correctly: With no resistors connected anywhere and the wire for the LED disconnected from the oil sensor, turn the key on. The Oil LED should be completely dark. Then ground the wire that's supposed to go to the oil sensor. The LED should come on brightly.

Try that and report back... :)
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark
krabbyboy238
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Re: New LED Gauges

Post by krabbyboy238 »

Just did it. I disconnected the negative wire and the light did not function. When I reconnected it, it lights up normally.
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Re: New LED Gauges

Post by MikeB »

This is a functional diagram of an oil pressure switch.


All the oil pressure switch does is provide a ground to the light circuit.
The light gets its power when the ignition switch is turned on.
The ground for the light comes from the switch.
As oil pressure builds to a point above the set point of the switch, commonly 3 psi, the switch in the pressure switch opens. This removes ground from the light and the light should go out.
You may need to test the switch.
There should be an infinite (or very high) resistance between the contact on the oil pressure switch and ground when the engine is running. Conversely, there should be a very low resistance, a couple of ohms, between the contact on the oil pressure switch and ground when the engine is off.
If your oil pressure light is staying on at all times, it must getting ground from somewhere other than the switch IF the switch tests good.
MikeB
1998 - GL1500 w/184,500 miles ~ 2017 - GL1800 w/13000 miles
USAF Avionics Communications Tech - 1968 - 1986 / Flight Engineer C-130E - C-141B - 1986 - 1992. Retired
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DenverWinger
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1972 CL350 (1980-1988) sold
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1977 GL1000 (2002-2006) sold

Re: New LED Gauges

Post by DenverWinger »

So with the LED oil sensor line connected to the switch the LED glows bright, but still glows dim with the engine running?

Connect a 1000 ohm resistor to the switch along with with the wire from the LED, the other end of the resistor to the Positive power lead for the gauge unit. Should make the dim LED go dark with engine running but light full brightness with engine stopped.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark
krabbyboy238
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Re: New LED Gauges

Post by krabbyboy238 »

Yeah I tried the 1000 ohm resistor with no luck. Interestingly when I was hooking everything back up the oil light went back to normal. When I had the bike running the light was functioning as normal. Now it is doing the same thing as before, but it is a little dimmer. I am gonna replace the oil pressure switch, I think that is what is causing my issues. I appreciate all the help from you guys. Thanks.


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