Strange side effect of LED dash conversion???


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aj1500
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Strange side effect of LED dash conversion???

Post by aj1500 » Tue Nov 27, 2018 2:10 pm



So I did the dash mod to LED lights, I also pulled and did a complete rebuild on the front forks and replace the front tire as well. I cut the wires to my low fuel light and wired the light to the relay I'm using to transfer gas from the sidecar to the bikes tank so it lights up on the dash when I'm transferring fuel
anyway now my cruise won't set any faster than 71 MPH. it doesn't matter what I try it just won't hold over 71
it also won't advance with the button to get it past 71
any ideas what I could have done to cause this as it was fine before I did all the work



DaveO430
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Re: Strange side effect of LED dash conversion???

Post by DaveO430 » Tue Nov 27, 2018 2:21 pm

I have heard the cruise will not work with an LED in the light, maybe it has some effect on the speed. I do know the low fuel light will not work with an LED in it.

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AZgl1800
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Re: Strange side effect of LED dash conversion???

Post by AZgl1800 » Tue Nov 27, 2018 2:35 pm

aj1500 wrote:
Tue Nov 27, 2018 2:10 pm
I cut the wires to my low fuel light and wired the light to the relay
right there is where you screwed it up.

the Low Fuel Light is a series circuit from the sensor to the lamp. ( and if you put an LED here, it won't work period )

that sensor is a very small resistor that changes value when the gas uncovers it,
and it no longer is cooled off.....

when you added a new load to it, the light will never work, you shorted out the sensor.

Put it back the way it was, do not ever mess with the Low Fuel Light sensor wiring.
~John

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Alan_Hepburn
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Re: Strange side effect of LED dash conversion???

Post by Alan_Hepburn » Tue Nov 27, 2018 2:38 pm

John, I think his issue is with the cruise control, not the low fuel light. He's using the low fuel light as an indicator for an external pump to transfer fuel from his sidecar into the bike.
Alan Hepburn - San Jose, Ca
1994 GL1500SE with a California Sidecar

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aj1500
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Re: Strange side effect of LED dash conversion???

Post by aj1500 » Tue Nov 27, 2018 3:03 pm

OK let me clarify
I did NOT put LED bulbs in the cruise on/off or set indicators
I simply eliminated the low fuel circuit to the bulb by removing the socket and wiring it to another relay
I don't need the low fuel light but I can't tell you how many times I have forgot I was transferring fuel because the only light was in the switch and it is at my knees and was the same color as the switches for my added lights

my problem is the cruise won't go over 71 MPH now

thanks for the responses

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curtm
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Re: Strange side effect of LED dash conversion???

Post by curtm » Tue Nov 27, 2018 7:35 pm

Low fuel light is controlled by a thermister in the tank, as the fuel level drops and as the thermister heats up the resistance decreases causing the light on the dash to illuminate
Curt

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DenverWinger
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Re: Strange side effect of LED dash conversion???

Post by DenverWinger » Tue Nov 27, 2018 10:16 pm

He disconnected it from the thermister so it could be put to other use, not related to cruise control.

What size is the rear tire? Smaller than spec? That could change the top speed of Cruise.

There's mods you can do to fool the cruise control into having a higher top speed....

viewtopic.php?f=14&t=41908
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AZgl1800
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Re: Strange side effect of LED dash conversion???

Post by AZgl1800 » Tue Nov 27, 2018 11:36 pm

DenverWinger wrote:
Tue Nov 27, 2018 10:16 pm
He disconnected it from the thermister so it could be put to other use, not related to cruise control.
I missed this critical part of what he did.... so my explanation is now worthless.
Other than, as above, originally it used the thermistor to light the bulb....

But, in his case, that is never a problem now, he just wants to know IF the fuel transfer pump is running.

I can well appreciate this as I used to have a spare fuel tank in a '74 Suburban, it held 50 gallons.... and I used a fuel transfer pump to drop fuel into the OEM gas tank.

"my expert opinion" told me that when the fuel gauge get over 3/4 tank, shut the damn thing off....

well, guess what? I pumped at least 25 gallons on the ground on a very long vacation trip when I was broke and really needed that gas. I had bought it super cheap at home, knowing that 3 states over it was twice as much as around my home. :evil:
~John

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aj1500
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Re: Strange side effect of LED dash conversion???

Post by aj1500 » Wed Nov 28, 2018 8:33 am

rear tire has nothing to do with speedometer or cruise as it runs off the front tire
so here is a little more, I run double dark, every since I wend dark on front my speedo has been spot on with correct speed. this is checked against my GPS and many here's your speed radar signs. my front tire began splitting in the treads so I decided while I had it down I would do all the other work, the cruise worked perfectly fine and I could easily rely on it to set at 75 with no issues
once all the work was done it now WON'T set above 71 and I just can't grasp what I might have done to cause this or is it just a coincidence

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MikeB
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Re: Strange side effect of LED dash conversion???

Post by MikeB » Wed Nov 28, 2018 12:38 pm

Were you ever able to set the cruise speed above 75 or 80 mph? If not, then you present situation is typical of all GL1500's.

Look at this post: viewtopic.php?f=14&t=41908

I made the modification back in 2001. Setting the cruise at 80 plus has not been a problem since.

Of course, prior to that mod, 71 to 73 mph was the best my GL1500's could ever do.
MikeB
Tacoma, WA, USA

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aj1500
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Re: Strange side effect of LED dash conversion???

Post by aj1500 » Wed Nov 28, 2018 3:05 pm

I have never tried to set the cruise at 80 MPH but could set it at 75 without fail since I bought the bike

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MikeB
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Re: Strange side effect of LED dash conversion???

Post by MikeB » Wed Nov 28, 2018 3:16 pm

Did you install the same size and manufacture tire when you changed it? How does your speedometer and GPS speeds compare now?

I can only assume that your change in cruise control operation has something to do with that new tire you installed.
MikeB
Tacoma, WA, USA

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AZgl1800
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Re: Strange side effect of LED dash conversion???

Post by AZgl1800 » Wed Nov 28, 2018 4:10 pm

Typically, the 1500s will not set the CC higher than approx 77 mph.

there is a fix for that, if you want it,
swap wires 4&5 to the ECM and it will go past 100 and still set. ( in 5th gear )

that makes the ECM think the bike is in 4th gear, and allows the RPMs to go higher for the same speed, thus allow for the higher road speeds with CC on.


~John

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