1990 HDJ81 - Orange light, Turbo, Dash

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Classic85

Classic85

10 Year 15 Year
Joined
Jun 12, 2010
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28
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186
Location
Texas
Does anyone know what this warning light is an indicator for. It is something I have not found in my manuals or web and am unsure what it related to.
It glows in various amounts of intensity as opposed to simply "turning on."

Orangelight.webp
 
I THINK the overboost threshold is actually 14.5psi, but only based on what I've read on MUD.

When you say the light "glows in various amounts of intensity", does it do this only when at or nearing max boost, or at random times? If it doesn't follow the pattern that would indicate the light is working as intended, I'd start checking for loose grounds.
 
On a stock HDJ81, according to the FSM (I looked it up just now, page BE-67 of the FSM), the green light should be on at or above 2psi, and the amber lights up at or above 11.9psi (lower than I thought). Stock boost is something less than 12psi, if the amber light comes on it indicates "overboost" from the factory settings.
 
IanB said:
On a stock HDJ81, according to the FSM (I looked it up just now, page BE-67 of the FSM), the green light should be on at or above 2psi, and the amber lights up at or above 11.9psi (lower than I thought). Stock boost is something less than 12psi, if the amber light comes on it indicates "overboost" from the factory settings.
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Two things one the turbo from what I understand is an upgrade installed by ATEB, and the exhaust is 3" all the way back, every indication is that it is tuned correctly at about 13.8 lb of boost. Green light is correct, starts right when the turbo starts to spool up, right on time. It does not follow a pattern, for example it does not get brighter as the turbo is increasing in boost. It does not get brighter when I am running maximum boost either. I will try and post a video taken in darker conditions to show what it is doing. And it it is not the "Flicker" issue from alternator failure.
 
These lights are either off or on, no varying intensity. Maybe ATEB modified it when they changed the turbo and upped the boost? Take a look at the wiring, the sensors are right by the air cleaner on the vacuum (boost in this case) hose off the turbo.
 
IanB said:
These lights are either off or on, no varying intensity. Maybe ATEB modified it when they changed the turbo and upped the boost? Take a look at the wiring, the sensors are right by the air cleaner on the vacuum (boost in this case) hose off the turbo.
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As it always happens when my IT guy finally shows up. I can never duplicate the issue I am having with the computer and he walks away saying "Well, I guess it's fixed then."
The light is not going off and on, now. Thanks Ian, I will double check for loose grounds tomorrow.
 
IanB said:
On a stock HDJ81, according to the FSM (I looked it up just now, page BE-67 of the FSM), the green light should be on at or above 2psi, and the amber lights up at or above 11.9psi (lower than I thought). Stock boost is something less than 12psi, if the amber light comes on it indicates "overboost" from the factory settings.
Click to expand...
I will check the high pressure switch for fault.
 
That amber "overboost" light shouldn't be on all the time, and it seemed to dim with the turn signal if I was seeing that correctly.
 
As the light seems to be lit all the time, I'm thinking ground issue.
 
Did this just start since your timing light bulb came on ? If so remove the rubber grommet on the instrument panel and trip the t belt reset, but get the belt done asap lots of bad can happen if it brakes. None of the other lights dim on the left or right signal. I'm thinking bad over boost bulb maybe. Kind of a pain to start there though. Does it dim when you add an excessory (wiper , heater , center difflock ,4way flashers etc ) or apply the brake lights , or even if you manually shift through the gears reverse too . There are a lot of grounds to check many of which are internal . I drowned a truck once and pulled every plug apart chasing many ground problems . If it only does it with the turn signals I'd pull that flasher unit first , then check a couple obvious grounds that are easily excess able. Then swap around your flasher units then pull your turn signal bulbs one at a time. Chasing electrical can be a royal pain and costly a simple test bulb tester between your battery and your positive watching the bulb draw glow down as you disconnect your culperts. Hope this helps.
 
Enigma said:
and you need to replace your timing belt....
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Ya ya, thanks. Ordered all the supplies from CruiserParts week before last, good customer service, parts should arrive tomorrow. I paid a little extra over CDan, but they had all the parts available so I thought I would spread the wealth. Now just need to set aside a few hours to change out the water pump and timing belt. I was going over my receipts and the last time the coolant was changed was at 172,000 km at that time they changed out all the hoses and threw in a new rad and rad cap, so I suppose I will have some extra parts for down the road.
 
wrongway around said:
Did this just start since your timing light bulb came on ? If so remove the rubber grommet on the instrument panel and trip the t belt reset, but get the belt done asap lots of bad can happen if it brakes. None of the other lights dim on the left or right signal. I'm thinking bad over boost bulb maybe. Kind of a pain to start there though. Does it dim when you add an excessory (wiper , heater , center difflock ,4way flashers etc ) or apply the brake lights , or even if you manually shift through the gears reverse too . There are a lot of grounds to check many of which are internal . I drowned a truck once and pulled every plug apart chasing many ground problems . If it only does it with the turn signals I'd pull that flasher unit first , then check a couple obvious grounds that are easily excess able. Then swap around your flasher units then pull your turn signal bulbs one at a time. Chasing electrical can be a royal pain and costly a simple test bulb tester between your battery and your positive watching the bulb draw glow down as you disconnect your culperts. Hope this helps.
Click to expand...
Thanks wrongway, I have done a cursory review of wiring and connections, everything "appears" to be in order. I think that the light started around the same time as the "Timing Belt" light, and I was thinking the same thing. I have had need to chase electrical gremlins in the past, no, not fun never seam to get it right. Bella does not appear to have that issue going on with anything else electrical, and the work done appears to be good work regarding electrical mods. I will start with the timing belt light reset and see where that takes this. If that's not it spend a day chasing down possibilities, does not sound fun. As per IanB I checked the wiring for the sensors and it looks ok, but did not take volt meter to it yet, could it be a bad sending unit for overboost?
 
uploadfromtaptalk1444876029074.webp

It's confirmed. The orange light coming on was the result of the timing belt warning light. I suspect blead between the lights?
I pulled the rubber grommet and reset the light with a paperclip, and bam no overboost light. Thanks for everyone chiming in and I hope it helps others.
 
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