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Old 09-27-2020, 09:06 PM   #29
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I discovered the exact opposite last week. It's when I turn the marker lights on, the primary & secondary air gauges start flopping to zero and the low air alarm sounds. Turn the lights off, the gauges are OK. I phoned Freightliner last Monday but was only able to leave a message.
Let us know what Freightliner has to say. Very interesting.
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Old 09-27-2020, 09:12 PM   #30
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I discovered the exact opposite last week. It's when I turn the marker lights on, the primary & secondary air gauges start flopping to zero and the low air alarm sounds. Turn the lights off, the gauges are OK. I phoned Freightliner last Monday but was only able to leave a message.
The cables connecting your gauges, are they the upgraded black cables? Have you had any issues with your chassis batteries or low voltage to the dash?
Let us know what Freightliner has to say.
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Old 09-28-2020, 08:57 AM   #31
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Cables are original. I've been searching for the TSB without success. My local Freightliner shop has been no help. Even after I told them about the TSB and gave them the part numbers for the new cables! All they want to do is run diagnostics = $$$$. Left another message at the main customer service in Gafney. I'll also send an email now.
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Old 09-28-2020, 09:21 AM   #32
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Originally Posted by 95f5334j View Post
Cables are original. I've been searching for the TSB without success. My local Freightliner shop has been no help. Even after I told them about the TSB and gave them the part numbers for the new cables! All they want to do is run diagnostics = $$$$. Left another message at the main customer service in Gafney. I'll also send an email now.
I don't recall ever reading about a TSB or SS for the gauges problem. The LBCU diagnostics is good....the cables sometimes fixes the issue. Sometimes a faulty gauge is the issue. (I still have intermittent operation and haven't been able to nail down a faulty gauge, although I believe that's my problem).
I even purchased a used LBCU for a repair...and that wasn't it. Was able to help out a 2 members though with it.
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Old 09-28-2020, 10:05 AM   #33
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I don't recall ever reading about a TSB or SS for the gauges problem. The LBCU diagnostics is good....the cables sometimes fixes the issue. Sometimes a faulty gauge is the issue. (I still have intermittent operation and haven't been able to nail down a faulty gauge, although I believe that's my problem).
I even purchased a used LBCU for a repair...and that wasn't it. Was able to help out a 2 members though with it.
While driving down the road one day one of my air pressure gauges suddenly dropped to zero setting off the alarm! Man, did that get the adrenalin flowing!!
While trying to determine what action to take I noticed the gauge "twitching", it then immediately jumped back up to normal pressure and the alarm silenced. I was thinking that the actual pressure could not realistically drop that fast and then recover. I figured that I had a dash instrument issue.
After googling the issue I found a post about the cable upgrade.
Calling Freightliner and explaining my issue the tech on the other end immediately knew what I was talking about. He gave me the part numbers I needed. Calling the local Freightliner shop I ordered the parts and picked them up about a week later.
I don't have the part numbers with me but Freightliner should set you up.
My dash was easy to remove, 6 screws and I was able to lift it way from the panel. COMPLETELY deplete any remaining air pressure by applying the brakes multiple times. Both primary and secondary air pressure gauges have air lines running to them. These two gauges are the only gauges that transmit data to the LBCU. Athens other gauges only receive data from the LBCU. Note the colors of the air lines before removing. You depress a brass collar on the air line fitting applying slight inward pressure. They should then pull right out. If you forget to relieve air pressure you will immediately know! LOL Although the lines are tougher to remove if under pressure.
My instrument panel was connected by the two air lines and two connectors on the backside of the LBCU.
Swapping the cables was easy. Just swap one cable at a time. The cable with the choke connects to the LBCU. Each gauge has a unique ID, they don't have a specific connection pattern to the cables.

You need to contact Freightliner Custom Chassis!!!! NOT your local Freightliner parts desk.

Hope this helps.

Also, that LBCU, If you purchase a USED functional LBCU you will get generator hours and odometer numbers from the previous coach the LBCU was installed in. New, the LBCU "burns in" the odometer reading when first installed. To get the actual mileage you have to drill down to the odometer diagnostics. In the ODO diagnostics you will see three numbers, IP ODO, ENG OPO and DIFF.
IP ODO is the instrument odometer reading, this is the prior coach odometer reading. ENG ODO is the mileage from the engine miles and DIFF is the difference between the two numbers. This information was passed on to me by the Freightliner tech. If you need actual odometer number you need to open the odometer diagnostics. If you want the actual number up fron you need to purchase a NEW LBCU, around 600 dollars last check.

If anybody has additional information please respond!
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Old 09-28-2020, 10:09 AM   #34
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mchero....why talk about removing the air lines from the pressure gauges? I don't see the need to do that, of course unless those are gauges you're replacing?
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Old 09-28-2020, 07:40 PM   #35
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Finally able to speak with someone at Freightliner Gaffney customer service center which turned out to be less than useful. The guy didn't have a clue after I explained the issue in detail. He could not find any info on a TSB or much else for that matter. In the end, all he could do is confirm a new wire harness was created (confirmed by my VIN) but he didn't know why.

The new part numbers for the BLACK wire harness kit are as follows:

A06-69135-012 qty 1 $25
A06-69136-012 qty 6 $25 each
POL 028A274098004 qty 2
$10 for the pair

It will take about 10 business days to get the new wires, they are coming from 2 different locations. Installation instructions are to be included with new wires.
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Old 09-28-2020, 09:06 PM   #36
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mchero....why talk about removing the air lines from the pressure gauges? I don't see the need to do that, of course unless those are gauges you're replacing?
Makes it MUCH easier to replace those cables. Very easy to work on it when it's sitting on your workbench. Only takes about 30 seconds to remove those lines. My panel would only pull out a couple inches. If the OP can easily get to the backside w/o pulling the panel then he does not need to pull the air lines.
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Old 09-29-2020, 07:24 AM   #37
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Makes it MUCH easier to replace those cables. Very easy to work on it when it's sitting on your workbench. Only takes about 30 seconds to remove those lines. My panel would only pull out a couple inches. If the OP can easily get to the backside w/o pulling the panel then he does not need to pull the air lines.
I see. Your chassis build must be way different than mine. I removed screws from the back panel (front of coach) and work on the gauges. I guess if one had to remove the dash panel from the front...it would be a big pain.
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Old 09-29-2020, 07:27 AM   #38
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Finally able to speak with someone at Freightliner Gaffney customer service center which turned out to be less than useful. The guy didn't have a clue after I explained the issue in detail. He could not find any info on a TSB or much else for that matter. In the end, all he could do is confirm a new wire harness was created (confirmed by my VIN) but he didn't know why.
That's because, as I wrote, there isn't any TSB on this issue.
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