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Old 04-07-2024, 04:03 PM   #1
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Question Batteries fully charged; No electrical power at dash.

Hey all,

I have a 2010 BlueBird TX3 FE. Cummins ISB with an Allison transmission.

I had been starting it every few weeks as its currently sitting waiting for the conversion to get going.

I recently did some welding repairs to the floor and now the bus is a no-start. But like, no lights at all, anywhere.

Looking for any advice on where to start.

Ive got 13.4v at the batteries, and on the right side of the fuse panel. But no power onwards from there.

Wondering if anyone has a wiring diagram and or if someone has an info on testing if the ECM or soemthing else has gone bad? Or maybe its just a faulty ground?

All advice appreciated. Many thanks

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Old 04-08-2024, 09:09 AM   #2
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If you didn't disconnect your battery you may have fried your ECM
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Old 04-08-2024, 09:18 AM   #3
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Originally Posted by Fixicblak View Post
Hey all,

I have a 2010 BlueBird TX3 FE. Cummins ISB with an Allison transmission.

I had been starting it every few weeks as its currently sitting waiting for the conversion to get going.

I recently did some welding repairs to the floor and now the bus is a no-start. But like, no lights at all, anywhere.

Looking for any advice on where to start.

Ive got 13.4v at the batteries, and on the right side of the fuse panel. But no power onwards from there.

Wondering if anyone has a wiring diagram and or if someone has an info on testing if the ECM or soemthing else has gone bad? Or maybe its just a faulty ground?

All advice appreciated. Many thanks
If you go to the BB vantage website and plug in your vin tou might find wiring diagrams there.

Also, you need to see if there is a MASTER circuit breaker that feeds the fuse panel. You might have fried it, or others.
And a general rule, always disconnect your batterries while welding. It doesn’t matter what anyone says, this is old school 101 for welding on vehicles. Better to be safe than sorry!
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Old 04-08-2024, 10:39 PM   #4
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Originally Posted by ewo1 View Post
If you go to the BB vantage website and plug in your vin tou might find wiring diagrams there.

Also, you need to see if there is a MASTER circuit breaker that feeds the fuse panel. You might have fried it, or others.
And a general rule, always disconnect your batterries while welding. It doesn’t matter what anyone says, this is old school 101 for welding on vehicles. Better to be safe than sorry!

I was crazy when I did any welding on the chassis, I unhooked the battery, TCM, ECU, and abs controller. The manual actually specified to do that.. I have also heard of welding shops frying ecus commonly in this generation of electronics. Some of the newer Gen stuff has a bit better chip engineering. In this case though, I think it's odd that there's no power at dash. I would probably troubleshoot a bit further to see if the key on is generating voltage to certain things like the lights and wipers. I'm sure the ECU is linked to the instrument panel on the new stuff. I also have a fusebox on frame rail for the engine electronics. I would be checking all those fuses as well as the 3 other places bluebird put them.
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Old 04-13-2024, 04:01 PM   #5
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Batteries grounded to the frame need to be disconnected if welding and can cause a cascade failure to sensitive powered components.
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Old 04-18-2024, 04:29 PM   #6
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Batteries grounded to the frame need to be disconnected if welding and can cause a cascade failure to sensitive powered components.
Good thing I added a ground side battery disconnect.
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Old 04-21-2024, 05:52 AM   #7
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If you didn't disconnect your battery you may have fried your ECM
I got lucky and turns out there was a broken/corroded lug that must have broken off while pulling the battery tray in and out. Easy fix, bus is back up and running.

Stoked.
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Old 04-24-2024, 11:39 AM   #8
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Good to hear it wasn't the ECM. I already went through hell finding a replacement VPM that would work for my 3 box. I want to weld on it and am terrified now i'm going to fry one of the 3 computers.

I can disconnect the battery at the ground, but unhooking the 3 computers would not be an easy task.
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