BAC Forum

General Boards => Technical Support => Topic started by: Jim Edwards on June 24, 2015, 09:59:24 PM

Title: Chassis power cut out
Post by: Jim Edwards on June 24, 2015, 09:59:24 PM

Just driving down the road and chaise power cut out, dash dead trans control dead no engine power Rolled a little further maybe 3-4 seconds all came back to life. Allison transmission in neutral. Shifted to D and motored along.  Happened again down the road apiece but was able to get home. Otherwise runs fine. Any  Ideas on how, what  or where to start?

Thanks Jim

2005 40 ft Monterey, Cat c9   

Title: Re: Chassis power cut out
Post by: Dave Atherton on June 24, 2015, 10:49:59 PM

Hi, there has been a Bullentin with key switch and intermittent power loss to the ECM. If you have
A silver leaf should give you a code. Basic what is happening ( depending what you have connected
to your key ring .) Thinking if there is a lot weight hanging on the key problem could start at key
switch .  Can you give me your email address, I can send you the information related the problem
With your C-9 engine.  Dave Atherton retired Cat mechanic.

Title: Re: Chassis power cut out
Post by: John Hennessey on June 24, 2015, 11:45:25 PM

We had the same thing happen several times.  My husband replace the starter and solenoid and it has never happened again.

Title: Re: Chassis power cut out
Post by: Edward Buker on June 25, 2015, 05:47:57 AM

Jim,

It is possible, if you have a solenoid at the bottom of two copper busses in the electrical bay, that the solenoid is intermittently loosing contact. Basically it would be like turning off the ignition when this solenoid does not make and maintain good contact. They are prone to fail. When you turn the key on it powers this solenoid to close contacts.

Later Ed

Title: Re: Chassis power cut out
Post by: Dave Atherton on June 25, 2015, 02:59:05 PM

Jim Edwards, will send you info later today on your shut down problem. As I indicated there is a
Bullentin on C-9 key switch, going deeper into the information coming off the ECM. Cable connection
J-1 which is the cable connection to the right looking at the ECM from the side view. Connections
to the J-1 harness batterie connections plus & minus,, key switch, batteries plus 9 ground switch inputs. Looking around the electrical and batteries and key switch. Will lookup the color of the wires
coming off the J-1 pig tail harness which should help you trace problem later today. This is the
OEM Harness that has other wires going different directions also.
Dave Atherton Retired Cat Mechanic

Title: Re: Chassis power cut out
Post by: John Hennessey on June 25, 2015, 03:12:02 PM

Yes Ed, that is exactly what happened to us. The Solenoid failed.

Title: Re: Chassis power cut out
Post by: Gerald Farris on June 25, 2015, 04:12:37 PM

Jim,
There is probably a 95% chance that you need to replace the ignition solenoid in the LF electrical bay that Ed referred to. It has such a high failure rate that I carry an extra on with me in the coach. Only use a replacement that is rated for least 85 amp continuous duty service.

Gerald

Title: Re: Chassis power cut out
Post by: John Hennessey on June 25, 2015, 10:17:23 PM

Sorry my husband informed me that it was the ignition switch and solenoid.