BAC Forum

General Boards => Technical Support => Topic started by: Randall Gibbons on October 13, 2021, 04:46:38 PM

Title: EMC CAT 3126B Wiring
Post by: Randall Gibbons on October 13, 2021, 04:46:38 PM

Does anyone have a wiring diagram for a 1998 Beaver CAT 3126B ECM?

Title: Re: EMC CAT 3126B Wiring
Post by: Mike Shumack on October 13, 2021, 04:53:54 PM

Not exactly a wiring diagram - but I have this service manual/info on the 3126B that may be useful.

Title: Re: EMC CAT 3126B Wiring
Post by: Randall Gibbons on October 13, 2021, 06:28:29 PM

Thank you so much. I need the wiring diagram for the ECM. I think i have a bad wire coming out of the 70 pin connection.

Title: Re: EMC CAT 3126B Wiring
Post by: Mike Shumack on October 13, 2021, 08:29:45 PM

I have ECM/wiring schematics for the C7 - not sure if that is of any help.

Title: Re: EMC CAT 3126B Wiring
Post by: Eric Maclean on October 13, 2021, 11:19:53 PM

Randall
Page #18 of the 1996 patriot working diagram in coach assist should show you the coach wiring to the ECM and pin numbers ( I know it's not for a 1998 but it should be the same)
 Remember to check the rear start switch first as it has given many of us  problems ( corrosion bad connection etc).

Hope this helps
Eric

Title: Re: EMC CAT 3126B Wiring
Post by: Larry Fritz on October 14, 2021, 03:34:06 AM

Randall Gibbons.................It is possible I can get you some info and help out. I have a coach just like yours (mine is a 98 37' ticondoraga) and I do have all of the wiring harness drawings that existed in those days for that Beaver. Call me anytime but I live in CST now. My drawings were for for mostly the manufacturing of the wiring harnesses and not true schematics but with patience you can usually figure things out. I hope I can answer some of your questions.  BAC Member since 2000!

Larry Fritz
(408) 515-5957

Title: Re: EMC CAT 3126B Wiring
Post by: Randall Gibbons on October 14, 2021, 04:49:19 PM

The c7 diagram will work if you could send it to me.

Title: Re: EMC CAT 3126B Wiring
Post by: Mike Shumack on October 14, 2021, 05:13:21 PM

Turns out there is a specific ECM wiring diagram available for the 3126B at the site where I got the other schematics (the C7 and C13).

https://www.thetruckersreport.com/truckingindustryforum/threads/cat-wiring-diagrams.1349361/

You have to register (free) to be able to download - or just give me your e-mail address and I'll send them to you. The files are too big to upload to this forum.

The 3126B and 3126E diagrams are under the file name "7AS,8YL,CKM 3126" on the site above.

Title: Re: EMC CAT 3126B Wiring
Post by: Randall Gibbons on October 14, 2021, 07:00:00 PM

Rancosandblastin@bellsouth.net

Title: Re: EMC CAT 3126B Wiring
Post by: Mike Shumack on October 14, 2021, 10:52:05 PM

Sent