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61
Technical Support / Re: C13 KCB WATER TEMP OR OIL SENSOR?
« Last post by Dennis Hackert on October 03, 2025, 05:15:28 AM »
Eric,
I understand all that you just said.
The part where you mention a rear service panel, if i have one its hidden pretty good cause I dont see it.
I have a guage in dash and a monitor screen which the Alladin is connected to, both at the driver seat.
I am not sure but I think that sender is for dash guage. (shes not running at the moment I am putting a recored radiator and new air coooler in)
Quite a project!
The dash guage wasnt working before, but the monitor was.
I will let you know if its working when I get her back up running.
Eric thank you very much for your time spent here.
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Technical Support / Re: C13 KCB WATER TEMP OR OIL SENSOR?
« Last post by Eric Maclean Co-Admin on October 02, 2025, 03:22:01 AM »
Dennis
The Aladin system receives it's information from the engines ECM via a serial stream data buss.
The ECM will have a separate oil pressure sensor on a C13 it should be located just behind the oil filter and should have three wires running to a plug ,plugged into the engine wiring harness.

The dash oil pressure gauge is an analog gauge which receives it's information from an analog sending unit like the one you showed.
A single wire sending unit will be a variable grounding unit meaning that grounding the signal wire should peg the gauge to the gauge full range.
More ground more gauge reading no ground no reading.

If that makes any sense.

If your coach has two oil pressure gauges ( one in the dash and one in the rear service panel then it should also have two of those oil pressure sending units.

Hope this helps
Eric
63
Technical Support / Re: C13 KCB WATER TEMP OR OIL SENSOR?
« Last post by Dennis Hackert on October 02, 2025, 02:32:41 AM »
Thank you Eric,
that makes total sense,Is the service panel the same as the Aladin system?
I will order that. I have the radiator and air cooler and fan out right now, good time to get it replaced, if I remember correctly OP showed up on service screen but not dash gauge.
I hoped to meet you and ask how you know these things.
again thank you!!
Dennis
64
General Discussion / Re: Big Boy Isolator / Relay
« Last post by Joel Ashley on October 02, 2025, 01:23:19 AM »
Like Scott, I also am not sure how the BB would cut off chassis power.  You say it “kicks in” after a few minutes of shore power disconnect.  Perhaps you are hearing some other device, like the transfer switch, though that’s normally within seconds, not minutes.  Is the battery boost switch on your dash (armrest panel?) off?  Perhaps the BB or BIRD are miswired? 

Loss of chassis power to anything would send me first to the streetside forwardmost electrical bay, wherein I’d check the power busses;  and then the solenoid’s posts with a voltmeter, initially with the ignition key off and then check again with it on.  Given its reputation, the one thing I’d suspect is the ignition solenoid there.  Some owners have replaced it with the wrong one, or remounted it’s diode backwards.

But you say you do have power to all chassis components while on shore power?

Joel
65
Technical Support / Re: C13 KCB WATER TEMP OR OIL SENSOR?
« Last post by Eric Maclean Co-Admin on October 01, 2025, 08:46:31 PM »
Dennis
That appears to be a single wire analog oil pressure sending unit for an apology oil pressure gauge likely installed by the coach builder not the engine manufacturer.
These coaches often had two of those one for the dash gauge and the other for a gauge in the service panel.


https://www.amazon.ca/CADUFUELLY-0570-1857-Pressure-Replacement-Replaces/dp/B0DQ3MS832/ref=lp_9164319011_1_12_sspa?keywords=Oil+Pressure&pf_rd_p=bdb9c561-5fbc-41bd-9c6c-a048ad366969&pf_rd_r=0V4TRQNE2V9YA3MAE6C1&sp_csd=d2lkZ2V0TmFtZT1zcF9hcGJfZGVza3RvcF9icm93c2VfaW5saW5lX2J0Zg&psc=1

Hope this helps
Eric
66
Technical Support / Re: Drive Shaft U Joint bolt torque spec
« Last post by Zeb Severson on October 01, 2025, 07:38:37 PM »
Good time to relube if you haven't already. My first time lubing the u joints I had to loosen a few of the bolts to get the grease to move through.
67
Technical Support / C13 KCB WATER TEMP OR OIL SENSOR?
« Last post by Dennis Hackert on October 01, 2025, 06:16:50 AM »
I came across this sender/sensor on side of engine block (driver side of engine) not sure if its for water or oil?
Picture attached....Guess my picture is to big , it wont send
I did call Thomson CAT, they couldn't help for reason I don't know, something added for coach side? aqua hot eng. heater??
its right behind exhaust pipe coming down, midway up from bottom of block, not in head.
thank you in advance for your time here,


Dennis
Mr.Huber resized photo to fit on here,(said it tells you how under members only column.)
68
General Discussion / Re: Big Boy Isolator / Relay
« Last post by Scott Shearer on September 30, 2025, 09:24:00 PM »
Shane,

Unless an issue exists, the Big Boy relay should never isolate the chassis battery bank from the chassis circuit system.

Check your chassis battery disconnect switch to see if it is passing current.

The purpose of the Big Boy relay is to join the chassis and house battery banks when the BIRD relay (or PCB) ‘thinks’ that charging is taking place. This allows both battery banks to be charged from a single source (invertor/charger, alternator, solar). The Big Boy should drop out and disconnect the chassis and house battery banks from each other when the voltage goes below the threshold, indicating that charging has ceased.

-Scott
69
General Discussion / Re: Big Boy Isolator / Relay
« Last post by Steve Huber on September 30, 2025, 09:06:52 PM »
Shane,
Access "Coach Assist" on the BAC website. It's under the "Technical" tab. You will find complete writeups on the "BIRD" and "Big Boy" units in the "Electrical Systems" section. The lock system is powered by the chassis batteries. You will also find the wiring diagrams for your 07 in Coach Assist. It sounds like your battery voltages may be low.
Steve
70
General Discussion / Big Boy Isolator / Relay
« Last post by Shane Froman on September 30, 2025, 07:19:39 PM »
Hello everyone - New to this group and have a new to me 07 Contessa.

A recent issue has started when I disconnect from shore power, the Big Boy Isolator kicks in within minutes isolating and killing power from the chassis. At this point I have no power to my alarm system or keyless entry, among other things. I find this odd as I would think these things should still function as long as the battery has some juice. All batteries are new and I tested both, house and chassis to ensure there was plenty of amperage.

So questions are -

Is it correct that keyless entry would not work any longer if the big boy isolated the chassis battery? Do I have another problem?

What tells the Big Boy when to cut the power and at what battery level? (is it the relay module?)

Pics attached

Thanks in advance for the help!
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