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Old 10-28-2013, 10:51 PM   #1
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Join Date: Oct 2010
Posts: 1,459
Looking for Beaver Electrical Diagrams - CAT won't start

I've not had much luck finding diagrams either on IRV2 or at Beaver Coach Sales, but I figure there's nothing to lose in having another look just in case someone who's joined of late has something applicable.

Coach - 1999 Monterey 30’, 300 CAT

PROBLEM: coach cranks but does not start; there is no white smoke when cranking, and no diesel smell at the tailpipe, so no fuel flow. Generator runs, so I'm not out of fuel.

Recent work done since the last time the coach ran and prior to experiencing this problem:

removed one house battery (dead cell, boiled over)
replaced AC blower motor
Worked on rattles under dash and in wiring behind driver’s side kick panel (tied harnesses up with zip ties to prevent contact with steering column). This is where I think the problem is - I think I goobered something up under there.

Troubleshooting done so far (after reading every post here I could find on this subject):

DATA:
No check engine light at power on
No pre-heat light at power on
No codes are set in the Silverleaf (not stored there, but read from ECU)
All engine history and MPG data is missing in the Silverleaf (not stored there, but read from ECU)
Silverleaf shows no temps
Silverleaf shows no change in cruise control state when switched (comes from ECU)
Silverleaf shows communications with transmission (Data icon active, "no lockup" indicator on, switching from neutral to drive when engine not running triggers a warning)

POWER DISTRIBUTION:
All fuses on the “Beaver Box” (ECU and Data Logger fuses, Intake heater fuse and relay, solar fuses) are OK (pulled and checked)
In front electrical bay, power is present on the output side of the power distribution bus at power on for all ECU connections
Bosch relay in “Beaver Box” was removed and re-seated. Chatters when fuses are pulled and when re-seated, relay replaced with no effect.
Power is available to the Intake air heater relay, but does not get switched @ power on

POWER @ ECU
Chassis harness connector was disconnected from the ECU
Unswitched power is present (pins 52 and 53)
Could not verify battery negatives (pins 65 and 67) as hard grounds, appears to be a slight resistance there (~10 ohm), but no other reference as to where these wires go
Ign key switch signal does not appear at power on (pin 70)

THINGS I HAVEN’T DONE YET:
bridged Intake Air Heater relay and then tried to start (don’t think there’s any fuel present)
Looked for ECU signal at Intake Air Heater relay connector (don’t think the ECU is up)


This leads me to believe I damaged the key switch wire when working under the dash, but a visual inspection reveals nothing. I didn't bash around under there, so it's probably something subtle.

Unfortunately I don’t have a wiring diagram for this coach, and I’ve called Beaver Coach Sales before and nobody has been able to find one. I have a 1995 Patriot diagram and a few other pieces of Beaver diagrams people have sent me that gives me a general idea of how Beaver did things. However, I really need specific details on how that keyswitch signal gets to the ECU. pinouts of each connector along the way, etc.

Does anyone have ANY diagrams that might help me figure this out?
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Old 11-02-2013, 09:27 AM   #2
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Monaco Owners Club
Join Date: Aug 2013
Location: Shasta County
Posts: 55
Have you tried the Beaver Ambassador Club Forum? There are a few experts on there that really know their stuff.
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