gmacd81
Active Member
- Sep 2, 2014
- 190
- Boat Info
- 2002 460DA hardtop, Raymarine eS128 & eS75, Evolution AP, SHD color radar, Ray260
Walker Bay w 40hp
- Engines
- Cummins 6CTA M3's, Onan 11.5 kW genset
500/520 DB official thread
- Thread starter Havana Shamrock
- Start date
j98052
Active Member
I think I have a short in my central vac - it randomly comes on for 1-2 seconds and then shuts off. Anyone else experience this?
Without the hose inserted? Never.
j98052
Active Member
Correct. I'm guessing there is a short somewhere...
Jeremygavin
Well-Known Member
- Mar 6, 2012
- 2,054
- Boat Info
- 2011 520 Sedan Bridge
2016 Sea Ray 19 SPX OB
2019 Walker Bay Generation 340
- Engines
- Cummins QSM11s
Mercury 150 Fourstroke
Honda 40hp
Maybe in one of the outlet rings that you plug the hose into. I have never had one apart but I assume there are 2 contacts in there that the metal ring on the hose connects.
j98052
Active Member
That makes sense and is a good starting point. It could also be a short somewhere in the wiring from the outlets to the vacuum.
Pull one of the low voltage wires off the terminal on the vacuum unit and see if the issue continues; this will isolate if the issue is in the vacuum unit or the wiring to the hose connections.
- May 16, 2019
- 1,035
- Boat Info
- 07 52 Sedan Bridge, 2019 Brig Falcon 360HT-30HP Honda, 2003 16' Dauntless
- Engines
- Cummins QSM 11 660 HP w/ ZF 325-1A
Followed your lead for many of your same reasons. Wanted to tie into the Nema 2000 but that requires a Maretron Device to decode the Onan Gen info and I do not think you can get the engine hours from that connection.
One thing I did differently; rather than running two sets of cables I spliced into the wiring harness inside the Generator Control Box.
Also while doing this I found Lighting (relays) behind the wall/electric panel.
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cod
Active Member
Hey Tom, Since the original controllers are 15 amp. maximum, did you go with the 12 amp. or 25 amp.with the Blue Sea? I’m assuming the 25?
Those aren't dimming controls; they are latching relays for the lighting that have the push-button momentary switches (I had to replace both of mine) . Also, FYI, if you look at the back of the electrical panel (to the left in the photo), you will notice a blade fuse block; that is for the CO detectors, Glomex OTA amplifier, and that panel's lighting.
12A - I did change all of the bridge lighting to LED so there was really no need for the larger one.
cod
Active Member
Did you replace the latching relays with a Blue Sea product as well and if so do you know which model. I need to change the one for the cockpit. I thought those were same as the bridge.
The two dimmer modules under the helm were replaced with the Blue Sea Systems Deckhand Dimmers.
The two latching relays behind the circuit breaker panel were replaced with InPower VCM01 latching relays; I got those from Del City.
https://www.delcity.net/store/InPow...erm=4576923312717602&utm_content=All Products
- May 16, 2019
- 1,035
- Boat Info
- 07 52 Sedan Bridge, 2019 Brig Falcon 360HT-30HP Honda, 2003 16' Dauntless
- Engines
- Cummins QSM 11 660 HP w/ ZF 325-1A
QSM11 52DB Best Cruise MPG:
Curious what everyone’s best are... my best MPG/GPH seem to change by tide and winds but the below is about the best I have seen.
Interestingly right after my prop trimming (last fall) to 28 x 30.5” (from 28” x 32”) my GPH was 19.5 at 2000 RPM’s. So my GPH has increased at 2000 RPM from last fall.
60% +/- Trim Tabs, 3/4 Fuel, 1/2 Water, 87 Degrees Air/Water:
RPM - 1950
KTS - 23.0
GPH - 20.2
MPG - .65
Curious what everyone’s best are... my best MPG/GPH seem to change by tide and winds but the below is about the best I have seen.
Interestingly right after my prop trimming (last fall) to 28 x 30.5” (from 28” x 32”) my GPH was 19.5 at 2000 RPM’s. So my GPH has increased at 2000 RPM from last fall.
60% +/- Trim Tabs, 3/4 Fuel, 1/2 Water, 87 Degrees Air/Water:
RPM - 1950
KTS - 23.0
GPH - 20.2
MPG - .65
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Seems my boat likes to run with a bit less RPM (December 2019 data)
RPM - 1800
KTS - 22.0
GPH - 34.5 (both engines)
Load - 63%
Tabs - down 20%
Fuel - 90%
Water - 100%
Bottom and running gear - clean (fresh hard anti-foul coating)
Water Temp - 77 Deg F
cod
Active Member
Tom.......Prop Pitch?
Last edited:
- May 16, 2019
- 1,035
- Boat Info
- 07 52 Sedan Bridge, 2019 Brig Falcon 360HT-30HP Honda, 2003 16' Dauntless
- Engines
- Cummins QSM 11 660 HP w/ ZF 325-1A
I have not checked the GPH, etc while below 1950 or so... I was under the impression that I would be creating too much heat at that RPM and not pushing enough air through. You are running 1500 less RPM and about one knot less.
Do you cruise at that speed often? I also run 50-70% Trim Tabs most of the time.
Yes, 1800 to 1850; seems like the boat likes it.
The tab setting may be more or less but that is what is indicated at the best speed.
- May 16, 2019
- 1,035
- Boat Info
- 07 52 Sedan Bridge, 2019 Brig Falcon 360HT-30HP Honda, 2003 16' Dauntless
- Engines
- Cummins QSM 11 660 HP w/ ZF 325-1A
Wonder what the MPG are at your 1800RPM's?
