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In case anyone needs this Trim Tab switch for a Sundancer (used in the 2000's year models), here it is: Switch: VLD1-1 VLD1-1 Carling (ON)/OFF/(ON) double pole momentary rocker switch no lamps. Sea Ray part# 757369 773879 709493 windshield vent, hatch lift, trim tabs VLD1-1, replaces VL4A...

The Mercruiser Smartcraft should have sounded an alarm. At least on my 2005 model. On 2005 Sea Rays, the Mercruiser Smartcraft reports an extensive list of engine faults and is not the same as the Sea Ray Systems Monitor which reports only a few faults, including high water and genset. The...

My Systems Monitor appears to be a hermetically sealed unit.

Related: On my 2005 390 Sundancer, the Systems Monitor was sounding a constant alarm. The display showed "all sea ray systems normal" and the reset button didn't mute the alarm. CAUSE / SOLUTION / WORKAROUND: The external alarm circuit relay inside the Systems Monitor display is broken and...

A Sea Ray Dealer may be able to order it for $700+. See: http://www.clubsearay.com/index.php?threads/systems-monitor-lcd.74842/ On my 2005 390 Sundancer, the Systems Monitor was sounding a constant alarm. The display showed "all sea ray systems normal" and the reset button didn't mute the...

CORRECTED LINK: http://www.clubsearay.com/index.php?threads/how-why-to-change-spark-plugs-in-8-1s.26439/ Check this out as well. Low profile spark plug socket used with a wrench: https://www.boatingmag.com/boating-spark-plug-diy

Check this out as well. Low profile spark plug socket used with a wrench: https://www.boatingmag.com/boating-spark-plug-diy

Glad to see the pictures are back on the original post. My pdf above is handy to save on your phone or laptop in case you ever need it while away without internet.

These spark plug wires are a direct replacement and good quality for $111. ACDelco and Inboard & Outboard printed on each with wire separators. Exactly the same as the $550 marked up Mercruiser Part 84-881698 - Spark Plug Wire Kit. They are the same part for about 1/5th the cost. 8.1L Spark...

Here is the Boattest.com performance test information for the 2005 390 Sundancer. I consider these results the best attainable with the boat (new boat, unpainted bottom, no gear, calm seas, etc.). Boattest.com Performance Results: https://drive.google.com/open?id=1iddaLIm8mebDyL-l-7eSCfzbY4TD3j3C

The 2005 39 Sundancer gas is a redesign from older years - not the same as your boat. The chart I posted was conservative too. I've since had a running gear overhaul. But cruising is still about 0.65 MPH at best. This is the way 2005-2006 era 390 / 40 sundancers perform with gas. C'est la...

Yes, the 390 Sundancer gas range and 0.55 MPG are not good. The Cruisers 48 Cantius and 54 Cantius get about 1 MPG and 0.7 MPG. However, these are diesel engines with IPS drives which increases fuel efficiency. Looking forward to my next boat. ------------ I'm including this handy info -...

We have a 2005 390 Sundancer gas with 8.1S engines. Owned it for 10+ years. Here is the performance we get - fully loaded boat. Typical Range cruising in the ocean at 3900 RPM to empty depending on sea conditions is 110 to 140 Statute Miles. Remember, range is highly dependent on sea...

Here is the tutorial with pictures - How to Change Impellers in 8.1's with Pictures http://www.clubsearay.com/index.php?threads/how-to-change-impellers-in-8-1s-with-pictures.26440/page-4 See Post 67 and 68 for the download with pictures.

My link above expired. The attachment above still works, but the pics are lower quality due to the forum upload size limit. So I've uploaded the same pdf with higher res pictures. PDF with higher quality Pictures Here: How to Change Impellers in 8.1's...

***************************** This was such a great tutorial, it's a shame to lose the pictures. So, I've upload the entire post as a pdf here with the original pictures: Download PDF: How to Change Impellers in 8.1's with Pictures.pdf http://s000.tinyupload.com/?file_id=02697398712122697579...

FYI, BPR4ES is hotter a BPR5ES. For NGK Spark Plugs lower numbers indicate a hotter type, higher numbers indicate a colder type.

IMO, 10W-30 is a bit too thin at operating temperatures for Mercruiser engines, especially the older 8.1 engines! That's why the manufacturer recommends 25W-40. In fact, Mercury recommends straight weight 40 in an emergency when that's all you can find (summer use). In Order of Preference -...

This is the exact original OEM bulb for the red and green side light fixtures as approved to provide 112.5°. 2 Mile Bulb: 912717 Attwood Purchase Here: http://www.firstchoicemarine.com/p-36377-attwood-lamp-bayonet-base-r10w-912717.aspx I got this bulb and it works well. Source: Attwood...

2 Mile Bulb: 912717 Attwood Purchase Here: http://www.firstchoicemarine.com/p-36377-attwood-lamp-bayonet-base-r10w-912717.aspx I got this bulb and it works well. Source: Attwood 2-Mile Sidelights Red/Green Pair, Deck Mount Instructions pdf on page below specifies the above bulb...