Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 20-11-2019, 15:43   #1
Registered User

Join Date: Mar 2015
Posts: 3
Radar requires engine to be on

Hi, this my first post though I've been reading the forum for a long time.

I recently upsized from a Contessa 26 to a Bayfield 29 which came with all kinds of great things...like headroom. It also has radar but for some reason the radar won't run unless the engine is on. By "won't run" I mean the screen flashes which indicates a power issue. I have some theories: batteries are not producing (they are a couple of years old); power cabling is inadequate; I'm getting power loss at a connector somewhere.

I asked the PO about the issue and he said that his wife said that radar always required both batteries which was news to him.

Anything you'd add to my list to check?
__________________

and4ew is offline   Reply With Quote
Old 20-11-2019, 15:51   #2
Certifiable Refitter/Senior Wannbe
 
Wotname's Avatar

Cruisers Forum Supporter

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 9,879
Re: Radar requires engine to be on

Belated welcome to CF and4ew.

You have described a typical low voltage issue, the only question is where the voltage is being lost.

It could be at the source (batteries) or anywhere along the circuit to the radar connector.

Simply get out the voltmeter and track it down. You can start at either end - batteries or radar or even in the middle, say the radar circuit breaker / fuse.

Does anything else on board show low volts symptoms, if not then I would suspect some corrosion somewhere in the radar circuit.
__________________

__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is offline   Reply With Quote
Old 20-11-2019, 16:33   #3
Registered User
 
Reefmagnet's Avatar

Join Date: May 2008
Location: puɐןsuǝǝnb 'ʎɐʞɔɐɯ
Boat: Nantucket Island 33
Posts: 3,689
Re: Radar requires engine to be on

+1. Just to add, it is common with some radar installations to have to cut and rejoin the scanner cable "somewhere" along it's length in order to feed it through all the nooks and crannies. Very good candidate for problems at this connection if done a bit dodgy, especially if it has "always" needed the engine on to operate. It's also not beyond the realm of possibilities that some electrical genius wired it up to only run with the engine on and parasitic currents are allowing it to operate partially with the engine off.
Reefmagnet is online now   Reply With Quote
Old 20-11-2019, 16:55   #4
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 8,406
Re: Radar requires engine to be on

Check the voltage at the batteries with the radar both on and off. If there is any difference then I would suspect the batteries can't handle the load. You haven't told us what type of batteries you have and how old. "Several years" could mean a lot of things.

It is not unusual for people to install "Marine Batteries" thinking that they are true "Deep Cycle", but they are not and when they get drawn down to 50% or less a few times they quickly deteriorate.
DeepFrz is offline   Reply With Quote
Old 21-11-2019, 05:42   #5
Senior Cruiser
 
GordMay's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 36,544
Images: 241
Re: Radar requires engine to be on

Greetings and welcome aboard the CF, and4ew.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 21-11-2019, 13:37   #6
Registered User
 
Cadence's Avatar

Join Date: Dec 2008
Location: SC
Boat: None,build the one shown of glass, had many from 6' to 48'.
Posts: 8,063
Re: Radar requires engine to be on

Quote:
Originally Posted by and4ew View Post
Hi, this my first post though I've been reading the forum for a long time.

I recently upsized from a Contessa 26 to a Bayfield 29 which came with all kinds of great things...like headroom. It also has radar but for some reason the radar won't run unless the engine is on. By "won't run" I mean the screen flashes which indicates a power issue. I have some theories: batteries are not producing (they are a couple of years old); power cabling is inadequate; I'm getting power loss at a connector somewhere.

I asked the PO about the issue and he said that his wife said that radar always required both batteries which was news to him.

Anything you'd add to my list to check?
Either your batteries are shot or inadequate.
Cadence is online now   Reply With Quote
Old 21-11-2019, 15:38   #7
Registered User

Join Date: Sep 2007
Location: Queensland, Australia
Boat: None at present--between vessels. Ex Piver Loadstar 12.5 metres
Posts: 1,028
Re: Radar requires engine to be on

Radars have a heavy power draw compared to other marine electronics. Especially true of older radars using CRT video displays. The other big draw is autopilots, and so most cruisers use wind-vanes when not running an engine.

I think your radar is probably OK--if you need to run it start your engine or have a gen-set handy. I always had a little Honda to run my electric fans and any electronics if the batteries dropped to 12 volts or less. Marine fans are expensive and noisy--so I used domestic electric fans through a 12 DC to 240AC sine-wave inverter. SO MUCH cheaper. Big inverters so one can use a vacuum cleaner or microwave oven are far more expensive--but still an excellent idea and worth installing--but you need the good battery bank plus back-up gen-set. I wired my AC outlets and my DC outlets and feeds in separate PVC ducts.

As for your batteries--you need to have a really good battery bank on a yacht. Three hundred ampere hours is a good starting point--which equates to a couple of tractor batteries which should set you back a couple of hundred bucks and last about two years or longer. If you go for deep cycle betteries they will last twice as long or longer, but you will need a separate starting battery and a separate windlass battery if you use one to raise your anchor--and the electronics to separate the charging and load drain for each.
Mike Banks is offline   Reply With Quote
Old 25-11-2019, 11:24   #8
Registered User

Join Date: Mar 2015
Posts: 3
Re: Radar requires engine to be on

Ok thanks. Sounds like I'm on the right track. Unfortunately won't be able to work on it until next season.
__________________

and4ew is offline   Reply With Quote
Reply

Tags
engine, radar

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Anchor Windlass requires a running engine mark0978 Electrical: Batteries, Generators & Solar 49 27-08-2019 00:41
Racor Drain Requires Bleed? Bob on OTTER Engines and Propulsion Systems 11 17-09-2012 06:22
Buy a Cat which is Complete @ $$$ or Requires Refit @ $ Zonker Multihull Sailboats 38 03-05-2011 19:31
Ordering from Canada Now Requires a Social Security Number !? SvenG Construction, Maintenance & Refit 24 24-02-2011 13:19
New Sailing Couple Requires Boat fungosport Monohull Sailboats 12 11-01-2011 03:26

Advertise Here


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 16:42.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×

ShowCase vBulletin Plugins by Drive Thru Online, Inc.