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Raymarind A65 Turns Off When Starting Motor

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Raymarind A65 Turns Off When Starting Motor

Old 04-23-2007, 12:45 PM
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Default Raymarind A65 Turns Off When Starting Motor

Hi All:

On my BX22T I have installed a Raymarine A65 Depth finder/Chart plotter. The A65 is wired through the main buss (inside the center console) through a 4 amp fuse. The problem I am having is every time I turn the starter the A65 turns off. What I believe is happening is the DC Voltage drop when starting is so significant it activates the A65’s protective circuitry (anything less than 12VDC turns off the A65).


My questions is, could this condition be a result of the cheap battery that was installed in the boat by the Dealer, or is there something else in the boats circuitry that would cause the buss voltage to drop below 12 VDC when cranking the motor? I have looked at the schematic and am unable to find anything that would cause this to happens, but I have seen wiring in new products that do not reflect the MFG's drawings.


Thanks


Rich
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Old 04-23-2007, 01:34 PM
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Default Re: Raymarind A65 Turns Off When Starting Motor

this is a common problem, the only real fix is to have a separate house battery for your electronics. or turn off the unit when starting the engines.
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Old 04-23-2007, 02:28 PM
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Default Re: Raymarine A65 Turns Off When Starting Motor

Duct Tape:

Thanks for the information. I was afraid of that. Oh well, guess I should be glad Sea Hunt provided ample pull stings through the hull for running wire.

Rich
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Old 04-02-2008, 04:40 PM
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Default Re: Raymarind A65 Turns Off When Starting Motor

Update -

The problem turned out to be a cheap battery the dealer installed in the boat. A new Trojan Battery resolved the issue.
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Old 04-02-2008, 07:42 PM
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Default Re: Raymarind A65 Turns Off When Starting Motor

Although the larger battery/newer battery may have appeared to "resolved" the problem, it really has only kept the unit from turning off. There is some risk of damage to electronics when you start the engine because of both low voltage and voltage spikes as the alternator comes on line. Long ago I lost some electronics and ever since I have put the electronics on a separate battery. Currently I use a VSR to allow charging when the engine is running and the starting battery is over 13.7 volts. As noted another way to avoid this is with a switch--and turn off the unit when starting.
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Old 04-02-2008, 09:51 PM
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Default RE: Raymarind A65 Turns Off When Starting Motor

Had the same problem. Simple and reasonably priced fix is to install a New Mar Startguard which is basically a small dedicated battery that will ensure adequate minimum voltage to your electronics when you start your engines and place a significant draw on your batteries. Cost is around $150 and the battery has a 5 year warranty. Have had mine for over 2 years and it has worked absolutely perfectly no matter how many times I restart the engines while fishing. Hope this suggestion is helpful.
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Old 04-02-2008, 10:17 PM
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Default Re: Raymarind A65 Turns Off When Starting Motor

I had poorer results with the NavStartguard. The addition of a 3rd ,islolated, battery dedicated to electronics years ago solved the voltage-drop problem that had fried a couple electronics boards previously.
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Old 04-03-2008, 12:02 PM
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Default RE: Raymarind A65 Turns Off When Starting Motor

If you don't have a dual battery setup, you should.
I have the StartGuard as well, the diesels take a lot to crank and it solved the problem.
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Old 04-03-2008, 01:08 PM
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Default Re: Raymarind A65 Turns Off When Starting Motor

Thanks for the replies I have received on this topic!

After review of the manual, and a conversation I had with Raymarine Technical support; I have learned that in the case of the A-65 it is perfectly acceptable to connect this unit to the start battery. The A-65 has ample protective circuitry to combat a Low Voltage, or High Voltage fault scenario.
From what I have been able to gather, the circuitry in question samples incoming voltage at a high refresh rate, if power anomaly exists the A-65 will quickly engage the protective circuitry.

Today I decided to test this theory, and hooked my A-65 to a Hewlett Packard laboratory grade (0 – 30Vdc @ 0 – 10 A adjustable) bench supply.

• For the test I started with 13.8Vdc, and powered on the A65. Once the A65 reached a steady state I then began to steadily increase the voltage upward.
o At 15.1Vdc the unit shut itself off.
o I then set the bench supply to 13.8Vdc and press power, the unit comes back to life.
o I repeated the steps above three times, and came up with almost the same result every time (other than the voltage trip point was off by 100 – 200mV).

• I then turned off the A-65 and Increased the voltage to 28Vdc and tried to power on the unit

o A-65 would not power up after three attempts.
o I dropped the voltage back down to 13.8Vdc the unit powered back on and began to operate normally.

I did not have enough time before it began to rain here for a low voltage test, but plan on trying it tomorrow.

I would love to put an extra battery in, but I currently have three batteries installed in my boat. Two run my trolling motor, and other is for starting the engine. I have looked for a practical place to install an additional battery without success.


Rich
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