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Author Topic: Unit powers off when motor runs.  (Read 3599 times)

Offline waterfish9090

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Unit powers off when motor runs.
« on: March 17, 2015, 03:34:16 PM »
I have a helix down imaging unit on my trolling motor it works great however when I run the outboard motor it shuts off and I have to The power cable from the helix and plug it back up and then it works fine until I run the big motor again.  Does anyone have any idea how I can remedy this?

Offline Jrsmith_80

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Re: Unit powers off when motor runs.
« Reply #1 on: March 17, 2015, 03:48:34 PM »
Does it shut off only when you start the big motor??  If so, Im gonna guess that the power loss from starting the big motor drops the voltage to low and kills the unit.  Mine used to do that until I switched it over to the trolling motor batteries.  Just a thought @waterfish9090
« Last Edit: March 17, 2015, 03:53:48 PM by Jrsmith_80 »
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Offline waterfish9090

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Re: Unit powers off when motor runs.
« Reply #2 on: March 17, 2015, 04:16:27 PM »
It doesn't shut off when I crank the motor but as the motor idles some then it shuts off

Offline waterfish9090

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Re: Unit powers off when motor runs.
« Reply #3 on: March 17, 2015, 04:16:55 PM »
Thank you for the input.

Offline Curt

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Re: Unit powers off when motor runs.
« Reply #4 on: March 17, 2015, 04:56:05 PM »
Loose wire somewhere? Maybe the vibration from the outboard running is triggering it.

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Offline clvalent

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Re: Unit powers off when motor runs.
« Reply #5 on: March 17, 2015, 05:36:14 PM »
I was told this can happen if your cranking battery doesnt have enough amps.  It can cause the unit to power off when you start the big motor.  I guess this is only true if your unit is wired to your cranking battery.  Just a guess
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Offline Eric Low

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Re: Unit powers off when motor runs.
« Reply #6 on: March 17, 2015, 06:17:59 PM »
Diehard Platinum group 31 will fix that. One of these days after a lot of fishing and not much running your outboard isn't going to start.

Offline GotMyAlly

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Re: Unit powers off when motor runs.
« Reply #7 on: March 19, 2015, 11:46:32 AM »
Is it powered off of your cranking batt (voltage draw causing it to cut out)?

Or is it powered off of your trolling motor batteries (loose wire causing a break in the circuit from the vibration)?

I'm betting it's the former.  I'd look at a weak batt first.  If not that, i'd check out the alternator with an electrical tester.

With all of the electronics on todays outboards, just about all of the alternators output at idle is consumed to by the outboard itself.  There isn't much output above that to charge the cranking batt until the RPMs come up.  Factor in the voltage draw from hydraulics (trim and jackplate) and you can sap the charge out of a batt pretty quick even with the engine idling.  That's why most of the new motors require 1000 MCA minimum.

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