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fishfinder powers off when starting engin

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Member - Posts: 1
Member spacespace
Joined: September 05, 2014
Location: Texas, United States
Posted: September 05, 2014 at 2:24 PM / IP Logged  
I have a new boat, about 1 month old. I purchased a fish finder and had it installed. Works good but when I crank the engine the fish finder powers off. Is there a way to have some type of capacitor and diode combo to keep 12 volts to the device for a few seconds to keep it from powering off when I start the engine? I am not an electronics expert by no means so please post any reply in basic details. Any help would be appreciated. Thanks in advance.
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: September 05, 2014 at 3:36 PM / IP Logged  
Push starting the boat would solve the problem, but I understand wanting to stay dry or not having big nor flat enough feet.
A cap and diode might work if the diode voltage drop is low enough and cap big enough. That's a combination of the unit's spec (lowest operating voltage) & current, and the voltage dip involved.
It could also be a weak or small battery or if the finder shares the same current path from the battery as the starter motor.
Options include a dc-dc converter or dual-battery system - tho being marine I'd assume a voltage sensing type battery isolator would be required (bad luck; more expensive and not as good as charge-light etc controlled relays).

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