Garmin turns off when I start the engine

The capacitor by itself will not work to keep the MFD from sitting down. It will simply discharge back to the starter when the voltage drops. You can make it work by putting a diode inline prior to the capacitor

source->diode->capacitor

bobeast said:

The capacitor by itself will not work to keep the MFD from sitting down. It will simply discharge back to the starter when the voltage drops. You can make it work by putting a diode inline prior to the capacitor

source->diode->capacitor

Click to expand...

edit: I should have said it may work. The capacitor will discharge very quickly, so if it takes a while for the engine to start, it may not be able to keep up.

PROBLEM SOLVED !

In this case I'm running Raymarine Axiom radar, sonar, three screens and an autopilot.

The combined total is a good deal of amperage.

My solution was very simple - a direct run of heavy gauge duplex wire directly to the battery and ground strip.

I set up two of these: one for the electronics, and one for the 2 FUSION head units, JL amplifiers and subs. (60 amp circuit breaker)

Each of these is run off of separate battery banks and each has it's own, dedicated heavy duty circuit breaker mounted on the engine room bulkhead. (I need to add photos of the completed install)

I ran a long, LONG run of 10 gauge from the engine room all the way forward to the entertainment center for the stereo & amp, split off of that and ran a second pair to the helm for the cockpit stereo & amp.

The wire runs for the electronics at the helm and to the autopilot were shorter, the deplex wire to the autopilot motor were longer - I used 12 gauge for those runs and 10 for the autopilot motor.

The results were outstanding.

Crank the motors over and no electronic components drop out.

VHF still attached to factory wiring - it does drop out but when I re do the dash panels I'll move that to the electronics side.

A few photos (taken before completion) follow.

Will add more this weekend.

Reliable, simple and foolproof.

There is however, a significant cost to the wiring.

BEST !

RWS

in-process uncompleted photos attached - I'll get these updated this weekend.

Maybe A Dancer said:

PROBLEM SOLVED !

In this case I'm running Raymarine Axiom radar, sonar, three screens and an autopilot.

The combined total is a good deal of amperage.

My solution was very simple - a direct run of heavy gauge duplex wire directly to the battery and ground strip.

I set up two of these: one for the electronics, and one for the 2 FUSION head units, JL amplifiers and subs. (60 amp circuit breaker)

Each of these is run off of separate battery banks and each has it's own, dedicated heavy duty circuit breaker mounted on the engine room bulkhead. (I need to add photos of the completed install)

I ran a long, LONG run of 10 gauge from the engine room all the way forward to the entertainment center for the stereo & amp, split off of that and ran a second pair to the helm for the cockpit stereo & amp.

The wire runs for the electronics at the helm and to the autopilot were shorter, the deplex wire to the autopilot motor were longer - I used 12 gauge for those runs and 10 for the autopilot motor.

The results were outstanding.

Crank the motors over and no electronic components drop out.

VHF still attached to factory wiring - it does drop out but when I re do the dash panels I'll move that to the electronics side.

A few photos (taken before completion) follow.

Will add more this weekend.

Reliable, simple and foolproof.

There is however, a significant cost to the wiring.

BEST !

RWS

in-process uncompleted photos attached - I'll get these updated this weekend.

View attachment 134344

View attachment 134346

Click to expand...

Or just turn them on after the engines have started, which is what I do...

The Bill Collector said:

Or just turn them on after the engines have started, which is what I do...

Click to expand...

I’m with Bill collector! There is no cost and no work involved with turning on electronics after engines are running. I have always done that.
What is the advantage in having them on before start up? You don’t use them until the boats moving anyway.

Route planning, and to be sure all are working correctly

If you Have all of your waypoints saved already a route plan can be completed in the amount of time it takes for the engines to warm up, and the lines to be pulled, unless you leave the dock immediately without warming them up.