Furuno GaAs FET Front End 4 Tone Daylight Display - when closing the DC breaker for the rada unit, the 10 amp fuse blows. Don't have a schematic. Don't know the model number. There are no data nor nameplates on the unit. The unit name is what is on the top margin of the front panel. Any help would be appreciated.

USA left hand drive? LEFT?
not told Lef front mirror blink lamp dead too,. I bet yes.
check fuses first, all. lots there are some cars 4 fuse just for sigs
scan the PCM to see BCM errors on Turnsig blinks.
hazard fail is a huge clue here, the service manual has the schematics, all (100s of them)
1: TRAILER HITCHES? HERE, WIRED IN BY GOONS? UGLY MESS.
2: PAST COLLISION DAMAGE NOT CURED FULLY.
THIS CAR HAS BCM PROTECTION PER THIS.

The SJB utilizes a FET protective circuit strategy f

That means any short in the wiring it just self shuts down until the short is cleared. this is how all cars new are going and many have.
the SJB smart battery junction box runs all this.
F6 fuse blows all of that goes dead so is not F6 blown
a huge number of FET (means a transistor buffer amp)
the run the all per below, (the schematic makes all this better but here. 5 pages of schematics just for blinks
Fet RFrong and mirror righ
fet 2 left front and LF mirror (bingo fet 2 is overloaded shorted wire or shorted bulb LF
fet 3 RR and + hitch
fet 4 LR + hitch

the fets are basically perfect electronic fuses.
they self shut off at overload. and recover when the short is removed
so remove both lamps front left and see if the other wakes up.

my guess is mirror lamp is shorted. or mirror a wreck



the service manual is $20 to view
https://eautorepair.net/Marketing/Default.asp

the 3 amp fuse protects low voltage side of transformer. if it's blowing on a call for cooling wire pair going to outside unit bad or contactor in outside unit.

Always happy to help someone that WANTS to use the manuals, many people don't.
http://www.furunousa.com/products/productdetail.aspx?product=1715&category=Products+:+Radars+:+Radars

During printing, the main thermistor detects less than 120°C/248°F for 1
sec or more continuously.
Main cause:
The fixing film unit is faulty (main thermistor fault, thermal fuse blow, fix-
ing heater fault).
Or the power supply PCB is faulty.
Or the DC controller PCB is faulty.
Action1.
Malfunction
Turn off the power; wait for 10 min, and turn on the power. Is the problem
corrected?
YES:End.
2.Wiring
Is the wiring from the DC controller PCB to the fixing film unit normal?
NO:Correct the wiring.
3.Fixing film unit
Try replacing the fixing film unit.
Is the problem corrected?
YES:End.
4.Power supply PCB, DC controller PCB
Try replacing the power supply PCB. Is the problem corrected?
YES:End.
NO:Replace the DC controller PCB

missmatched impedance, insufficient ground, blown transistor.

you need an MB1100 matching box has the 10 pin pigtail for your sounder and accepts bare wire input from your ducer
this will also ensure that all power from sonar get to ducer, but it from me if you like 847-746-0100

visit www.gotempstar.com for the schematic on this unit. Coincidentally, your air handler unit should not draw 15.6 amps with an additional 40 for the heater.