Autopilots destroyed by spikes?

I have had 3 Raymarine Type 300 autopilots electronics destroyed in 3 years. With the help of Raymarine I have determined thatit is possible that the electronics are being destroyed by spikes or surges on the 12 volt supply. These spikes/surges may be caused by the bow thruster and windlass being wired to the same battery bank (400ah) as the autopilot, or there may be some other cause - fridge bilge pump etc.

How can I protect the next new (and expensive) autopilot computer from destruction? The autopilot is fused at 40 amps

autopilot

by Steve
(Greece)

Good Morning,

I am interested in either a Simrad or Raymarine basic unit complete. I do no require anything too fancy or complicated. Based on my boat specs I would like your opinion on which unit would be best.

I have a 30 foot 25000 lb 32 foot semi displacement fibreglass boat. I have a 200 hp inboard with hydraulic steering (no pump). A lot of my boating is in windy conditions ( 4 to 6 Buford) & I cruise at 8 knots max 10.

Appreciate your assistance,

Steve

Autopilots destroyed by spikes?

I have had 3 Raymarine Type 300 autopilots electronics destroyed in 3 years. With the help of Raymarine I have determined thatit is possible that the electronics are being destroyed by spikes or surges on the 12 volt supply. These spikes/surges may be caused by the bow thruster and windlass being wired to the same battery bank (400ah) as the autopilot, or there may be some other cause - fridge bilge pump etc.
How can I protect the next new (and expensive) autopilot computer from destruction? The autopilot is fused at 40 amps