[TG] [TG11] No pilot - P70, acu100, ev1

[Tom - Raymarine - Moderator]

@delightful - thank you, comments are always welcome, and you're exactly right, the two backbone terminators (120 ohm resistors) are essential for reliable network operation. They help communications chips pull the signal voltages cleanly high and low in the right timescales for reliable high-speed signalling.

@Richie-mort - moisture in the connectors shouldn't be a problem as long as it was fresh (or if salt, was washed off) and the connectors were dry before power was re-applied. If things were powered when they got damp (especially if salt-water) then corrosion would happen very quickly. If in doubt, some specialist electronics contact-cleaner (we swear by DeoxIT Gold, but anything equivalent should be good) will likely clean things up well.

Re. engine charging voltage: normal, well-regulated 13-14Vdc, no problem. The problem comes when the charging voltage is rectified but not (well) regulated, when you can get an average voltage that looks fine on a multimeter but which can contain peaks of 100V or more. Electronics are sensitive (lots of them will be damaged by even 5V) and so we have input filtering and transient voltage suppression (TVS), but we regularly see products returned for service with 60V-rated TVS components blown off the board. Simple gear such as lights and pumps will usually show no signs that there's anything unusual, and an outboard-tech's peak-hold (DVA) meter or an oscilloscope will usually be required to show what's really going on.

If you disconnect each of the 3 components from the network (and power) and measure the resistance on the CAN terminals on the back (on the end of a cable using thin wire inserted into the sockets, e.g. a paperclip or twist-tie is the easiest way), what do you get? You need to measure between CANH (white) and 0V (black) and between CANL (blue) and 0v/black, and should measure at least 400kOhms in each case. A failed CAN circuit will generally show a resistance of <100kOhms.

One device could have a random failure, but if you have failures in multiple devices then you've almost certainly had a high-voltage event which has damaged them.

Finally - not all dealers are Service dealers. The Service dealers are the ones who have the training to diagnose this sort of thing. Tick 'Certified Installation' at https://www.raymarine.com.au/view/index-id=911.html to see Service dealers.

Regards,
Tom