Lowrance HDS Touch Gen2 Manual page 19

Sonar Ailments
R F I n t e r f e r e n c e - T r o l l i n g M o t o r
Try each of these possible remedies step by step
in the order they are here:-
1. Make sure all cables are in perfect order
and not damaged (especially section on
shaft of trolling motor), plug pins are not
damaged, dry inside and the plug itself
secure.
2. Make sure transducer and fishfinder power
cables are NOT neatly strapped to trolling
motor power cable in bow well.
3. Make sure Fishfinder and Trolling Motor
supply cables are not running in the same
loom from the back of the boat.
4. Earth Trolling Motor* fin to negative
(black) supply from battery going to
fishfinder with a small gauge wire
(2.5mm)
5. These steps should also sort out any
interference on the console units from the
main motor's tachometer supply.
Earth lead to Trolling motor Fin
* - This is the #1 solution to the problem of RF noise.
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