How to Install a Bow-Mount Trolling Motor

Set the motor on the bow, stowed, with the help of a friend. Minn Kota's quick-release instructions recommend placing it as close to the boat's centerline (keel) as practical. The mount must sit on a flat, solid area. On pontoons, use the maker's pontoon mounting instructions or adapter, and bolt into the deck structure, not just the decking surface.

Deploy and stow the motor by hand (not bolted yet) and check:

• The shaft and motor clear the bow edge, rub rail, bow eye and anchor gear when deploying and stowing. Makers specify a minimum clearance between the bow and the motor column; check your instructions.
• The stowed motor head and lower unit don't hang where they'll hit a dock, trailer winch post or the anchor.
• The pedal or remote, cables and wiring have room to run without being pinched.
• You can reach the deploy handle without leaning out over the bow.
• The stowed motor doesn't block your bow navigation light. BoatUS's project writer notes that if it does, take the motor off before running after dark.

Angled bow or bow rail? Bow-mount motors are designed for a flat bow with no rail. In a BoatUS project, the writer made the mount level with a bent aluminum plate through-bolted with a backing plate, and got past a bow rail by cutting a short section out and covering the gap with a sliding stainless sleeve held by quick-release pins. A rail is a safety handhold, so if you're not comfortable modifying it (or the rail is part of the boat's structure), have a rigging shop do it or choose a different mount position.

Look under the deck at each planned bolt location. Make sure the bolts won't come through the hull or hit bulkheads, wiring, hoses or a fuel line, and that you can reach the underside for nuts and a backing plate. If you can't reach, pick another spot or use the maker's accessory for that boat type.

A quick-release bracket lets you lift the motor off the boat for storage, security or trailering. Minn Kota lists brackets matched to different motor models. Some motors must use specific holes: for certain Minn Kota motors on a quick-release, only the four rear base holes are used so the shaft has proper clearance when deployed. A quick-release adds height, so recheck shaft length and clearance with it in place.

Use the base (or quick-release) as a template and mark the holes. Tape helps on gelcoat. Drill straight down. On fiberglass, makers commonly suggest countersinking the top of each hole slightly so the gelcoat doesn't crack. If the deck has a wood or foam core, protect it: drill oversize, fill with thickened epoxy, let it cure, then drill the bolt holes (see the through-bolting accessories guide).

Use through-bolts, not screws, and all the bolt holes the instructions call for, spread as far apart as practical. Minn Kota offers a deck reinforcement kit; otherwise use an aluminum or marine-grade plastic backing plate under the deck to spread the load. Seal each hole, fit washers and locknuts underneath and tighten evenly. If the deck isn't flat, shim the base as the instructions describe: a mount bolted down crooked can bind and be hard to deploy or stow.

Decide where the trolling batteries go (often in a compartment near the bow, but follow your boat's layout and weight balance). The longer the run from batteries to motor, the heavier the wire needs to be. Minn Kota says its motors come with 5-foot 10-gauge leads and gives a chart for the wire gauge to use when extending them, based on the motor and the extension length. It recommends a qualified marine technician for extensions over 25 feet. See the trolling motor wiring guide for battery banks and charging.

Minn Kota recommends a circuit breaker or inline fuse on the positive lead, as close as possible to the battery or batteries. Size it from the motor maker's chart, not by guesswork. Minn Kota's MKR-27, for example, is a 60-amp manual-reset breaker, and Minn Kota says breakers larger than 60 amps should not be used on its QUEST motors. Smaller motors may call for a smaller breaker. Connect the motor's positive cable to the breaker's motor/auxiliary side and the battery side to the positive post, as the breaker's instructions show.

A plug and receptacle lets you disconnect the motor at the bow. Pick one rated for your motor's current and voltage; Minn Kota's MKR-28, for example, is rated to 60 amps up to 48 volts. Mount the receptacle where it stays dry, use the dust cap, and make every crimp solid with heat shrink. A cheap or worn plug is a common cause of heat and power loss.

Make all connections with the motor off. For 24 or 36 volts, connect the batteries in series exactly as the maker's diagram shows. Minn Kota says batteries in a bank should be the same make, type, size and age. Keep the trolling bank separate from the cranking battery unless the motor maker's instructions show otherwise. Check voltage and polarity at the plug with a multimeter before you connect the motor.

With the motor deployed in water deep enough to cover it, run it briefly at low speed. Check steering both ways, that the stow and deploy latch works, and that cables don't snag. Don't run the motor out of water unless the maker allows a brief check. On the water, run it at full speed for a while, then feel the cables, plug and breaker: they may be warm but should never be hot. Recheck mounting bolts after the first few trips.

If your motor has GPS anchoring or heading lock, it needs setup on your boat before those features work properly. MotorGuide's Xi Series FAQ, for example, calls for a compass calibration (driving slow circles) and a "keel" calibration that tells the motor which way is straight ahead, and says to redo them whenever the motor moves to a different boat. It also warns that routing cables the wrong way past the motor head can cause interference with the GPS. Follow your motor's manual for the exact procedure and cable routing, and do it in open water clear of obstructions.