Battery & Charging Systems
Battery banks, alternators, regulators, shore chargers, DC-DC chargers, charging faults, and performance testing.
San Francisco Bay Area
Marine Electrical Diagnostics & Repair
Troubleshooting, repair, commissioning, and system evaluation for recreational and commercial vessels.
Alameda · Oakland · Berkeley · Richmond · Sausalito · San Francisco Bay Area
Marine Electrical Services
AC and DC electrical troubleshooting, repair, system upgrades, and commissioning.
AC & Shore Power
Shore power, inlets, breakers, grounding, GFCI protection, transfer equipment, inverter/chargers, and AC distribution.
DC Electrical Systems
Distribution panels, busbars, circuit protection, switching, wiring faults, voltage drop, and critical circuits.
Lithium Systems
LiFePO4 conversions, BMS integration, charging compatibility, alternator protection, and commissioning.
Navigation & Communications
NMEA 2000, VHF, AIS, GPS, antenna systems, network faults, and equipment integration.
Corrosion & Stray Current
Bonding systems, galvanic protection, hull-potential testing, stray-current investigation, and abnormal anode loss.
Electrical Diagnostics
Electrical faults are tested under operating conditions to identify the source of the problem before equipment is repaired or replaced.
Electrical Testing
AC and DC voltage, current, voltage drop, contact resistance, conductor resistance, leakage current, and parasitic loads.
Thermal Imaging
Thermal evaluation of connections, breakers, conductors, charging equipment, shore-power components, and distribution systems.
Battery & Power Analysis
Battery and charging-system testing, AC power quality, generator output, inverter performance, and load response.
Networks & Communications
NMEA 2000 and CAN Bus diagnostics, VHF antenna testing, feedline evaluation, SWR, and RF performance.
Corrosion Testing
Hull potential, bonding systems, galvanic conditions, stray-current investigation, and galvanic-isolator performance.
System Verification
Testing under actual operating conditions to verify system performance and confirm corrective work.
Documentation & Findings
Findings can be documented when required for repair planning, system upgrades, maintenance records, surveys, insurance-related work, or future service.
- Measured electrical values
- Photographs and thermal images
- Observed deficiencies
- Recommended corrective actions
- System mapping and circuit documentation
About Sure Shot Marine
Jeremyn Horsley — Owner & Lead Marine Electrician
Sure Shot Marine is an owner-led marine electrical business serving recreational and commercial vessels throughout the San Francisco Bay Area.
Jeremyn is an ABYC Certified Marine Electrician and electrical engineer. His background includes industrial electrical power and commissioning, Navy aviation electronics, and Coast Guard navigation, communications, and electronic systems.
- ABYC Certified Marine Electrician
- B.S. Electrical Engineering — San Francisco State University
- U.S. Coast Guard — Electronics Technician
- U.S. Navy — Avionics Technician
Owner Led
Customers work directly with the people performing the work.
Customers work directly with the people performing the work.
Additional Support
Jeremyn works alongside Ryan Thurm, a longtime friend and former Coast Guard shipmate, when project scope requires additional support.
Jeremyn works alongside Ryan Thurm, a longtime friend and former Coast Guard shipmate, when project scope requires additional support.
Request Service
Call or text to discuss the problem and schedule service. Photos and a brief description of the issue are helpful when available.
Serving Alameda and the San Francisco Bay Area.