Jeremyn Horsley

Marine Electrical Troubleshooting & Systems Diagnostics

San Francisco Bay Area

Services

Marine electrical troubleshooting and onboard systems diagnostics for sailboats and powerboats. Emphasis on safety, reliability, and clarity of installation.

Serving Alameda · Oakland · Berkeley · Richmond · Sausalito · San Francisco Bay Area marinas

Services

Electrical Troubleshooting

Intermittent faults, dead circuits, breaker trips, voltage drop, parasitic drain, and corrosion-related failures.

Charging & Battery Systems

Alternators, regulators, shore chargers, DC-DC charging, battery banks, and charging performance verification.

Lithium Battery Conversions

LiFePO4 system design, charging source compatibility, BMS integration, alternator protection, and conversion from lead-acid with proper system verification.

Shore Power & AC Systems

Inlet and distribution faults, nuisance trips, GFCI and galvanic protection verification, and grounding and bonding evaluation.

Corrosion & Stray Current Diagnostics

Hull potential measurement, stray current testing, galvanic isolator verification, and bonding system evaluation using a silver/silver chloride reference electrode.

Power Quality Analysis

Shore power voltage and frequency verification, harmonic distortion, voltage drop under load, and identification of power quality issues affecting sensitive electronics and charging systems.

Thermal Imaging

Infrared inspection of panels, connections, and wiring under load. Identifies hot spots, failing terminations, and overloaded circuits before they become failures.

NMEA 2000 & Electronics

Backbone power issues, terminations, topology errors, device dropouts, and network voltage verification.

Bilge & Critical Circuits

Bilge pumps, float switches, alarms, auto/manual logic, feed integrity, and corrective wiring work.

Wiring Cleanup & Documentation

Circuit tracing, labeling, termination upgrades, routing improvements, and correction of unsafe modifications.

System Mapping

Panel circuit index, battery and charging path documentation, shore power path, and annotated photo set delivered as a PDF.

Communications & Navigation Systems

VHF, AIS, SSB, and GPS antenna system testing, feedline integrity, radio installation and verification, chartplotter integration, and diagnosis of range or performance issues.

Rates

Diagnostic Session initial

$400 flat — up to 2 hours on site. Includes measurements, fault isolation, and a findings summary.

Service & Corrective Work hourly

$160 per hour. Corrective work, upgrades, system consulting, and troubleshooting beyond the initial session.

System Mapping documentation

Starting at $750 depending on vessel size and complexity. Includes a panel circuit index, battery and charging path, shore power path, annotated photos, and a PDF deliverable.

Electrical Condition Report documentation

Formal written assessment of onboard electrical system condition. Useful for insurance documentation, vessel sale, or establishing a baseline before refit. Delivered as a PDF. Priced per engagement depending on vessel complexity.

Starting at $350

Travel within the central San Francisco Bay Area is included. Extended travel may be billed separately.

Electrical Watchkeeping

A scheduled monthly or biweekly visit covering shore power status, battery voltage, bilge pump and float switch operation, charging system condition, and visible wiring or corrosion concerns. After each visit you'll receive a written condition report and photo documentation.

Monthly 1× / month

Shore power status, battery voltage, bilge pump and float switch verification, visible leaks and water intrusion, dock lines and chafe inspection.

$125 / month

Biweekly 2× / month

Same scope as monthly. Recommended for higher-risk vessels or extended owner absence.

$200 / month

Storm / Heavy Weather per visit

Post-weather check for lines and chafe, water intrusion, shore power status, and bilge condition.

$75 / visit

Seasonal Check one-time

Single visit at the start or end of season. Shore power, battery condition, bilge systems, and general electrical status — with a written report delivered after the visit.

$150 / visit

Watchkeeping visits are condition monitoring and do not replace required maintenance, surveys, or mechanical repairs. Corrective work is scheduled and billed separately.

Scheduling

Provide marina location, description of the issue, and photos of affected areas when reaching out. Phone, text, or email all work.