Special Tools
DMT 2004 Digital Multimeter 91‑892647A01
A
C O
M
m
A
V H z
mV
V
H z TEMP
m A
A
IG
IP
OFF
H z
TEMP
4516
Measures RPM on spark ignition (SI) engines, ohms, amperes, AC and DC
voltages; records maximums and minimums simultaneously, and accurately
reads in high RFI environments.
CDS G3 Interface Kit 8M0138392
CDS G3 License Key, Interface, Adapter, and Harness
Electrical System Troubleshooting
General Checks
Before troubleshooting the power trim electrical system, check for the following:
• Disconnected wires
• Battery is fully charged
• Battery cable connections are tight and corrosion‑free
• Battery cables are secured with hex nuts, not wing nuts
• Connections are tight and corrosion‑free
• Plug‑in connections are fully engaged
• Clean power is connected
Condition/Problem
Condition of Trim System
Problem No.
Trim motor does not run when trim button is depressed 1, 2, 4, 5, 6, 7
Trim system trims opposite of buttons 3
Cowl‑mounted trim buttons do not activate trim system 2, 4, 5, 6
Problem/Solution
No.
Problem Solution
1. Battery low or discharged Check the battery.
2. Open circuit in trim wiring Check for an open connection.
3.
Wiring reversed in remote control, cowl switch, or trim
leads
Verify connections.
4. Wire harness corroded through Replace wire harness.
5. Internal motor problem (brushes, shorted armature)
Check for an open connection. Test and replace the power trim
motor if necessary.
6. Trim switch failure Replace the switch.
7. Relay not operating
Verify relays are functioning correctly. Check voltage at the
power trim bullet connectors.
Power Trim Electrical Circuit
IMPORTANT: Numerical callouts shown in the circuit diagrams are test points. Refer to Troubleshooting the Down Circuit or
Troubleshooting the Up Circuit.
Conventional Midsection (CMS) Power Trim
Page 6C-2 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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