RAM 1500 Van V6-239 3.9L Magnum (1995)
Ignition Switch: Description and Operation
Ignition Switch Circuit
When the ignition switch is in the RUN position, it connects circuit A2 from fuse 2 in the Power Distribution Center (PDC) to circuit A22. Fuse 2 is a 50
amp fuse and protects circuits A2 and A22.
Circuit A22 connects to a bus bar in the fuse block. The bus bar feeds circuits C1, F21, F20, and A20. Circuits CI, F20, and A20 are protected by
separate fuses. A circuit breaker in cavity 8 protects circuit F21.
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Fuse 7, 30 amp, protects circuit C1. Circuit C1 feeds the blower motor switch (heat only), A/C-Heater control vacuum switch and the auxiliary
A/C and heater relay
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The 30 amp circuit breaker in cavity 8 protects circuit F21. Circuit F21 feeds the power window switches.
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Fuse 6, 10 amp, protects circuit F20. The F20 circuit is double crimped at the fuse. One branch of circuit F20 feeds the heated rear window switch.
The other branch feeds the back-up lamp switch (part of the park/neutral position switch).
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Fuse 5, 5 amp, is only used on vehicles with the Anti-Lock Brake System (ABS). The fuse protects circuit A2O. Circuit A2O provides an input to
the ABS control module and splices to the ABS power relay and the ABS warning lamp relay.
Circuit A22 also splices to fuse 1 in fuse block. Fuse 1 protects circuit F23 which feeds the Airbag Control Module (ACM).
In the START position, the ignition switch connects circuit A1 from fuse 7 in the PDC to circuit A41. Circuit A41 connects to the coil side of the engine
starter motor relay
Also in the START position, the ignition switch provides ground for the brake warning lamp switch, parking brake lamp switch, and connects to the ABS
module or Rear Wheel Anti-Lock (RWAL) module.
In the START or the RUN position, the ignition switch connects circuit A1 from fuse 7 in the PDC with circuit A21. The A21 circuit splices to the fuse
block, the Automatic Shut Down (ASD) Relay fuel pump relay, TCC relay, and data link connector. Circuit A21 also powers the EVAP/Purge solenoid,
EGR solenoid, overdrive solenoid, and the A/C system.
At the fuse block, circuit A21 connects to a bus bar that feeds circuits F14, V34, and G5. Each circuit is protected by a separate fuse.
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Fuse 17, 5 amp, feeds circuit G5. The G5 circuit powers the seat belt buzzer circuitry in the combination buzzer, the overdrive switch, and
connects to the instrument cluster and message center.
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Fuse 18, 2 amp, feeds circuit V34. Circuit V34 powers the vehicle speed control switch.
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Fuse 19, 15 amp, feeds circuit F14 and a branch of circuit G5. Circuit F14 connects to the ACM. Circuit G9 connects to the instrument cluster.
In the ACCESSORY or RUN position, the ignition switch connects circuit A1 from fuse 7 in the PDC with circuit A31. Circuit A31 connects to a bus
bar in the fuse block that feeds circuits X12, V6, L5, and F30. Each circuit is protected by a separate fuse.
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Fuse 9, 15 amp, feeds circuit F30. Circuit F30 powers the cigar lighter.
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Fuse 10, 20 amp, feeds circuit V6. Circuit V6 powers the wiper system.
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Fuse 11, 10 amp, feeds circuit X12 which powers the radio.
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Fuse 12, 20 amp, feeds circuit L5. Circuit L5 powers the turn signal flasher, RWAL control module, and the coil side of the van conversion relay.
