Wiring
WARNING: Disconnect the battery or power source before beginning the installation. For battery igni-
tion systems, disconnect the battery ground strap. Face adjusted pointer type contacts are pilot duty.
Do not exceed contact ratings on any swichgage
®
model.
20 and 25 Series models wire leads are 18 AWG or 20 AWG, 12 in. (305 mm) long. A20 and A25 Series models have number 4 or number 6
screw terminals. When installing the Swichgage instrument on an ungrounded panel, you MUST provide a ground wire from the Swichgage
instrument to a common ground. Install ONLY in a 12 or 24 V system. Warning lights or audible signal must be of the same voltage as the
battery. Current draw should never exceed Swichgage contact ratings.
CAUTION: Ordinary incandescent lights are damaging to Swichgage contacts. We recommend using our direct connected
alarms TL-7 flashing lamp and/or SAH mini-siren.
The pictorial below shows typical wirings for each base model. Look for specific typical wiring diagram with your base model number and wire
accordingly. The pointer is shown in the Shelf Position. Face adjusted pointer type contacts are rated pilot duty 2 A @ 30 VAC/DC. Snap-switch
contacts are rated 3 A @ 30 VDC; 4 A @ 125 VAC.
CAUTION: On some models pointer contact and ABS switch share the same Common. Voltage source must be the same.
Maximum voltage is 30 V. Consult factory for applications with 120 VAC systems.
Troubleshooting
SYMPTOM
CAUSE
TEST/REMEDY
Engine will not start
1. Short or open circuit, be sure the magnetic switch latches and puts out
power to the run device or removes ground (ignition). Check for power/
ground at run device
2. Control circuit overloaded by accessories (blown fuse in magnetic
switch)
3. False ground in control circuit
1. Reset magnetic switch and make sure it stays latched.
Refer to installation instructions for 518PH magnetic
switch (provided with unit).
2. Find blown fuse and replace (use 14 A fuse). Reroute the
accessories.
3. Repair.
False shutdown
1. Swichgage circuit has intermittent open or short
2. Vibration causes the Magnetic Switch to trip
1. Check all wiring and repair/replace as necessary.
2. Repair and relocate the switch as needed.
Swichgage closes but
does not trip the magnet-
ic switch or kill the engine
1. Incomplete shutdown circuit
2. Dirty Swichgage contacts
3. Ignition not providing power to primary terminal post
4. Swichgage case may not be grounded
5. Incorrect magnetic switch for type of power
1. Locate open circuit and repair.
2. Clean and check that contacts make.
3. Repair ignition.
4. Ground case.
5. Replace with correct magnetic switch.
Magnetic switch tripped
but engine is still running
1. Open circuit between the magnetic switch and the shutdown device
2. Lost ground to kill the engine
1. Check wiring from magnetic switch to shut-down device,
repair or replace.
2. Check all wiring and connections and repair.
Pointer will not operate
properly, inaccurate
reading
1. Frozen pointer
2. Loose pointer spring (caused by hitting or dropping gage)
3. Plugged pressure orifice
4. Over Pressure
1. Return for repair or replacement.
2. Return for repair or replacement.
3. Remove and clean.
4. Return for repair or replacement.
Pointer/contact burned-in
two
Without exception this condition is caused by incorrect wiring or short
circuit
Recheck wiring; replace Swichgage or return for repair.
DO THIS FIRST:
3
Look for broken wiring, frozen pointer, dirty contacts (will not make), burnt pointer or contact.
3
Verify that all wiring is intact and connections are tight.
3
Verify that Swichgage has not been damaged (hit or dropped).
3
Verify that there is pressure/vacuum supplied to the gage.
3
Verify that the Swichgage is operative (it reads).
3
Verify that the alarm or shut-down device is fully operable, and check components such as spark plugs, ignition, fuel pump and filter, etc.
3
Reset magnetic switch and verify that it stays latched.
ENOVATION CONTROL CORPORATE HEADQUARTERS
5311 S 122ND EAST AVENUE
TULSA, OK 74146
918-317-4100
FOR MORE INFORMATION:
www.fwmurphy.com
To order call 1-800-548-1191 or visit www.partdeal.com - [email protected]
