Datasheet for the 97-EHD series 97-Series Alternators
Extra large case 97-Series Alternators provide outputs of 160 amps at 12 volts, or 140 amps at 24 volts. 4”ID J-180 saddle mount. Alternators feature isolated ground terminals, external regulation and 16-pole stator output. Models with a BL indicates brushless rotor/ stator combination that reduces alternator noise, and eliminates key wear points.
1. Positive Output Terminal - Must be connected via properly-sized cable to the battery or batteries being charged. Cable size is determined by alternator output and length of cable run. See Page 3.
2. Negative Terminal (Ground) - Must be connected to system ground via properly sized cable. Cable size is determined by alternator output and length of cable run. See Page 3.
3. Stator Output - Can be used as a signal for an electric tachometer. In 12-volt systems, stator terminal will connect to WHITE wire. In 24-volt systems, the Stator Wire will connect to the ORANGE wire in the regulator wiring harness.
4. External Field Terminal - Connects to external voltage regulator via wiring harness.
An unsupported cable may damage the positive or negative terminals, resulting in damage to alternator, regulator and wiring. Ensure that cables are adequately supported to supply strain relief.
Alternator models designated as Isolated Ground (IG) feature an independent ground terminal that’s isolated from the alternator case. Isolated Ground alternators are used in applications where the engine is not desired to be a part of the grounding system. This is commonplace in steel or aluminum hull boats, or with engines that depend on sophisticated electronic ignition systems. In other applications, isolated grounding simply ensures that the alternator is sufficiently connected to system ground. The alternator’s ground cable should be the same size as the alternator’s positive output cable.
Tech TipTo meet ABYC standards the wire to the battery must have circuit protection. The level of circuit protection must be equal or less than the ampacity of the wire. To prevent accidental tripping the circuit protection should be a bit more than the rated output of the alternator, maybe 30% more would be appropriate
When sizing the output wire of this alternator the ampacity of the wire must at least meet the output of the alternator, see the Ampacity Tables for details. Ideally though the wire size would be closed to the 3% Voltage drop rule, see the Voltage Drop Tables for details. A 5005 or 5191 fuse block would be appropriate. Don't forget a cable cap for the output terminal which the ABYC requires for all exposed positive terminals. A 4012 Cable Cap might be appropriate depending on the wire size you end up choosing.