My information says both the Ignition wire and the starter wire in the harness are BLACK/ red. One of the two BLACK/ red wires is thicker diameter than the other.  Does anyone know which is which?
Thanks in advance.
2002 Nissan Altima
| Item | Wire Color | Polarity | Wire Location | 
| 12V | green | + | ignition harness | 
| STARTER | BLACK/ red | + | ignition harness | 
| IGNITION | BLACK/ red | + | ignition harness | 
| ACCESSORY | red | + | ignition harness | 
| SECOND ACCESSORY | none |  |  | 
| TACHOMETER | WHITE/ green |  | ECM behind glove box *4 | 
| POWER LOCK | pink *7 | - | pin 37 @ BCM by fuse box | 
| POWER UNLOCK | brown *7 | - | pin 44 @ BCM by fuse box | 
| PARKING LIGHTS + | RED / blue |  | driver kick panel | 
| PARKING LIGHTS - | none |  |  | 
| DOOR TRIGGER | *2 | - | BCM to right of fuse box | 
| HEADLIGHTS | blu (L), RED / yel (R) | + | IPDM E/R *1 | 
| WIPERS | blu (L), blu/blk (H) | - | wiper motor | 
| LF WINDOW UP/DN | blu/red - blu/wht | A | driver window switch | 
| RF WINDOW UP/DN | green - yellow *6 | A | driver kick panel | 
| LR WINDOW UP/DN | purple - blue | A | driver kick panel | 
| RR WINDOW UP/DN | RED / yel - yel/blk | A | driver kick panel | 
| TRUNK/HATCH PIN | PURPLE / white | - | pin 18 @ BCM by fuse box | 
| HOOD PIN | yellow/black | - | hood pin switch | 
| TRUNK/HATCH RELEASE | RED / blk or blu/red | - | pin 76 @ BCM by fuse box | 
| FACTORY ALARM ARM | pink/blue *3 | - | driver switch in door | 
| FACTORY ALARM DISARM | WHITE/ blue *3 | - | driver switch in door | 
| HORN TRIGGER | GREEN / WHITE | - | steering column | 
| BRAKE WIRE | RED / green | + | brake pedal switch | 
| LOCK MOTOR | yellow/red |  | pin 30 @ BCM by fuse box | 
| UNLOCK MOTOR | GREEN / WHITE |  | pin 23 @ BCM by fuse box | 
| DISARM DEFEAT | GREEN/ red |  | pin 31 @ BCM by fuse box | 
| DISARM NO UNLOCK | none |  |  | 
| DOME SUPERVISION | comes on with unlock |  |  | 
| SPEED SENSE | blue / YELLOW *5 | 8 | pin 9 @ instrument cluster | 
| SUN ROOF OPEN/CLOSE | not recommended |  |  | 
| SUN ROOF LIMIT | none |  |  | 
| LF SPEAKER | blu/wht - blu/red |  | radio or amp under rear deck | 
| RF SPEAKER | wht/blk - blu/blk |  | radio or amp under rear deck | 
| LR SPEAKER | grn/yel - blk/yel |  | radio or amp under rear deck | 
| RR SPEAKER | blue - red |  | radio or amp under rear deck | 
| RADIO 12V | YELLOW /GREEN | + | radio | 
| RADIO GROUND |  |  |  | 
| RADIO SWITCH | purple | + | radio | 
| RADIO ILLUMINATE | RED / blue | + | radio | 
| POWER ANTENNA | green | + | radio | 
|  | 
| Notes: | NOTE: This vehicle has an immobilizer system that needs to be bypassed when adding remote start. Use DEI part number 555U. *1 The IPDM E/R (Intelligent Power Distribution Module Engine Room) is under the hood behind the passenger side headlight. *2 The LF door trigger is lt. blue in pin 14, RF door is pink/blue in pin 10, and the LR and RR door is RED / black in pin 11. *3 Meter these wires while turning the key in the driver door key cylinder. These wires will also lock and unlock the doors. Unlock requires a double pulse. *4 On the 4 cylinder vehicles it is in pin 36, and on the 6 cylinder it is in pin 34. Can also go to one of the ignition coils and use the wire that is NOT red or black. *5 If vehicle has the midline audio system or BOSE, the vehicle speed sense is also found at the radio, it is pink. *6 If vehicle has auto up/down on the front passenger window switch then must go into the passenger door and use blue for up and GREEN/ black for down. *7 These wires are only available on vehicle with left front only power window anti-pinch system. On vehicles with left AND right front power window anti-pinch system, use the factory alarm arm and disarm wires for door locks. | 
Ign. is the small one!
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      I am installing an Autocommand remote starter with a DEI 556U Bypass. I finished connecting the wires and tested it out. The car just cranks and cranks and cranks but wont start. Any ideas?
      Hi, I have a 2002 Nissan Altima and when I remote start it the car starts and runs for 10 seconds or so then shuts off. If i put my key in the ignition and turn it to Run during these ten seconds it will remain running. I do not have a tach wire hooked up. I am using an autocommand remote starter and a DEI 556U Bypass. The bypass wires are connected as follows. Red- 12v Black- ground Blue- Status Output from Remote start module.
Any Ideas? Should I be looking at the bypass or something else?