You're right for low speed.
High won't come on naturally till about 226* and you probably haven't let it get that hot. When high kicks on, CCRM Pin 14 goes cold and Pin 17 shows continuity to ground.
Dealing with only low for right now:
If Pin 14 shows 12 volts, check CCRM Pins 1 and 2 for 12 volts. If you have that, the issue is between the CCRM and fan.
You've got it Matt. Just ground the neg lead. I ground mine either on the engine or a bolt at the front clip. If using the engine, watch that you dont get the lead tangled in the alternator, etc.
A safety pin works well for getting through the wiring insulation. If you wrap electrical tape around the pin, sans the very tip and the curved end (so you can put your meter lead on the pin), it helps prevent a short if the pin moves around.
A safety pin works well for getting through the wiring insulation. If you wrap electrical tape around the pin, sans the very tip and the curved end (so you can put your meter lead on the pin), it helps prevent a short if the pin moves around.
You might be right about the PCM being at fault. I've seen similar issues where a speed would not activate at a given threshold but could otherwise be commanded to work.
If you do have a spare Moates chip (sounds like you don't), then I'd just do a burn - treat it like a one speed fan, and get the high speed setting down to like on/off 195/187, respectively (for a balanced 180 stat).
If you do have a spare Moates chip (sounds like you don't), then I'd just do a burn - treat it like a one speed fan, and get the high speed setting down to like on/off 195/187, respectively (for a balanced 180 stat).
Sorry Matt, I totally missed the Cobra tune. You are right - low speed on a Snake is 216/212. High speed is the same for GT's and Snakes.
A Moates chip was 70 bucks when I got mine. For like 35 and some shipping, you can get a module that lowers the fan thresholds by like 15*F (to accomodate a drop from a 195* stat to a 180* stat). I havent used the latter though. I think I'd rather have a nice tune on the Snake anyhow however.
Sorry again. I had GT on the brain.
A Moates chip was 70 bucks when I got mine. For like 35 and some shipping, you can get a module that lowers the fan thresholds by like 15*F (to accomodate a drop from a 195* stat to a 180* stat). I havent used the latter though. I think I'd rather have a nice tune on the Snake anyhow however.
Sorry again. I had GT on the brain.