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Discussion Starter #1
My 2008 Pilot SE AWD will not start. I replaced the battery and Alternator a week ago. Car ran fine. Now, nothing happens when I try to start it. What could this be?
 

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Were you getting sluggish starts before replacing the battery and alternator? My wife’s Pilot was taking about a second longer than normal to crank. Initially replaced the battery which seemed to resolve things for a couple weeks, then the issue came back. Replacing the starter resolved it. If you have a voltmeter you can do some quick checks to make sure it’s not the starter relay prior to replacing the starter. My Pilot had 102k miles at 14 years when the starter was replaced. It’s about a two hour job first time around if you DIY.
 

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Discussion Starter #4
i wasn’t getting sluggish starts. I was able to jump start it, so it must not be a starter issue. I’m going to look into the AC relays and battery cables.
 

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Hold right there. If you were able to jump start, then it would be a battery issue.
Take a multimeter and measure the voltage across the battery posts. You should read 12V when the car is turned off and 14-14.5V when the engine is running.
If you install a new battery and it drains, then either your alternator is dead or you have a load which stays on when the car is turned off. Aftermarket alarms are notorious for the latter.
 

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Since OP already replaced the battery and alternator last week I’m guessing there is a parasitic draw on the system. Easiest way to check is to put the multimeter into millivolts DC mode and measure voltages across the fuses. The Pilot needs to be off with no key in the ignition while measuring. Any fuse with a reading out of line with all other measurements points to a current draw on that circuit.

If OP was able to jump start the dead battery, and presumably drive the Pilot around the block, it seems the alternator and cabling & fuse between the alternator and battery positive are functioning. Voltage measurements across the battery, once the battery is charged, would verify this.

OP, you will likely need to charge the battery prior to measuring voltages across the fuses and verifying the charging system.
 

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Discussion Starter #7
Since OP already replaced the battery and alternator last week I’m guessing there is a parasitic draw on the system. Easiest way to check is to put the multimeter into millivolts DC mode and measure voltages across the fuses. The Pilot needs to be off with no key in the ignition while measuring. Any fuse with a reading out of line with all other measurements points to a current draw on that circuit.

If OP was able to jump start the dead battery, and presumably drive the Pilot around the block, it seems the alternator and cabling & fuse between the alternator and battery positive are functioning. Voltage measurements across the battery, once the battery is charged, would verify this.

OP, you will likely need to charge the battery prior to measuring voltages across the fuses and verifying the charging system.
Thank you for the suggestion. I’m still getting this issue intermittently so I’ll take your advice and check the fuses. Something IS slowly draining the battery.
 

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Thank you for the suggestion. I’m still getting this issue intermittently so I’ll take your advice and check the fuses. Something IS slowly draining the battery.
Intermittent sounds like it could be a poor battery cable connection or corroded cable. Double check the battery connections and also the negative ground connections. Sometimes the stranded copper of the negative cable can corrode and start to break away near the frame connection. The battery terminal clamps can stretch and no longer grip the terminals, even though they look good.
 
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