My 2007 Wrangler Unlimited X will sometimes not start in park but when I put the shifter into neutral it will start. (Automatic trans)

 

i spent 3 months chasing intermittent start issues end of the day it was the battery. problem was that the battery was showing just over 12 volts on a good multimeter. Even different meters to be sure. When it did start. it started fine. Other times had to put it in 4 low, so I thought it was the neutral or clutch switch. NOTHING indicated battery.
Took it to the dealers and they put the battery on a artsy fartsy teaster than ran cycles for 24 hours, at least that is what they told me. Techy guy came out and said "well, technically your battery is 12 plus so theoretically it is OK, BUT it is only holding a few amps"
Fast forward, I installed Optima yellow top and not had any issues since.
Digging around it appears that Jeeps like ours need more oomph than the OEM battery provides.
Get the battery properly tested, not an auto store fancy meter test OR if your battery is older, go straight for a new one and at the very least eliminate that in the trouble shooting nightmare

 

I was able to determine that it is my neutral safety switch. Sometimes even though I'm in park the safety switch is a tad off and thinks I'm in gear. If I push forward on the shifter while in park it will start. Or I can put it into neutral then back into park and it will start. At least I know what it is

 

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