I would just have gotten a pig-tail to hook up a 2 amp slow charger to my trailer wiring, and back-fed the distribution block. It would give enough juice to work the door solenoids.
And if left long enough, it would charge the battery too.
No muss, no fuss, no crawling under.
Except that the trailer light circuits only have power when the truck's lights are turned on. The trailer brake, signal, and parking lights are all triggered by relays, and with the truck's battery dead, there's no connection back to the battery, so that wouldn't work unless the lights were left on and if the relays aren't normally open (which they are).
Even if he hasn't got a trailer plug, the wiring is just hanging up there above the frame rail.
Also, IMHO hooking a jumper cable to the starter lug is asking for trouble...way too much potential to touch a ground source down there and make big sparks.
More of an issue than, oh, say, jump-starting a dead battery with the hood open??? How? If you're connecting the jumper cables properly, the cables are DEAD when you connect it to the dead vehicle's battery or, in this case, the starter cable. There's no chance of anything sparking or grounding out.
You took my advice to the poster out of context, and suggest that I say inept and so on and so on - Fact is that poster should just call for help. End. I don't mean to insult the poster, but when people lock their keys in the car, it's best to call for help - I never implied anyone was or is inept.
Then why does he need to call for help? He did ask for help:
HERE.
There are people that have done damage to their vehicles, and injured themselves trying to get in to their car using these methods. Pay somebody $25-$50 and get into your car. This is just drama... some of us can break into cars, some can't. Those who try should read your disclaimer before continuing.
He is appealing to
US for help, and that's what I'm trying to do. That's why this board exists. Rick started working on his truck and discovered he needed the knowledge of others to help him get out of his pickle. The original poster is in the same boat as I'm sure Rick was back in the day.
If the original poster is anything like me, why in God's green Earth would someone pay $50 when 5 minutes and a set of jumper cables will accomplish the same thing? (not sure where you live, but around here, try $120 for an on-site call and an hour's worth of labor) I'm sure he's well-aware he could call a locksmith, but he chose to ask us if there might be an alternative: There IS. It's simple, poses no more risk than jump-starting a dead battery, and only requires that he get ever-so-slightly dirty laying underneath it. If he thinks he's capable of doing it, great. Go for it. If not, he can still call a locksmith or AAA.