Engine/Transmission (1998.5 - 2002) Getting Elecrical Shock working on Truck

[grimesja]

Okay this may be adumb question but I am puzzled. I was chaging out the powersteering pump over the weekend and I keep getting shcoked on my forearms by the MAP sensor wire and other wires. I disconnected the negative side of the battery but that did not help. I had to disconnect the postive cable from both batteries for the shock not to happen. Is this normal or am I missing something? I have never had a vehicle shock me like this truck does. Any thoughts on why this happen?

 

[Road Dog]

You should disconnect the negative on both batteries. The MAP sensor uses 5 volts so I'm not sure what kind of shock you're getting.

 

[BarryG]

I changed my ps pump and repaired my vacuum pump last year and had no electrical voltage going through my body at any time. I did not unhook the positive or negative cables as I didnt feel it would be necessary (I wont say I shouldnt have unhooked them but didnt). Hopefully I am correct in assuming that you did not have the key on and as such there should not be power going through the map sensor with the key off so I would say fwiw that that is not normal. By chance could there by a direct battery connection to some added accessory that runs a wire through that area? There are several circuits on the truck, headlights for example, that are negative switched so there is positive voltage going to them all the time. All the lights on the truck may be negative switched but do not know however I think those wires are all within a large harness and unless some sort of exposed wire is there you still wouldnt get shocked by them. I am an electrical idiot though so perhaps I should just leave it at I didnt get shocked when I did my ps pump.

 

[BGlidewell]

dc less than 60 volts is usually not perceptible to bare skin

 

[mwilson]

dc less than 60 volts is usually not perceptible to bare skin

Until you involve some form of moisture, then you can feel lower voltage.



Wet feet and/or hands, sweat, road chemical treatment residue, etc. will get you connected. Nothing more than a tingle but you can feel it.

 

[grimesja]

Okay, it got even weirder this weekend. I changed by oil and got shocked when I touched the oil filter line from the turbo while removing the filter. These are all low voltage shocks but I can defintely feel them. From what I can see the grounds appear to be connected. I am working on the truck in North Florida and it is hot and humid. But I have never gotten any kind of a jolt while changing the oil filter or mesing withthe wires before. I had to disconnect the positive ternimals of the battery to get the shocking to stop.

 

[Fireman Dave]

I've gotten a little buzz before when leaning in to change the oil filter. It seems to be from leaning across the battery. If I stay off the battery, I don't get it.

 

[TJJEEPER]

By chance are you using a shop "drop light" of any kind? Is it hanging from the truck?