Well i checked all the connections mentioned cleaned the main ground to engine it was already pretty nice added one at the front and the rear of the block to the chassis still no good. i forgot to mention the only codes are 12 and 55 so no help there, i am stumped at the moment any more input would be great.

 

So is the voltage fall-off a cause, or a result? Have you cleaned the throttle body?

 

Well i don't really seem to have a voltage fall off it just stalls. i can drive the truck down the road fine up here in the country it shifts idles pulls fine, but if i brake it stalls if i turn on the headlights it will stall headlights and blower it stalls faster. so it seems like a voltage drop but my multimeter shows it never goes much below 13.7v until the engine dies out. this is a really odd issue! i cleaned the throttle body and iac last fall they were not very dirty but i did them anyways just for maint reasons it idles smooth as glass till you brake or put an electrical load on it. i really thought the newer battery would do it or that the alt might be bad but it seems to be charging ok.

 

Have you had the alternator load tested?? Doesn't seem like you will be able to do that on the truck..... Probably kill it as well.

 

just had the alt tested it is good....i am going to pull the power distribution box and look at the wires underneath to see if there is any green nasty on the terminals next. hope i fine something soon.

 

Well the box looks really good no dirty connections of any corrosion. got to say i am stumped at the moment.

 

Voltage Regulator?

 

You may want to see if you can get a voltage reading at the pins going into the pcm. Seems like the pcm is regulating the voltage but there may be an internal issue with the pcm.

 

I had a 95 chevy truck, and at the time it was 8 years old. The ground cable looked fine, as did the connections. However it was starting a little weird. One morning I noticed a wif of smoke from the front of the hood when I started it... Popped the hood and I saw a nice shiny copper wire running across the front of the rad.... here it was finding ground through the horn and the wire got so hot it melted the insulation right off the wire! I grabbed the ground cable to move it out of the way, and it was actually crunchy inside. Looked great on the outside, so my first run through didn't catch it. Lesson learned, visible might look great - yet might not be.

 

I totally agree!! There is something very simple that is wrong, electricity will find the easiest path to ground,

obviously when he puts a load on the system, it’s pulling power from some vital area causing the engine to die.

Its a 1995 truck, the PCM has one ground and two power supplies , one power supply is a full time, the other is a start/ run supply. The sensors on the engine have a 5 volt supply, if one of those sensors is grounding shorting out the 5 volt supply somewhere it will kill the engine


that 5 volt supply runs, map,tps,IAC,Cam and crank sensor. I would concentrate on crank 5 volt supply. You could start the engine and disconnect the cam sensor and the engine will run all day as long as you don’t shut it off!!

ok so start with the 5 volt supply for map,TPS, or IAC, splice a volt meter into the 5 volt supply wire run it into the cab and watch it while you drive. If it drops voltage when the engine dies that’s the problem now you will have to find the short

one of my buds has a 2005 LJ Jeep , every time he washes it the engine does all kinds of weird stuff.

TPS connector was filling with water, the 5 volts was shorting out.
All it takes is a little water


If you had a DRB III you could monitor that while driving

viperdave