Usually you can tell it is bad because it will be warm even after sitting overnight.

 

Good show Neal. You hit the nail right on the head.

Now, where does that other wire go. PCM

 

You have the charging system diagram, Robin? PS...Thanks for the kind words, coming from you it is meaningful to me.

 

I can't attach a pdf now. I was looking at the wiring diagram on ebscohost. Looks like the + off the battery going to the starter motor relay also feeds 4 fusible links. Two go to B+ at the alternator. The other two feed fuse 6 and fuse 20 (labeled battery junction box). Those also end up going to the alternator. I could send an email with the attached wiring diagram if you guys want it. PM me your email if so.

 

Yes, see below.

I can't seem too see where there are 2 wires attached to a single terminal of the starter relay on the starting system diagram.

Help me out guys. Edit: Maybe I'll figure it out if I combine the two wiring diagrams????

Damn I forgot to attach the PDFs. Wait one minute.

OK. Here they are.

 

The OP has a 2001. I sent an email to Neal so hopefully he can post that up. I'm no EE at going through wiring diagrams but can usually figure it out. Maybe I'm missing something and just confusing you guys....

 

Good work Neal, you are a great example of what FTE is about. Reps when I get out of the pokey buddy !

 

1999 to 2001 are the same. Neal has a 99. I reread your previous post and looked at the wiring diagrams again. Tomorrow I'm going to look at the real thing under the hood. That will make more sense out of this, at least for me.

No, you're not confusing me.

 

Hey are these diagrams applicable to a 2002?

 

The 2001 diagram breaks up the fuse links into four. It also didn't show the GPR but assumed the s147/s149 junction goes to the gpr. I'm sure they are the same though. I wasn't sure what the dotted line from starter solenoid to the fusible links meant. Maybe they are split before the starter solenoid??? I didn't pop my hood but will have to check it out sometime.

 

No. The 2002-03 don't have the starter relay mounted under hood on the inside of fender. The relay is a bosch type (small cube) and mounted in the under dash fuse box.

Here is a "Starting & Charging" 2002 wiring diagram from EBSCO.

 

Thanks Grant,

That dotted line is the confusing part. Looking under the hood of my truck the gray wires with the fusible links are crimped into the same round connector and on one terminal. Then there are two others also crimped together in a round terminal. As far as I got. Cold wind blowing and I wussed out and came inside. I'll Check it out later, weather permitting, but snow is expected.

 

THANKS PAYSON!!!!

 

Well I got the alternator checked out at the manufacturer. They say it checks out good and advised I checked my ignition circuit. I did that with the help of the wire diagrams provided by Payson - thanks again for those.

Ignition cicuit checks out. Fact is the alternator "turns on" and draws just shy of 0.5 amps when plugged in - even with the ignition circuit fuse pulled. The ign circuit shows 150mV with the fuse in, and 35mV with the fuse pulled. I can't beleive either of those levels is enought to activate the alt...

I push, pulled, wiggled and shook the connector and can find no indication that the connector is somehow "leaking" voltage to the ignition wire.

Looks like it is back to the alt mfg with alt installed so they can see what is going on. They seem to be dealing straight up with me, so I'm hopefull we'll get it resolved.

The only thing I've been able to determine so far is that I can make it snow simply by going outside to work on the truck.

 

You want to leave the clamp meter on the wire for about a minute some alternators take a little while to shut down completely.
,5 amp is to high if it is continuous.
I know what it is to work outside and have the weather change as soon as you are finished.