Cat 2017 259d loses power and is sluggish

[Nige]

My relays are top to bottom set up, but I will do that in the morning, if you don’t mind.

If you can post a photo of your relay setup that will help us to help you.

 

[Cgray]

I will post photos of front and back in the morning

 

[heymccall]

Nige, can you forward a copy of schematic to me?

 

[Cgray]

So, this morning, all fuses are getting 12v as well as all 3 relay pin 30 getting 12v, but no power to the plug connection for the priming pump.

 

[heymccall]

I keep seeing "mine don't look like that".
The image I posted earlier is from my 262D3, and is the same as yours, save my image only has two relays. Yours has three.
I think the issue here is that you haven't lifted the cab, as my image is the back wall of the cab, after the cab is tilted up.
I confirmed this after Nige sent the machine specific schematic.
#47, 48, & 49.

You are looking behind the cab, right?

 

[heymccall]

 

[Cgray]

Yes, behind the cab, backside of fuse box, was saying “mine doesn’t look like that”, due to having 3 relays and more cartridge fuses to be specific, but your picture may be misleading to my eyes

 

[Cgray]

 

[Nige]

OK, looking at wire colours coming out of the 3 relays in your photo above it's easy to identify which is which. They are exactly as they are laid out on the schematic. The relays supplying the two halves of the fuse panel are the centre and the RH ones.

So, this morning, all fuses are getting 12v

I'm not sure I completely understand. Does that mean you have power back to both halves of the fuse panel now.?

 

[heymccall]

 

[Cgray]

Now, as we chat, the fuses are barely getting readings, earlier this morning I was getting full voltage

 

[Cgray]

HMC, I have done that repeatedly, there’s no power going to the priming pump, it’s supposed to be clicking while it’s priming. I’ve check the voltage going to the plug and the is no power.

 

[Nige]

Now, as we chat, the fuses are barely getting readings, earlier this morning I was getting full voltage

On your photo there are some weird "colours" on some connectors around the relays. A sign of condensation/corrosion maybe.? Open everything up, get in there with aerosol contact cleaner as a start.

This situation would be especially true on a 5 year-old machine with only 180 hours on it.

 

[Cgray]

The whitish color is from the marker as a inspection check. The have green and white marks all over fittings, connections etc

 

[Cgray]

I’m getting 10.6 v at the 3 terminals and buss bar

 

[Nige]

I’m getting 10.6 v at the 3 terminals and buss bar

What do you measure across the battery temrinals.?

 

[Cgray]

11.91

 

[Cgray]

What do you measure across the battery temrinals.?

11.91

 

[Nige]

Two things IMO.
1. Your battery is goofed. Should be 12.6-12.7v when full charged.
2. You have a major voltage drop somewhere in the system if you are losing 1.3v between the battery and the fuse panel. Back to my previous comment about corrosion/contamination.

 

[Cgray]

Well, now I’m taking the fuse block off to change a stud that I broke off, and trying to get the stripped Phillips head out of the front of the fuse block…. Not a good day