Cooling fan circuit on 6.2L

[Matthew Jeschke]

Thanks for the tips on sourcing wire!

Anybody have the PN / Connector End view for the GMT900 fan connectors?

The plan is to, rebuild the fan harness 8 gauge wire... Or 10 if driven by connector limitations, more in a sec.

I'm getting ready to order the pins for the fan connectors. I don't have access to the FSM for the GMT900 though. I've found the terminal pins and wire gaskets for the GMT800 on Mouser.com However, they're spec'd to accommodate 12 to 14 gauge wire (GMT800 harness uses a 13 gauge). NOT the 8 to 10 gauge I need to run.

If I had the aptiv part number (shown below) from the "connector end views" in FSM for GMT900 I could order the terminals for larger gauge wire. The GMT900 uses 10 gauge in the fan harness.

Item | Aptiv

Explore product details, technical drawings, and related items.

www.aptiv.com

 

[Doubeleive]

Thanks for the tips on sourcing wire!

Anybody have the PN / Connector End view for the GMT900 fan connectors?

The plan is to, rebuild the fan harness 8 gauge wire... Or 10 if driven by connector limitations, more in a sec.

I'm getting ready to order the pins for the fan connectors. I don't have access to the FSM for the GMT900 though. I've found the terminal pins and wire gaskets for the GMT800 on Mouser.com However, they're spec'd to accommodate 12 to 14 gauge wire (GMT800 harness uses a 13 gauge). NOT the 8 to 10 gauge I need to run.

If I had the aptiv part number (shown below) from the "connector end views" in FSM for GMT900 I could order the terminals for larger gauge wire. The GMT900 uses 10 gauge in the fan harness.

View attachment 486445

Item | Aptiv

Explore product details, technical drawings, and related items.

www.aptiv.com

https://www.ebay.com/sch/i.html?_nkw=2008+tahoe+electric+fan+harness&_sacat=0&_from=R40&_trksid=p2334524.m570.l1313&_odkw=TP-Link+Omada+EAP660+HD+mounting+bracket&_osacat=0

 

[Matthew Jeschke]

I found it...

2012 Cadillac Escalade EXT (6.2L) Right hand side fan

APTIV connector terminal 15476168

Mouser order page

Accommodates down to a 9 gauge wire.

Unfortunately the terminals are out of stock everywhere. I may have to order the ones from your eBay link and dissect them... sigh.

Thanks for the link!

 

[Matthew Jeschke]

Del City and Waytek are my sources for stuff like wiring and associated stuff like terminals, connectors, tools, etc.

Dang these sites are GREAT especially Waytek. Only thing looks like order minimums are 100ft on most wire. My plan is to build a drop in harness upgrade with factory fitment. If I'm able to accomplish that then I may order from them and build these harnesses for my friends.

https://www.waytekwire.com/catalog/wire-and-cable/automotive-cross-link-wire

8 Gauge GXL Cross-Link Wire - 100 Feet | Del City

Enhance your engine compartment wiring with our durable 8 gauge GXL wire, featuring medium thickness insulation for superior protection against moisture, solvents, and high temperatures up to 125°C. Perfect for demanding applications, this 100-foot spool offers reliability and longevity.

www.delcity.net

ebay has gxl wire..
search popped up delcity.net

Ordered mostly from eBay as I can typically get in smaller lengths. I'll probably just order there for my prototype.

Thanks!

 

[Fless]

This one?

15476168-L | Delphi GT 630 Female Silver Plated Terminal (Loose Piece)

15476168-L in stock. Orders placed before 2pm PST ship same day. Free U.S. shipping on orders $125 or more.

www.customconnectorkits.com

 

[Matthew Jeschke]

This one?

15476168-L | Delphi GT 630 Female Silver Plated Terminal (Loose Piece)

15476168-L in stock. Orders placed before 2pm PST ship same day. Free U.S. shipping on orders $125 or more.

www.customconnectorkits.com

You're awesome! This website is another great resource. Thanks! Mouser is out of stock, I put an order into them. If they had them they'd be a fraction that cost.

Just seconds ago I ordered 8 gauge GXL wire to see if SOMEHOW that terminal will accept a TOUCH bigger than 9 gauge wire (it's spec'd max). 8 gauge would be ideal IMO, although probably not necessary, as current per wire will be half what it was on the feed line which is 8 gauge. Which writing this, perhaps it wouldn't hurt to up the feed line to 6 gauge, it does heat up. I'd wanted to get the Black, Yellow, Gray, and light blue to match the factory but that would have cost several hundred dollars so just got a 25' of black and 25' red for now.

Now I put in order at your link / custom connectors to get the remaining parts.

I'm quickly getting a fair amount of money tied up in this...

 

[Fless]

Now I put in order at your link / custom connectors to get the remaining parts.

Hopefully they come through for you!

 

[LsHart]

I've seen those. I'm trying to keep an as factory configuration as possible. However, maybe worth canibalizing one of those for the wire... Otherwise my next question was... where can somebody get 8 or 10 gauge bulk GLX J1128 compliant wire or otherwise for under hood conditions?

Yes, we sell it a Forklifts ETC. up in the good ole Memphis. We have a website and will ship it. We make hydraulic hoses too!

 

[Matthew Jeschke]

Oh cool. What's your website?

I ordered just whatever colors on eBay but really need to order correct colors to maintain factory wiring diagram if I build harness kits.

 

[LsHart]

Forkliftsetc.net

 

[Matthew Jeschke]

AI lead me down a rabbit hole insisting there's a recall of sorts on GMT800 / GMT900 fan relays due to melting issue. After much searching I found no evidence of this being the case. *sigh* Did find some interesting info though...

Electric cooling fan melted relay - LS1TECH - Camaro and Firebird Forum Discussion

Conversions & Swaps - Electric cooling fan melted relay - On my 59 Suburban with 2004 5.3 we used a single electric cooling fan. We wired it with 10 gauge wire to a 40 amp relay. After two years the relay melted at connectors 30 and 87. The wire connected to these terminals was also charred. Do...

ls1tech.com

Quite a few people did melt their fan circuit doing eFan upgrades. One person speculates older motors draw more current... Could quite possibly be the case. I also drive off road a LOT. Possibly mine got caked with dust.

Interesting chart I found elsewhere.

 

[mikez71]

Neat chart!

AI has led me down a rabbit hole too..
It's a know-it-all, that doesn't know when to say it doesn't know...

 

[Marky Dissod]

One person speculates older motors draw more current.

Not speculation. Fan motors that work well, so long as they do, won't draw 'much' more current than they did when new ...
until they approach end-of-service, when the amount of current drawn noticeably increases.

 

[Matthew Jeschke]

Neat chart!

AI has led me down a rabbit hole too..
It's a know-it-all, that doesn't know when to say it doesn't know...

After a hour of trying to find AI's phantom TSB I got a chart lol

Not speculation. Fan motors that work well, so long as they do, won't draw 'much' more current than they did when new ...
until they approach end-of-service, when the amount of current drawn noticeably increases.

Seems like a stretch to me too. Persons talking about it said something about bearing wear / drag. All the automotive electrical motors I've taken apart seem to fail due to brush wear with bearings in great shape. Unless dirt got in my fans somehow I don't see a bearing going out and if it did, I'd imagine it'd fail in a matter of minutes while making a lot of noise.

 

[Scrappycrow]

Interesting chart I found elsewhere.

As an engineer, I dig it! The most interesting part is that the current approaches the fuse rating, but never actually gets there.

 

[mikez71]

Are your fans old? Possible they will cause overheating on the new relay wiring as well?

I opened one up just now.. (I already bought new motors so I don't have to re-assemble this one!)
This one was somewhat scratchy feeling, and was a little squeaky too.
But all my old fan motors feel scratchy when turning by hand.. I guess that is just brushed motors..

(2nd version 700W motor.)

 

[Fless]

Seems like it wouldn't be all that difficult to measure the actual current draw.

 

[Matthew Jeschke]

Yeah measuring current draw is simple enough. I'll do that.

Although I'd be really curious about what these fans looked like on the inside! You could rebuild that! Really cool!

I've rebuilt a starter before. It's a similar motor in concept. You replace the brushes. I also lightly sanded the commutator. Lastly you can check the friction surfaces / bearing & shaft. If they're not scarred it could be something else... if they are scared can lightly polish, put a little silicone or lithium grease and put it back together.

I also tried to rebuild window regulator motors. The brushes fail on them. I think our trucks have Siemens motors for those. The design is such you need a jig to put it back together. I cannot recall what bits I couldn't get enough fingers to hold for reassembly.

Thanks @mikez71