Finally! GMT800 style towing mirrors on GMT400.

[88GMCtruck]

I'm waiting until I have the time, I'm hopingthere's a jumper inside I can access that will allow me to split it in 2: half blinker, half running light.

No, not without cutting up the circuit boards.

Oh, wondering how the backup lights are on them too. Cant wait for my set to come in. Ill worry about wiring later when theres more wiring info out there to go by.

The backup lights IMO aren't impressive. I was hoping for something better TBH.

If only I was that resourceful. I have this weird contradiction in my head - because I have heated mirrors stock, I have to replace it with such. I know.. makes zero sense.. don't ask. Electronics and wiring, and me, don't get along. So I'll either wait for power heated options on the 88-98 base, or go with the GMT800 style mirrors... unless there is K2XX style mirrors, with 88-98 base, with an 8 pin connection.

You put your existing 8 pin onto the new mirrors regardless of what they come installed with. No cutting required.

The 99-02 mirrors use the same 8-cavity plug as the late GMT400 with heated mirrors does. The pins will probably still have to be swapped. 03+ used an entirely different plug setup.

Keep in mind the GMT400 and GMT800 use different version of a mirror switch and one function will be swapped, so basically up on the switch moves the glass down, and vice versa. There is no way around it short of swapping the entire mirror motor or putting a GMT800 switch in your truck.

just ordered 2 sets of mirrors! the power old style ones for the base and the loaded k2xx with the 99-02 base, going to swap and sell other set.....shipped today, excited to see how they look

Read the reply above about the mirror adjustment. You'll probably want to fully take the mirrors apart and put the motors in the correct respective mirror otherwise you are going to have one heck of a mirror adjustment mess for both.

 

[Stepside_fever95]

No, not without cutting up the circuit boards.


The backup lights IMO aren't impressive. I was hoping for something better TBH.



The 99-02 mirrors use the same 8-cavity plug as the late GMT400 with heated mirrors does. The pins will probably still have to be swapped. 03+ used an entirely different plug setup.

Keep in mind the GMT400 and GMT800 use different version of a mirror switch and one function will be swapped, so basically up on the switch moves the glass down, and vice versa. There is no way around it short of swapping the entire mirror motor or putting a GMT800 switch in your truck.


Read the reply above about the mirror adjustment. You'll probably want to fully take the mirrors apart and put the motors in the correct respective mirror otherwise you are going to have one heck of a mirror adjustment mess for both.

Do you have a diagram for how you wired the turns, marker, and reverse lights?

 

[88GMCtruck]

I did not make one because everyone wants to wire theirs differently and does so differently. Last time I tried it was just too much to keep explaining and people not understanding.

 

[Sampuppy1]

Those little rear facing lights are not reverse lights. They're in too small of a housing to be useful for backing up. The three 2015-2016 we have for plowing they either come on with the dome or have manual activation.

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[88GMCtruck]

My understanding is they were designed to only activate in reverse or with the cargo light.

Directly from GM's website:
Power-adjustable, heated, outside vertical trailering mirror featuring an embedded turn signal, an LED Rear Guidance Lamp, plus amber running lamps, with manual folding and manual extending capability.
-Include an LED Rear Guidance Lamp for backing up (helps to see trailer when backing up with a trailer) and amber auxiliary clearance lamp
-Have manual folding and manual extending capability
-Include integrated turn signal indicators
-Consist of 51 square inch flat mirror surface positioned over a 24.5 square inch convex mirror surface with a common head (lower convex glass is not heated and not power adjustable)

Sounds like a backup light to me.

Just because they are small doesn't mean they can't work as backup lights. They just need to be designed well.

 

[nickthehick78]

got first set today. look and feel very good. i was worried being from ebay they would be super cheap and flimsy. feel solid and stout. this is the set im taking the bases off for my 96 truck and selling....if the other mirrors are nice looking when i get them.

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[nickthehick78]

Read the reply above about the mirror adjustment. You'll probably want to fully take the mirrors apart and put the motors in the correct respective mirror otherwise you are going to have one heck of a mirror adjustment mess for both.[/QUOTE]

thank you. ill dig in to them when the other set comes. i ran into the same kind of problem when i got an aftermarket power(extend/retract) antenna and wired to a factory 80 corvette wiring....the relays were off, i would turn radio on and ant would close and radio off it would extend....spent hours chasing it and ended up pulling new motor apart and changing wiring in it and got it to work right! hopefully i can figure out a fix for this. if i do ill let you know.

 

[nickthehick78]

by the way, 88GMCtruck....awesome write up! thanks for all the pic's and info! makes buying ebay stuff, or wondering, humm wonder if i can do this or that with it, alot easier when spending hard earned money. love real reviews and seeing the parts blown apart to get ideas....

 

[Sampuppy1]

My understanding is they were designed to only activate in reverse or with the cargo light.

Directly from GM's website:
Power-adjustable, heated, outside vertical trailering mirror featuring an embedded turn signal, an LED Rear Guidance Lamp, plus amber running lamps, with manual folding and manual extending capability.
-Include an LED Rear Guidance Lamp for backing up (helps to see trailer when backing up with a trailer) and amber auxiliary clearance lamp
-Have manual folding and manual extending capability
-Include integrated turn signal indicators
-Consist of 51 square inch flat mirror surface positioned over a 24.5 square inch convex mirror surface with a common head (lower convex glass is not heated and not power adjustable)

Sounds like a backup light to me.

Just because they are small doesn't mean they can't work as backup lights. They just need to be designed well.

That sounds about right

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[Stepside_fever95]

Anyone have a diagram or something showing how the plug has to be repinned so the power adjustment works? I have the k2xx mirrors.