Calling all electrical gurus - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Cowdogpete · 04-09-2016, 08:43 AM

The only fault I have with my recently acquired 1984 K20 (and is no fault of the trucks) is that it has the dimmer switch on the column.

Has anyone retrofitted a floor dimmer in one of these trucks?
ANyone have the color codes for the wires on the dimmer? Know the easiest access point to tap them?

US automakers getting rid of the floor dimmer has always been a pet peeve of mine. I hate them on the column!

Thanks for your help!

**hatzie** · 04-09-2016, 08:56 AM

The column mounted dimmer is fairly easy to replace.

The 1984 Service and Wiring manuals are in my signature.

Cowdogpete · 04-09-2016, 01:15 PM

Quote:

Originally Posted by hatzie

The column mounted dimmer is fairly easy to replace.

My column mounted dimmer works fine, I just dont like it there.
Want to retrofit the floor dimmer.

I'll check out the diagrams. Thanks.

Pyro · 04-09-2016, 07:12 PM

Super easy to do. On the column switch you'll find a connector with 3 wires in it, tan, light green, and blue. Snip those 3 wires and run them down to the floor dimmer switch you want to use. It hooks up basically the same way. The blue wire will be on the cavity by itself and the tan and green will be in the other 2 cavities. The tank and green can be put in either cavity, doesn't actually matter, all the switch does is switch the current from the blue wire into either the tan or green wire.

Cowdogpete · 04-09-2016, 08:08 PM

Quote:

Originally Posted by Pyro

Super easy to do. On the column switch you'll find a connector with 3 wires in it, tan, light green, and blue. Snip those 3 wires and run them down to the floor dimmer switch you want to use. It hooks up basically the same way. The blue wire will be on the cavity by itself and the tan and green will be in the other 2 cavities. The tank and green can be put in either cavity, doesn't actually matter, all the switch does is switch the current from the blue wire into either the tan or green wire.

Awesome...THANKS!

Titomars · 04-09-2016, 11:35 PM

Quote:

Originally Posted by Cowdogpete

US automakers getting rid of the floor dimmer has always been a pet peeve of mine. I hate them on the column!

Thanks for your help!

Mine too! Actually I'm not a fan of the wipers on the column either. But i really hate the dimmer up on the column.

**hatzie** · 04-10-2016, 11:16 AM

Quote:

Originally Posted by Titomars

Mine too! Actually I'm not a fan of the wipers on the column either. But i really hate the dimmer up on the column.

The world would be a boring place if we all liked the same things...
I like the column dimmer.
The floor buttons seemed to get dirty and crunchy awfully quick on the farm trucks.

04-09-2016, 08:43 AM	#1
Cowdogpete Registered User Join Date: Apr 2016 Location: Bosque County, TX Posts: 40	Calling all electrical gurus The only fault I have with my recently acquired 1984 K20 (and is no fault of the trucks) is that it has the dimmer switch on the column. Has anyone retrofitted a floor dimmer in one of these trucks? ANyone have the color codes for the wires on the dimmer? Know the easiest access point to tap them? US automakers getting rid of the floor dimmer has always been a pet peeve of mine. I hate them on the column! Thanks for your help!

04-09-2016, 08:56 AM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,941	Re: Calling all electrical gurus The column mounted dimmer is fairly easy to replace. The 1984 Service and Wiring manuals are in my signature. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

04-09-2016, 07:12 PM	#4
Pyro Registered User Join Date: Jul 2004 Location: New Boston, MI Posts: 71	Re: Calling all electrical gurus Super easy to do. On the column switch you'll find a connector with 3 wires in it, tan, light green, and blue. Snip those 3 wires and run them down to the floor dimmer switch you want to use. It hooks up basically the same way. The blue wire will be on the cavity by itself and the tan and green will be in the other 2 cavities. The tank and green can be put in either cavity, doesn't actually matter, all the switch does is switch the current from the blue wire into either the tan or green wire.



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