400TH Kickdown Wiring - Fused/Relayed or not? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sick472 · 07-05-2020, 02:50 PM

I have a Turbo 400 in my 72 now and will be adding the kick down switch at the gas pedal. I can't find any Chevy diagrams (if it's in my assembly manual...It's hiding real good).

I think I know that it needs IGN switched power, but does it get fused (if so, what size fuse?)?

Should it utilize a relay? I'm sure I have seen the kickdown relays NOS for sale. Not that I have to be 100% concourse correct, but I do want to do it right.

72LB · 07-05-2020, 03:04 PM

Depends on if you have an older 400 or newer. When the 400 in my 69 went south I had a newer one here in the shop I had rebuilt. It required a kickdown as the older one didn't. I went with the Lokar kickdown kit, All you had to do is run a wire to a switched connection at the fuse block and the other went to the sender on the trans.

https://www.speedwaymotors.com/Lokar...20(Feb28_2020)

BigBird05 · 07-05-2020, 03:43 PM

Fig.36 & fig. 37 of the 72 service manual. 18 ga pink to the pedal switch, 18 ga org. from the pedal out to the trans conn.

sick472 · 07-05-2020, 04:40 PM

Thanks folks... Does the pink wire have a fuse inline? I assume 18 ga wire does not need to be relayed.

**HO455** · 07-05-2020, 06:09 PM

My 67 doesn't have a fuse or a relay. Neither does my GTO. The coil in the transmission draws very little current.

BigBird05 · 07-05-2020, 08:25 PM

The pink wire plugs into the fuse box. No inline fuse, no relay.

07-05-2020, 02:50 PM	#1
sick472 Registered User Join Date: Jul 2015 Location: Sedalia Mo. Posts: 1,131	400TH Kickdown Wiring - Fused/Relayed or not? I have a Turbo 400 in my 72 now and will be adding the kick down switch at the gas pedal. I can't find any Chevy diagrams (if it's in my assembly manual...It's hiding real good). I think I know that it needs IGN switched power, but does it get fused (if so, what size fuse?)? Should it utilize a relay? I'm sure I have seen the kickdown relays NOS for sale. Not that I have to be 100% concourse correct, but I do want to do it right. __________________ He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20

07-05-2020, 03:04 PM	#2
72LB Registered User Join Date: May 2017 Location: Inman/Boiling Springs, SC Posts: 420	Re: 400TH Kickdown Wiring - Fused/Relayed or not? Depends on if you have an older 400 or newer. When the 400 in my 69 went south I had a newer one here in the shop I had rebuilt. It required a kickdown as the older one didn't. I went with the Lokar kickdown kit, All you had to do is run a wire to a switched connection at the fuse block and the other went to the sender on the trans. https://www.speedwaymotors.com/Lokar...20(Feb28_2020) __________________ 1985 C10 shortbed, current project. Member of the Upstate SC GM Truck Club.

07-05-2020, 03:43 PM	#3
BigBird05 Registered User Join Date: Aug 2019 Location: Cheraw Posts: 1,300	Re: 400TH Kickdown Wiring - Fused/Relayed or not? Fig.36 & fig. 37 of the 72 service manual. 18 ga pink to the pedal switch, 18 ga org. from the pedal out to the trans conn.

07-05-2020, 04:40 PM	#4
sick472 Registered User Join Date: Jul 2015 Location: Sedalia Mo. Posts: 1,131	Re: 400TH Kickdown Wiring - Fused/Relayed or not? Thanks folks... Does the pink wire have a fuse inline? I assume 18 ga wire does not need to be relayed. __________________ He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20

07-05-2020, 06:09 PM	#5
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,351	Re: 400TH Kickdown Wiring - Fused/Relayed or not? My 67 doesn't have a fuse or a relay. Neither does my GTO. The coil in the transmission draws very little current. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

07-05-2020, 08:25 PM	#6
BigBird05 Registered User Join Date: Aug 2019 Location: Cheraw Posts: 1,300	Re: 400TH Kickdown Wiring - Fused/Relayed or not? The pink wire plugs into the fuse box. No inline fuse, no relay.

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