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#1 |
Registered User
Join Date: Oct 2022
Location: Regina, Saskatchewan
Posts: 343
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3OTT Saginaw converted to Indy floor shifter - How to get backup lights working?
I've been working on cleaning up leaks in my Saginaw Tranny lately and I'm wondering what would be the easiest way to get my reverse lights working again?
I understand that the lights were originally connected on the column to a switch, connected to light and dark green wires. In my research, looks like the 4 speed tranny's had a switch right on the transmission that gets bumped closed when the reverse gear is selected. Is that switch possible to add to a Saginaw 3 speed? I've attached a picture also, there an opening that's plugged up that I've circled, anyone know what that opening is for? Thx!
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1971 Chev C10 - 250ci L6 w/3 speed on the floor Upgrades: Power Steering 3 Core Radiator 7 Hole Gauge Cluster Power Brakes (Incoming!!..) 1971 350 (Incoming!!..) |
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#2 |
New Member
![]() Join Date: Sep 2017
Location: Aiken, SC
Posts: 18
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Re: 3OTT Saginaw converted to Indy floor shifter - How to get backup lights working?
I made a bracket and installed a switch that gets bumped in reverse. I would love to have you're Three on the tree linkage though....
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#3 | |
Registered User
Join Date: Oct 2022
Location: Regina, Saskatchewan
Posts: 343
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Re: 3OTT Saginaw converted to Indy floor shifter - How to get backup lights working?
Quote:
The conversion to the floor shift was done along time ago before I go the truck, no linkage for the old 3OTT unfortunately
__________________
1971 Chev C10 - 250ci L6 w/3 speed on the floor Upgrades: Power Steering 3 Core Radiator 7 Hole Gauge Cluster Power Brakes (Incoming!!..) 1971 350 (Incoming!!..) |
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#4 |
New Member
![]() Join Date: Sep 2017
Location: Aiken, SC
Posts: 18
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Re: 3OTT Saginaw converted to Indy floor shifter - How to get backup lights working?
Darn it! I no longer have the truck or I would be happy to! Sorry
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#5 |
Registered User
Join Date: Oct 2022
Location: Regina, Saskatchewan
Posts: 343
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Re: 3OTT Saginaw converted to Indy floor shifter - How to get backup lights working?
No Problem!
__________________
1971 Chev C10 - 250ci L6 w/3 speed on the floor Upgrades: Power Steering 3 Core Radiator 7 Hole Gauge Cluster Power Brakes (Incoming!!..) 1971 350 (Incoming!!..) |
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#6 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,436
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Re: 3OTT Saginaw converted to Indy floor shifter - How to get backup lights working?
Is that a plug or a switch? As that is the 2-3 shift shaft it could have had a TCS switch for emissions when in 3rd gear.
You'll need to mount a micro-switch near the 1st-rev shift arm for your backup lights.
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'67 GMC 2500, 292, 4spd, AC |
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#7 | |
Registered User
Join Date: Oct 2022
Location: Regina, Saskatchewan
Posts: 343
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Re: 3OTT Saginaw converted to Indy floor shifter - How to get backup lights working?
Quote:
As for the plug, I was hoping it was a spot that I could add a reverse switch to. It looks like the hole is plugged with a cap.
__________________
1971 Chev C10 - 250ci L6 w/3 speed on the floor Upgrades: Power Steering 3 Core Radiator 7 Hole Gauge Cluster Power Brakes (Incoming!!..) 1971 350 (Incoming!!..) |
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#8 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,600
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Re: 3OTT Saginaw converted to Indy floor shifter - How to get backup lights working?
That’s the ground switch for the tcs.
You’ll need to leave it there. IIRC you can’t replace it with a normal plug. Different threads and thread pitch. Tcs wasn’t a bad thing for me. Came in handy to only have vac advance come in during highway cruise. Could optimize my timing curve without adding the timing variable of a vac pot. Worked great on my LS7 and LS6. |
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#9 |
Registered User
Join Date: Apr 2022
Location: Moorpark, CA
Posts: 755
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Re: 3OTT Saginaw converted to Indy floor shifter - How to get backup lights working?
Is the switch, 1 wire IIRC, that is on the DS, forward on the Saginaw 3 speed the "TCS" switch or the BU light switch?
I ask because I have one on my 3OTT Saginaw 72. I just assumed it's the BU light switch. My BU lights work |
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#10 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,862
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Re: 3OTT Saginaw converted to Indy floor shifter - How to get backup lights working?
On my old truck, my 64, I just said to heck with it and put a lighted Toggle to activate backup lights. I just tapped into a switched ign source and had it installed next to my wiper switch. Nice blue lite in switch let me know they were on.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#11 |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,690
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Re: 3OTT Saginaw converted to Indy floor shifter - How to get backup lights working?
Some conversion shifters had hole in the rear of shifter housing. This hole lined up with the first/reverse lever. A momentary switch could be mounted in that hole and wired to the back-up lights. Check your shifter, you may have that provision.
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#12 | |
Registered User
Join Date: Oct 2022
Location: Regina, Saskatchewan
Posts: 343
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Re: 3OTT Saginaw converted to Indy floor shifter - How to get backup lights working?
Quote:
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__________________
1971 Chev C10 - 250ci L6 w/3 speed on the floor Upgrades: Power Steering 3 Core Radiator 7 Hole Gauge Cluster Power Brakes (Incoming!!..) 1971 350 (Incoming!!..) |
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