I am putting my truck back together after paint and am running into a problem with my wiring harness. The truck is a 1970 f250 hiboy with a 4 speed manual transmission.
I am using parts form a 1970 f250 2Wheel drive truck. The harness in the 4x4 manual was a little rough so I was going to use the nicer 2wd auto harness instead. Now that I have the 2wd harness in the truck I didn't think about the neutral safety switch. I have found through search that you can jump the neutral safety so it will start in any gear but I will lose my back up lights or have to wire them into a switch.

The 4wd manual harness has a two wire connector on the driver side firewall that runs to the top of the transmission. The 2wd harness has the same two wire connector but has a jumper that connects the two.

I Have two questions:
#1 On the 2wd auto harness Can I jump the neutral safety switch across and plug from the firewall to the two wire connector to the transmission to make it all work?
#2 Can I use the Manual column and wiring with the automatic harness without too much trouble?

Thanks!

 

Wiring on these old trucks was pretty simple, you can do most anything that you want and it will work. I have a 76 column with a not used NSS in my 66. A switch is a connection point to allow something to happen.


John

 

Pretty sure all the harness connections are the same. At least in the few that I've worked on. The NSS and back up lights is a flat 4 pin. Two for NSS, two for BU lights. I've swapped 4 spds into automatic trucks. Just made a jumper for the NSS connections. I've also run the two BU lights to the shifter switch(Hurst 4spd) and made them work.

The column should not make a difference, only if it is a different year. They changed turn signal wiring slightly in the years.

 

I gather it is "still" a granny gear 4 speed? If so the switch on the tranny is for backup lights only. 4 speed trucks have no NSS so jump across the two connections on the A/T harness that would have been going to a NSS. and then connect the two wires leading to the tranny's b/up switch to the other two pins on where there would have been a A/T NSS.