Re: Dumb reverse lights....
[Re: sharpie]
#336840
06/03/09 07:30 AM
06/03/09 07:30 AM
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Joined: Apr 2003
Posts: 821 On the open road
Hrtbkr
super stock
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super stock
Joined: Apr 2003
Posts: 821
On the open road
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I just worked through this problem. If you have (I"m not sure of the exact year for the change) a '70 or older transmission, the switch in the side is only for neutral safety. The reverse lights are switched either at the floor or column shifter. The trans switch for the older style had a single connector. You can install a newer three prong switch, but then you get the symptoms you describe. To fix this, you need two friends like I have. Darryl GAVE me the correct valve body (the cam on the shifter rod activates the safety and back up lights plus you get part throttle kick down), and you need Kenny to install it. Automatics are a complete mystery to me , but Kenny swapped VB's last night like it was nothing...
While outside on the turnpike
They got this new hit tune
Where thrills become as cheap as gas
And gas as cheap as thrills
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Re: Dumb reverse lights....
[Re: Hrtbkr]
#336841
06/03/09 08:38 AM
06/03/09 08:38 AM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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yes if it on the colum at the floor you need the one wire nss like said the rooster comb is diff for the 3 prong nss you can move the rev light switch for some adjustment on the colum some..that might help the trans you took out would have the nss and correct vb,but I know you said it gone so its just a matter of the right nss maybe find out if its got the rev light switch on the colum
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Re: Dumb reverse lights....
[Re: sharpie]
#336843
06/03/09 11:32 AM
06/03/09 11:32 AM
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Joined: Nov 2004
Posts: 9,312 SoCal
68HemiB
master
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master
Joined: Nov 2004
Posts: 9,312
SoCal
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Indeed, the rooster comb inside can vary, but I am not sure that this should come into play, given the years of the parts you used. IIRC, '68 was the last year of the single pin NSS and reverse lights from elsewhere.
It would be very useful diagnostic information if you could establish that the switch and comb are or are not truly the source of your problem. Doing so might avert the need to start digging into the internals of the transmission needlessly.
I would suggest that you disconnect the harness plug from the switch, and use an ohm meter to establish if the outer two pins in fact have continuity in reverse/drive/2/1 and no continuity in park and neutral (matching your symptoms).
a. If this is the case, it's bad news and time to dig further into the switch integrity and switch/comb interaction.
b. However, if the outer pins behave as they should (continuity in reverse, and no other gear), you can breathe a sigh of relief and continue your search external to the transmission itself.
Down to just a blue car now.
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Re: Dumb reverse lights....
[Re: sharpie]
#336851
06/03/09 05:48 PM
06/03/09 05:48 PM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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pull the vb and install the new 3 prong nss rooster comb in you vb I have the right rooster comb if ya need it the vb is for parts so I dont need it its yours if ya want it
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Re: Dumb reverse lights....
[Re: stumpy]
#336855
06/03/09 10:39 PM
06/03/09 10:39 PM
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Joined: Nov 2004
Posts: 9,312 SoCal
68HemiB
master
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master
Joined: Nov 2004
Posts: 9,312
SoCal
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Referring back to my earlier post... ...it's easier to yank the valve body of a transmission than to hold the probes of an ohm meter up to two pins on the NSS?
Down to just a blue car now.
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Re: Dumb reverse lights....
[Re: sharpie]
#336857
06/04/09 08:09 AM
06/04/09 08:09 AM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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IMO the rooster comb is easier to do than rewire the rev light circit the detent ball is the hardest thing to deal with changing it its 12 or so bolt that hold the vb in place and you can put a new throttle valve shaft seal in there while your at it
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Re: Dumb reverse lights....
[Re: sharpie]
#336858
06/04/09 10:56 AM
06/04/09 10:56 AM
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Joined: Nov 2004
Posts: 9,312 SoCal
68HemiB
master
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master
Joined: Nov 2004
Posts: 9,312
SoCal
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Quote:
I am thinking it's pretty solid that I have the wrong NSS switch in there, because I've seen the inside of the transmission (and thus the shift lever) when I was reconditioning it. Since the only real difference between 69+ NSS is 1- or 3-pin and thus the part that touches the switch (rooster comb seems to be the same), I really think it's the switch. How would I go about re-routing the reverse light circuit? It seems easier to get a 1-pin NSS switch and reroute the reverse light circuit than to replace the shift lever and valve body.
Some members (myself included) are a bit confused how such a late transmission could have an early roostercomb. You know more about the ancestry of the transmission, have seen the innards for yourself, and seem to buy onto the "wrong comb" theory, even without testing with an ohm meter. So be it.
Assuming that your problem is a comb/NSS mismatch (as I said - a leap for some of us), the task at hand is to match the NSS and car wiring to the comb, or the comb to the NSS and car wiring. I think I join the majority here in thinking that the latter is the easier path. Your idea to search out a single pin switch leaves you needing a whole 'nother set-up to get your reverse lights working. In a column-shifted automatic, this was done with a switch near the bottom of the steering column. And it is not just a switch and some wires - there needs to be a matching pin-like thing on the shifter linkage to engage the switch. The sarcastic side of me wants to recommend you seek out a "1968 Demon" to gather your needed parts...
I would urge you to confirm your problem first. THEN, if it really is a comb/switch mismatch, reconsider going the comb changing route.
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