TravcoForum.com

Travco Classic Motorhome Support & Discussion Forum

Skip to content

Change font size

Board index » Interior » Electrical
Post here for living area electrical.

Neutral Safety Switch

Unread postby RobC on Tue Jun 30, 2015 4:28 pm

Lo and behold after sitting for a few months I was not getting any juice to the starter as of yesterday. I am getting ready to fire up my beast with the rebuilt TQ on top but not go.

It will crank in Neutral but not in Park. Sounds like the Neutral safety switch should be making contact on both the Neutral and Park position.

I am hoping it is just the switch and not the linkage inside.

Anybody experienced this?

RobC

PS Manual says pull the plug and inspect to make sure the contacts are centered on the hole in Park and Neutral. My tranny is going to get rebuilt here pretty soon but I sure would like to know why no Park starting.
RobC
Senior Contributor
Senior Contributor
 
Posts: 239
Joined: Mon Jul 01, 2013 2:30 pm
Travco Model: 1976 270

Re: Neutral Safety Switch

Unread postby Acesneights on Wed Jul 01, 2015 3:50 pm

Let us know, I have never personally messed with it. It might be on the shifter ???
1975 Travco 270
1974 Travco 220 Parts unit
User avatar
Acesneights
Site Admin
Site Admin
 
Posts: 1755
Joined: Tue Jan 22, 2013 7:01 am
Location: North East Ct
Travco Model: 1975 270,1974 220

Re: Neutral Safety Switch

Unread postby RobC on Wed Jul 01, 2015 5:22 pm

Figured it out.

There are two mechanical contact points inside the transmission attached to the shifter lever mechanism. When in Park or Neutral the contact points touch the center pin on the neutral safety switch grounding it to the transmission case and completing the circuit to the starter relay and allowing the starter relay to do its job.

"Full power to the starter Scotty"

In any other position R D 1, 2 or 3 there is no contact, no ground and no go.

"I'm givin it all she's got Captain... ya can't change the laws of physics...."

The switch only completes the circuit to the starter relay so you can shift all you want while its running.

The fix was to clean all the dirt and oil and crap off the selector lever area on the drivers side of the tranny. It was pretty gnarly down there (**** with Simple green, toothbrush and follow with some carb cleaner). I then "aggressively" put the beast into and out of park a few times. the Park position is all the way back on the tranny lever and It was probably just not quite getting there (see **** procedure above).

Problem solved. Bottom line is that the selector lever pin and seal are probably worn out and a rebuild will fix that but for now I am mobile.

Two birds with one stone: I have a tranny fluid leak somewhere down there in that area. Enough to drip a few times a day onto the exhaust pipe which upon start and warm up makes for a very dramatic smoke show for about 5 minutes in the driveway. The leak is one of the following:
1) forward oil cooler line fitting
2) Kickdown adjustment bolt
3) Selector switch pin seal or kickdown pin seal

Now that is all hospital clean down there I may be able to actually see where the oil is coming out.

Stay tuned.

RobC
RobC
Senior Contributor
Senior Contributor
 
Posts: 239
Joined: Mon Jul 01, 2013 2:30 pm
Travco Model: 1976 270


Return to Electrical

Who is online

Users browsing this forum: No registered users and 3 guests