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Why is it dying
Posted by: paulurban ()
Date: April 12, 2018 07:47AM

This is my first Corvair and first post.
1966 Monza 110. 57,000 miles, runs pretty good but developed a habit of dying. Totally dead, no electric, nothing. I have replaced the entire wiring harness, thought this solved the issue, but it did it again yesterday in the garage right when I put it in reverse. Few minutes of pulling and pushing wires, checking whatever I could think of, it just came back to life.
This is a problem as it can die in the middle of a busy road.
Any suggestions besides red battery wire?
Thanks
Paul

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Re: Why is it dying
Posted by: MattNall ()
Date: April 12, 2018 07:53AM

Welcome to the CCF!

Normally this is the main harness connector in the engine compartment [ large red wire there ]

Got a Voltmeter and Wiring diagram? You need them to trace power..





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Why is it dying
Posted by: monza66mo ()
Date: April 12, 2018 07:57AM

I'd start with the main body connector at the firewall. Even though you replaced the entire harness, one of the connections inside the connector may have some crud. Separate the connection and look closely at both male and female pieces. Try some quick dry spray electrical cleaner.

- Art in Missouri
'61 Loadside

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Re: Why is it dying
Posted by: steve c goodman ()
Date: April 12, 2018 07:57AM

Welcome to CCF. You are saying no electric to anything including headlights/warning lights on dash/no horn/no starter?

First question would be what do you do to make everything work again? (before harness swap} Actually what place did you wiggle/pull/push to make it work? Was it the same place after new harness?

PG or stick trans?

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC



Edited 2 time(s). Last edit at 04/12/2018 08:01AM by steve c goodman.

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Re: Why is it dying
Posted by: monza66mo ()
Date: April 12, 2018 07:58AM

Ah, Matt (as usual) is quick on the draw!

- Art in Missouri
'61 Loadside

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Re: Why is it dying
Posted by: RobertC ()
Date: April 12, 2018 08:40AM

IMO you answered your own question...

The large red wire from the battery (POS post) is usually cut when a new battery cable is installed.

If not crimped correctly, it can come loose - cutting power to the whole car as you experience.

Re-crimp or replace the connection.

As others have stated, the wiring harness connector can be the problem, also.

Probably should check the "post" on the frame rail that the red wire connects to, also.



Edited 1 time(s). Last edit at 04/12/2018 08:42AM by RobertC.

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Re: Why is it dying
Posted by: 66vairman ()
Date: April 12, 2018 08:54AM

Most don't replace the harness that goes through the service tunnel from the back to the front of the car.

As Matt said the big connector between the engine and tunnel harness may be the problem. The bigger red main power wire goes through that connector and the contacts get corroded and overheat and sometimes the connector plastic housing melts and causes an intermittent connection. So if you plug in a new engine wire harness into the old tunnel wire harness you may still have a problem.

I've fixed a number like that - I just pull the bigger red wires from both connectors and join them with a 50 Amp fuse and holder. AGU type is easy to find.

BTW the smaller wire from the battery positive cable was originally a fuseible link and usually when the batter cable is replaced the link is lost and replaced with regular copper wire - so the fuse at the connector offers some protection.

If there is a Corvair club in your area then you might join. My local club has "garage runs" were folks help each other out with problems.



Edited 1 time(s). Last edit at 04/12/2018 08:56AM by 66vairman.

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Re: Why is it dying
Posted by: paulurban ()
Date: April 12, 2018 01:10PM

PG Trans
When it dies it nothing works.

To get it back to life, I just started at the battery and looked over the new connections.
Sounds like I may be looking at replacing rest of harness up to the front.

Is this a major job ?

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Re: Why is it dying
Posted by: steve c goodman ()
Date: April 12, 2018 01:36PM

paulurban Wrote:
-------------------------------------------------------
> PG Trans
> When it dies it nothing works.
>
> To get it back to life, I just started at the
> battery and looked over the new connections.
> Sounds like I may be looking at replacing rest of
> harness up to the front.
>
> Is this a major job ?

Steve sez: You stated in first post 'replaced entire
wiring harness'. How much did you actually replace?
Just the engine bay harness?

You say above 'looked over new connections'. Did you
just look or did you wiggle/unplug/re-plug the harness
plugs?

How did you know the car had power again?

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC

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Re: Why is it dying
Posted by: Frank DuVal ()
Date: April 12, 2018 02:31PM

HRPT.

Horrible Red Plastic Thingy

Did you replace or clean the HRPT? aka the single screw red plastic terminal near the battery? This is where the smaller wire from the positive battery terminal first attaches.

Frank DuVal

Fredericksburg, VA

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Re: Why is it dying
Posted by: corvairpaddock ()
Date: April 12, 2018 02:49PM

I had the problem with the NEG wire, Not the cable , that was not grounded to the body

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Re: Why is it dying
Posted by: RobertC ()
Date: April 12, 2018 02:52PM

paulurban Wrote:
-------------------------------------------------------
> PG Trans
> When it dies it nothing works.
>
> To get it back to life, I just started at the
> battery and looked over the new connections.
> Sounds like I may be looking at replacing rest of
> harness up to the front.
>

Why don't you fix what is wrong?

If wiggling wires / connections allows the car to start again; then, replacing the harness from the engine compartment to the front will only result in a new wiring harness from the rear to the front.

The places to check have been posted multiple times.

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Re: Why is it dying
Posted by: 66vairman ()
Date: April 12, 2018 05:32PM

Frank DuVal Wrote:
-------------------------------------------------------
> HRPT.
>
> Horrible Red Plastic Thingy
>
> Did you replace or clean the HRPT? aka the single
> screw red plastic terminal near the battery? This
> is where the smaller wire from the positive
> battery terminal first attaches.

I always thought that was an AWTH (accident waiting to happen)

or FWTH (fire waiting to happen).

Ranks right up there with the battery terminals next to the engine lid prop and a missing battery hold down!

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Re: Why is it dying
Posted by: JimBrandberg ()
Date: April 13, 2018 05:17AM

To repeat what others have said, I would check the positive junction at the frame rail and I would check the red wire at the big junction block.
Sometimes I will just splice in a by-pass or it might be a good idea to install some sort of a super-fuse at the same time.
Someone also said to check the grounds, also a good idea.
I don't think I'd replace the whole body harness just to correct one bad connection.
Again, I'm just repeating what others have already said.

I bought a new plasting thingy a few years ago and couldn't get it installed without breaking. It could be me rather than a flawed part. I have trouble getting new cars apart with the snap together plastic.

Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: Why is it dying
Posted by: 66vairman ()
Date: April 13, 2018 07:25AM

JimBrandberg Wrote:
-------------------------------------------------------
> To repeat what others have said, I would check the
> positive junction at the frame rail and I would
> check the red wire at the big junction block.
> Sometimes I will just splice in a by-pass or it
> might be a good idea to install some sort of a
> super-fuse at the same time.
> Someone also said to check the grounds, also a
> good idea.
> I don't think I'd replace the whole body harness
> just to correct one bad connection.
> Again, I'm just repeating what others have
> already said.
>
> I bought a new plasting thingy a few years ago
> and couldn't get it installed without breaking. It
> could be me rather than a flawed part. I have
> trouble getting new cars apart with the snap
> together plastic.
>
> Jim Brandberg
> Isanti, MN
> CorvairRepair.com

Yes the replacement red plastic terminal is fragile, I've broken one as well.

The tunnel harness is difficult to replace, unless the car is all apart, then it's easier. I have replaced all the Packard "Twin Lock" terminals and plastic connector. Not as bad as it sounds if the engine is out to make room and you have the correct crimp tool.

If the big red wire connections is the only issue, it's more practical to just do a by-pass with that wire out of the connectors.

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Re: Why is it dying
Posted by: flamingchariots ()
Date: April 14, 2018 10:18AM

I don't think you stated if you cleaned (with a battery terminal brush) both the connectors and posts on the battery.

Sometimes "looking" clean isn't enough, and will result in sporadic electrical problems.

Also, replacement connectors on the ends of the battery cables are useless, IMO.
Buy new cables.

Kevin
Medina, OH

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