Photobucket
Members Login
Post Info TOPIC: Electrical gremlins. Help!!!!!


Poncho Master!

Status: Offline
Posts: 1283
Date:
Electrical gremlins. Help!!!!!


I am trying to get the 67 2+2 ready to go to the final S & S of the year. It now runs but over the past week it keeps blowing the 10 amp fuse on the guage/back-up light circuit. This has been an intermittent problem.

I have used the accessory spade from this circuit to power the Tach, Oil Pressure Guage and Water Temp Guage.
I have just discovered that at some point while the engine is running the fuse blows. When it is cold it does not blow. When warm it will blow the fuse when only the Temp Guage is attached. When I say warm I mean just barely warm not full operating temp.
Without the temp guage everything else is OK on the circuit.
Has anyone experienced this?
Any ideas as to the repair?
I know I can run without the temp guage or buy and try a new sending unit, or replace all the wiring or!!!!!
Help!!!!

Rick

__________________

1967 Parisienne 2+2
1967 Grande Parisienne

1967 Laurentian
1967 Strato Chief


Remember, "The Government" only has money confiscated from us.

 

 



Canadian Poncho Superstar!

Status: Offline
Posts: 18665
Date:

I almost hate to ask. Is that circuit correctly closed with a 10 amp or should it be a higher rated fuse?

__________________

Ray White, Toronto ON

1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

 






Uber Guru

Status: Offline
Posts: 3543
Date:

you're powering alot with a 10A fuse, try a 20A.

__________________

 








Poncho Master!

Status: Offline
Posts: 1283
Date:

The 10 amp fuse is correct. I just got off the Autometer site and they recommend a separate 1 amp fuse that I don't have. The car only has idiot lights and a fuel guage on the circuit and they appear to be OK when the fuse has not blown.
This is all occurring in the shop without actually driving the car anywhere. I have only been running it to try an eliminate exhaust leaks and now electrical.
When I used my last 10 amp fuse, I tried a 30 amp and it immediately blew.

Rick

__________________

1967 Parisienne 2+2
1967 Grande Parisienne

1967 Laurentian
1967 Strato Chief


Remember, "The Government" only has money confiscated from us.

 

 



Canadian Poncho Superstar!

Status: Offline
Posts: 18665
Date:

67rag396 wrote:

When I used my last 10 amp fuse, I tried a 30 amp and it immediately blew.

Rick



Then doesn't that mean it is shorting? You'll have to trace the wires or pull new I think.



__________________

Ray White, Toronto ON

1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

 






Poncho Master!

Status: Offline
Posts: 2525
Date:

On both of my cars it has been a wire that was touching metal. Start at the back up lights and go forward.

__________________


A Poncho Legend!

Status: Offline
Posts: 41173
Date:

You could try unplugging the harness connector under the drivers left foot area where it sends the backup light power to the back. That would narrow down if it's in the back part or up front somewhere.

By chance does it blow only when you are putting it into reverse in the shop? (Dumb question, I know, but gotta ask the obvious)

__________________

1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles



Poncho Master!

Status: Offline
Posts: 1283
Date:

Backup harness not connected at all.
No problem when engine is cold.
Only a problem after several minutes of engine running and starting to warm up.
If it was a wiring short I would expect it to always blow.
Does it make any sense that it would be a sender problem which is only triggered above some specific temperature?
I am now thinking that I find a new sender tomorrow.
Then replace the sender and test.
If that does not solve the problem I will tear out the wiring, buld a new harness and re-try.


Thanks for letting me think with some helpfull hints.

I hate intermittent electrical issues, they always take way too long to solve.

Rick

__________________

1967 Parisienne 2+2
1967 Grande Parisienne

1967 Laurentian
1967 Strato Chief


Remember, "The Government" only has money confiscated from us.

 

 



A Poncho Legend!

Status: Offline
Posts: 41173
Date:

Is this a factory temp gauge?

If so, if you take off the wire at the sender and ground it, that does the same thing as making the gauge show max heat if I am correct. Will it blow the fuse instantly if you do that?


__________________

1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles



Poncho Master!

Status: Offline
Posts: 1283
Date:

Carl,
This is an aftermarket Autometer Guage. The car only had idiot lights originally.

Rick

__________________

1967 Parisienne 2+2
1967 Grande Parisienne

1967 Laurentian
1967 Strato Chief


Remember, "The Government" only has money confiscated from us.

 

 



A Poncho Legend!

Status: Offline
Posts: 41173
Date:

Sorry, I don't know the wiring on that one. I looked at their website, and it sounds pretty basic to wire it in.

What you say sure makes sense that as soon as the sender starts to allow current it blows the fuse. I am assuming that the gauge is powered and the sender provides the ground.

__________________

1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles



Poncho Master!

Status: Offline
Posts: 1283
Date:

I think before work tomorrow I will try disconnecting at the sender end and test touching the block before warming the engine and see what that does.
I have never heard anyone complain about a sender before so I am thinking it is my wiring that is the problem. The flip side is that it only seems to happen when the guage should be starting to move.
New wiring harness is lots of time, sending unit not as much time or aggravation but more money. Time and money will solve most of these things.

Rick

__________________

1967 Parisienne 2+2
1967 Grande Parisienne

1967 Laurentian
1967 Strato Chief


Remember, "The Government" only has money confiscated from us.

 

 



A Poncho Legend!

Status: Offline
Posts: 41173
Date:

If that blows the fuse, what if you would unhook the sender wire at the gauge and temporarily run a jumper wire from the sender to gauge and try again? That would eliminate that wire. The other side shouldn't be the problem (power wire) because if it was shorted, it should blow the fuse all the time, right?

__________________

1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles



Poncho Master!

Status: Offline
Posts: 1283
Date:

The wiring checked out OK so I replaced the sender on one end and the guage on the other. Everything seems to work again.
In order to remove the sender fron the engine without making a mess it necessary to drain the block. I didn't.

Thanks for the helpfull hints.

Rick

__________________

1967 Parisienne 2+2
1967 Grande Parisienne

1967 Laurentian
1967 Strato Chief


Remember, "The Government" only has money confiscated from us.

 

 



Canadian Poncho Superstar!

Status: Offline
Posts: 18665
Date:

Recently change my temp sender too. I let 65 Camino do it, he was real fast barely spilled a drop! teamwork.gif

__________________

Ray White, Toronto ON

1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

 






Poncho Master!

Status: Offline
Posts: 1283
Date:

Also FYI the new sender has metric nuts argh!!!!!!. I have now stumbled on a few aftermarket items that come with metric nuts.

Rick

__________________

1967 Parisienne 2+2
1967 Grande Parisienne

1967 Laurentian
1967 Strato Chief


Remember, "The Government" only has money confiscated from us.

 

 

Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.

Tweet this page Post to Digg Post to Del.icio.us
.
Support Canadian Poncho!
Select Amount:
<
.
.
.