BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 Bizarre roadmaster electrical issue

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Ironfistdog



Posts : 2124
Join date : 2011-01-11
Age : 35
Location : Warren, MA

PostSubject: Bizarre roadmaster electrical issue   Sat Nov 17, 2012 6:21 pm

So I've been having this issue with the wagon for like 3 weeks now. I THOUGHT I knew what it was but I replaced that and it's still doing it,

Here's the symptom:
While driving every so often mostly over bumps the speedo needle bounces/ jumps, the ABS-low gas-check engine-oil or any combination of warning lights flash and the radio makes a "thump" through the speakers.

What I thought it was:

Power distribution box inside engine compartment was held together with duct tape and the main 8 gauge power wire was wrapped up like a mummy in electrical tape.

When I took it apart I replaced the stud AND the metal holders for the main body fuses. I did notice the other two wires coming off the side looked a little burned, but I assume it's from the stud arcing.
I filed and wire brushed all connections. So maybe it wasn't this? Maybe the burned wires need new crimps?
Am I barking up the wrong tree?

Does it sound like a ground problem?

Also noticed since installing the electronic flasher that the speedo needle ticks a little with the flashing... Related or just something that happens?
Oh and when the main "problem" happens at night with headlights on I notice some slight dimming on and off with the headlights.

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toomanytoyz
Club President


Posts : 6870
Join date : 2009-01-20
Age : 40
Location : East Hampstead, NH USA

PostSubject: Re: Bizarre roadmaster electrical issue   Sat Nov 17, 2012 7:29 pm

You have bad ground(s) somewhere.

_________________
Bill "The Verb" Crovo - Resident Car Slut & Unicorn Hunter

A Toasted Marshmallow, A Long German, A Lame Suburban and expensive dreams...
Missing all my previous B's, D's and V... Sad
American Ricer
www.badassofne.net
"Ooooh! Look! Something shiny!"
NO MORE UNICORNS!!!!!

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Ironfistdog



Posts : 2124
Join date : 2011-01-11
Age : 35
Location : Warren, MA

PostSubject: Re: Bizarre roadmaster electrical issue   Sat Nov 17, 2012 7:50 pm

Any particular one I should start start on? Coil? Head ground strap? Or aomthing specific on that circuit?

I did notice the aftermarket radio ground wire was a little loose in the harness (cd player side) you think that could cause mayhem in the whole car? Or it's just a coincidence?
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GasTT



Posts : 2675
Join date : 2009-01-19
Age : 28
Location : Treasure Coast, FL

PostSubject: Re: Bizarre roadmaster electrical issue   Sat Nov 17, 2012 10:59 pm

Take a look at some ground distribution charts to try and track it down.
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Ironfistdog



Posts : 2124
Join date : 2011-01-11
Age : 35
Location : Warren, MA

PostSubject: Re: Bizarre roadmaster electrical issue   Sat Nov 17, 2012 11:06 pm

I actually just talked the original owner of the car (and I mean the guy I bought it from bought it new so ORIGINAL!)
and he said that distribution block was causing the lights to flicker and the car would also just die.
But I'm still for the ground idea. I know I've done a ton to modify the car, but by him saying he had the problem too shows it's nothing I did directly to cause the problem. I'm planning to go forward with the FWB front clip like I originally wanted once I start cutting up the black car. When I do that I plan to replace the entire engine harness with the one from the dggm car. but for now I'll do some snooping in the usual places.
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silverfox103



Posts : 1475
Join date : 2009-01-25
Age : 21
Location : Littleton, NH & St. Simons Island, GA

PostSubject: Re: Bizarre roadmaster electrical issue   Sun Nov 18, 2012 7:35 am

Auxiliary Battery Post
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toomanytoyz
Club President


Posts : 6870
Join date : 2009-01-20
Age : 40
Location : East Hampstead, NH USA

PostSubject: Re: Bizarre roadmaster electrical issue   Sun Nov 18, 2012 8:24 am

silverfox103 wrote:
Auxiliary Battery Post

He said he already replaced that though. I thought the same thing at first.

_________________
Bill "The Verb" Crovo - Resident Car Slut & Unicorn Hunter

A Toasted Marshmallow, A Long German, A Lame Suburban and expensive dreams...
Missing all my previous B's, D's and V... Sad
American Ricer
www.badassofne.net
"Ooooh! Look! Something shiny!"
NO MORE UNICORNS!!!!!

LOWER IT!!! Wink
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http://impalass.uniquekind.net/
Ironfistdog



Posts : 2124
Join date : 2011-01-11
Age : 35
Location : Warren, MA

PostSubject: Re: Bizarre roadmaster electrical issue   Sun Nov 18, 2012 9:37 am

Yeah but there were 2 wires coming off the side that were green with corrosion and looked severly burned, I only wire brushed them. There could be damage to the wires that I didn't see. It's very tight there. I'm gonna cut the wires Today and replace the connectors.
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GasTT



Posts : 2675
Join date : 2009-01-19
Age : 28
Location : Treasure Coast, FL

PostSubject: Re: Bizarre roadmaster electrical issue   Sun Nov 18, 2012 1:17 pm

Good call Tom. Make sure the nut is tight on that aux post. The nut on my Caprice was loose and it kept going dead while driving down the street. Drove me absolutely crazy one night. I even had it towed and put a new battery in it for nothing.
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Ironfistdog



Posts : 2124
Join date : 2011-01-11
Age : 35
Location : Warren, MA

PostSubject: Re: Bizarre roadmaster electrical issue   Sun Nov 18, 2012 3:40 pm

No definitely NOT that auxiliary post that was what I did before writing out the thread. I replaced everything there.

Just replaced a broken head to firewall groud strap and also found the fender to battery ground had melted the coolant bucket and was loose.
So far no issues, so I'm pretty sure the ground was the issue.

Thank you Bill, Tom, and Tim for the ideas/help!
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Cadet57



Posts : 4476
Join date : 2010-03-14
Age : 29
Location : Chicopee, MA

PostSubject: Re: Bizarre roadmaster electrical issue   Sun Nov 18, 2012 4:52 pm

Do the LT1's have a T-stat ground like the TBI's?
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Ironfistdog



Posts : 2124
Join date : 2011-01-11
Age : 35
Location : Warren, MA

PostSubject: Re: Bizarre roadmaster electrical issue   Sun Nov 18, 2012 4:57 pm

No, they are all on the coil bolt I beleve.
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95brmw



Posts : 1431
Join date : 2009-11-10
Age : 32
Location : Connecticut

PostSubject: Re: Bizarre roadmaster electrical issue   Sun Nov 18, 2012 5:51 pm

Sounds like you found it, but if you run into it again check the grounds inside the car. There's a ground point behind the kick panels on both sides of the car, might need to pull the sill plate off to see them.
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silverfox103



Posts : 1475
Join date : 2009-01-25
Age : 21
Location : Littleton, NH & St. Simons Island, GA

PostSubject: Re: Bizarre roadmaster electrical issue   Sun Nov 18, 2012 6:58 pm

Missed that you replaced the auxiliary post, I've had grounds cause strange problems. Glad you figured it out.

Tom
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Matt Trakker



Posts : 5075
Join date : 2009-07-30
Age : 35
Location : Reading, MA

PostSubject: Re: Bizarre roadmaster electrical issue   Sun Nov 18, 2012 7:32 pm

This thread makes me realize I have a LOT to learn about the LT1 cars coming from the TBI ones...lol.

Glad you found it, I'll wait until I have the other stuff sorted out but I think I'll remove/clean all the grounds on the SS (carefully) when I get a chance... Smile
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