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  #1 (permalink)  
Old 05 Sep 2009, 09:38 pm
leftoverture's Avatar
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Location: Lester Prairie, MN
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Default Cruiser Question

My son and I did the front brakes on our 01 Cruiser today. We noticed on each side, there is a wire that seems to go from the inner fender to to the strut. On the inner fender it appears to connect to a round grommet like thing. The other end seems to ground on the strut mounting bracket or something. On both sides this wire had been cut (some time ago judging by the corroded ends of the wire). Anyone know what these wires are?
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  #2 (permalink)  
Old 05 Sep 2009, 09:44 pm
quicksilverdon's Avatar
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Location: Felton, Delaware
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Default Re: Cruiser Question

Body ground wires.
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  #3 (permalink)  
Old 06 Sep 2009, 06:29 am
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Posts: 27,744
Default Re: Cruiser Question

Answer from our local PT Guru (MX-5) quoting the service manual:

Factory-installed radio noise suppression is accomplished
primarily through circuitry or devices that
are integral to the factory-installed radios, audio
power amplifiers and other on-board electrical components
such as generators, wiper motors, blower
motors, and fuel pumps that have been found to be
potential sources of RFI or EMI. External radio noise
suppression devices that are used on this vehicle to
control RFI or EMI, and can be serviced, include the
following:

Ground straps - This length of braided ground
strap has an eyelet terminal connector crimped to
each end. They are located in various locations on
the vehicle.

Radio Noise Suppression Capacitor - This
component is attached to the throttle control support
bracket.

Resistor-type spark plugs - This type of spark
plug has an internal resistor connected in series
between the spark plug terminal and the center electrode
to help reduce the production of electromagnetic
radiation that can result in radio noise.
OPERATION
There are two common strategies that can be used
to suppress Radio Frequency Interference (RFI) and
ElectroMagnetic Interference (EMI) radio noise. The
first suppression strategy involves preventing the
production of RFI and EMI electromagnetic signals
at their sources. The second suppression strategy
involves preventing the reception of RFI and EMI
electromagnetic signals by the audio system components.
The use of braided ground straps in key locations
is part of the RFI and EMI prevention strategy.
These ground straps ensure adequate ground paths,
particularly for high current components such as
many of those found in the starting, charging, ignition,
engine control and transmission control systems.
An insufficient ground path for any of these
high current components may result in radio noise
caused by induced voltages created as the high current
seeks alternative ground paths through components
or circuits intended for use by, or in close
proximity to the audio system components or circuits.
Preventing the reception of RFI and EMI is accomplished
by ensuring that the audio system components
are correctly installed in the vehicle. Loose,
corroded or improperly soldered wire harness connections,
improperly routed wiring and inadequate audio
system component grounding can all contribute to
the reception of RFI and EMI. A properly grounded
antenna body and radio chassis, as well as a shielded
antenna coaxial cable with clean and tight connections
will each help reduce the potential for reception
of RFI and EMI.

ENGINE GROUND STRAP
(1) Install strap and bolt to strut tower. Tighten
bolt to 12 N·m (105 in. lbs.).
(2) Install strap and bolt to engine cylinder head.
Tighten bolt to 28 N·m (21 ft. lbs.).
(3) Connect battery negative cable.

HOOD HINGE GROUND STRAP
(1) Install strap and bolt to fender. Tighten bolt to
4 N·m (35 in. lbs.).
(2) Install strap and bolt to hood. Tighten bolt to 4
N·m (35 in. lbs.).
(3) Connect battery negative cable.

MUFFLER GROUND STRAP
(1) Install strap and bolt to rear floor pan. Tighten
bolt to 8 N·m (75 in. lbs.).
(2) Install strap and bolt to muffler. Tighten bolt to
8 N·m (75 in. lbs.).
(3)

RADIO NOISE SUPPRESSION CAPACITOR
(1) Install capacitor and bolt.
(2) Connect electrical harness connector to capacitor.
(3) Connect battery negative cable.

STRUT BRACKET TO BODY GROUND STRAP
(1) Install strap to frame rail.
(2) Install strap and bolt to strut. Tighten bolt to
12 N·m (105 in. lbs.).
(3) Connect battery negative cable.
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Old 06 Sep 2009, 06:57 am
leftoverture's Avatar
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Default Re: Cruiser Question

Very interesting responses, thanks. Now my next question is. . .if they are ground straps why would someone have cut them? (We have the factory radio with no noise issues)
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Old 06 Sep 2009, 07:35 am
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Posts: 27,744
Default Re: Cruiser Question

From PT Do-It-Yourself.net:

The use of braided ground straps in key locations is part of the RFI and EMI prevention strategy on the PT. These ground straps ensure adequate ground paths, particularly for high current components such as many of those found in the starting, charging, ignition, engine control and transmission control systems. One end of the engine ground strap is bolted to the engine cylinder head. The other end attaches to a bolt on the top of the strut tower. As a precaution disconnect the negative lead on the battery before re-connecting the ground strap.

Why cut them? They probably got in the way of someone doing some sort of maintenance and it was easier to cut them off rather than disconnect them and put them back on.

END of my responses. Headed to D.C. with the Grandkids to see the sites.
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Last edited by CREWZIN; 06 Sep 2009 at 07:38 am.
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  #6 (permalink)  
Old 06 Sep 2009, 08:34 am
ejstith's Avatar
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Location: Tallahassee, FL
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Default Re: Cruiser Question

Quote:
Originally Posted by CREWZIN View Post
From PT Do-It-Yourself.net:

END of my responses. Headed to D.C. with the Grandkids to see the sites.
Stay a week and you can do the 9-12 thingy .. whoo hooo
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Old 06 Sep 2009, 12:30 pm
leftoverture's Avatar
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Default Re: Cruiser Question

Quote:
Originally Posted by CREWZIN View Post
END of my responses. Headed to D.C. with the Grandkids to see the sites.
Crewzin - have a great trip. Sounds like fun. Thanks for your help!
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