Can The Negative Cable For The Invisibrake Be Attached To Chassis Ground Instead Of The Battery
Updated 08/01/2025 | Published 06/28/2023
Question:
Invisibrake 8700 Roadmaster installed on 2023 Chevy Silverado. Power Wire page 12 of manual says, connect to battery, or black can be grounded to chassis. But then it says, If battery is disconnected, cables must be connected to the battery. On the Chevy, only the negative is disconnected. So can the black wire from the Roadmaster be grounded to the chassis or do I need to disconnect the negative, but then reconnect only the black wire from the roadmaster to the negative battery terminal?
asked by: Michael J
Expert Reply:
When you disconnect the battery it's to prevent systems inside the vehicle from activating. The Roadmaster InvisiBrake Supplemental Braking System # RM-8700 will still need to be wired directly to the battery for power. The only time you should use chassis ground is if the negative battery terminal can not accept aftermarket accessories. You'll disconnect the negative battery cable like your vehicle's manual states but leave the Invisibrake cable attached to the terminal.
Product Page this Question was Asked From
Roadmaster InvisiBrake Flat Tow Brake System - Preset
- Flat Tow Brake System
- Brake Systems
- Pre-Set System
- One-Time Setup
- Vehicle Battery
- Fixed System
- Power Assist Brake Compatible
- Air Brakes
- Hydraulic Brakes
- Indicator Lights
- Roadmaster
more information >
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on Flat Tow Brake System
Jim A.
7/26/2025
How about the white wire of the four wire harness attached to the Invisbrake that goes up to the RV 7 wire plug and back to the tail lights. Can that be grounded to chassis per the install diagram? Will it back feed through the Invisbrake back to the battery post? Is it doing anything when attached to the chassis when the the battery ground is disconnected? CAUTION Failure to establish good ground connections WILL CAUSE non-warranty electrical damage to InvisiBrake. Other consequential non-warranty damage may also occur. A good ground connection MUST EXIST… • …between the towed vehicle and motorhome; ""• …between InvisiBrake and the towed vehicle and"" • …between InvisiBrake and the motorhome. If the towed vehicle has been wired for towing, check to make certain a good ground exists between the towed vehicle and the motorhome; refer to the illustrations below and to the complete wiring schematic near the beginning of these instructions for InvisiBrake ground wire connections.