Changing from Positive Input to Negative Output

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Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=4427
Printed Date: August 09, 2025 at 2:36 PM

Topic: Changing from Positive Input to Negative Output

Posted By: dereck
Subject: Changing from Positive Input to Negative Output
Date Posted: October 13, 2002 at 1:37 PM

Jeff what wires do you install on the relay to change the positive input on the remote starter to negative out put. Were does the glow plug wire hook to from the remote starter, and were does the wait to start wire hook to from the truck? I can see the 87 and 86 is the ground, and the 85 is 12 volt constant power. What is the 30 pin connected to?

Replies:

Posted By: Velocity Motors
Date Posted: October 13, 2002 at 3:12 PM

POSITIVE INPUT ----> NEGATIVE OUTPUT

87 & 86 - CHASSIS ground
30 - Goes to the GLOW PLUG WIRE. The Dodge has a negative output on this wire.
85 - This pin will be connected to the Glow plug wire of the RS unit.
87a - NOT USED

Quick question..... is the GLOW PLUG wire of the RS unit that you have a (-) or a (+) input wire to sense that the glow plug is on and off ? Just want to make sure of this before you venture out into thte truck and do something wrong. = )

You probably need a system that reverses the (-) output of the Dodge to a (+) input for the RS unit right ?? If so this is the wiring diagram that you need:

NEGATIVE INPUT ----> POSITIVE OUTPUT

87 & 86 - 12 volts +
30 - This pin will be connected to the Glow plug wire of the RS unit.
85 - Goes to the GLOW PLUG WIRE. The Dodge has a negative output on this wire.
87a - NOT USED

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: dereck
Date Posted: October 13, 2002 at 3:31 PM

Yes the glow plug wire off the RS is +. So we have to use the second diagram right.

Posted By: Velocity Motors
Date Posted: October 13, 2002 at 5:51 PM

Yes that is correct posted_image

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA