viper 5901 where is tach jumper?

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Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=122979
Printed Date: July 14, 2025 at 9:25 AM

Topic: viper 5901 where is tach jumper?

Posted By: ozofoe
Subject: viper 5901 where is tach jumper?
Date Posted: August 05, 2010 at 9:54 AM

The uncommon wire at the coil is reading .3v so I'm trying to lower the tach voltage threshold like the directions suggest. It tells me to move the jumper from the default position to the other side.

Where is the tach jumper? The only jumpers on the outside are to tell the 5901 that you have docked a bypass in the bay. They jumper horizontal if using an external bypass, and horizontal if a bypass is docked. Under the cover is the light flash polarity fuse to be jumped, but that's not it. Can't find any other jumpers!

Replies:

Posted By: Mark Mizenko
Date Posted: August 05, 2010 at 10:34 AM

Nextto the Bitwriter port?

Posted By: howie ll
Date Posted: August 05, 2010 at 2:45 PM

3vAC is perfectly OK

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Posted By: howie ll
Date Posted: August 05, 2010 at 2:47 PM

And I think what you're looking for is in the programming rather than change anything physically.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Posted By: tedmond
Date Posted: August 05, 2010 at 9:24 PM

its programming for sure. No need to lower tach threshold. Low tach is < 1.3 volts anything thing above and the unit should detect.

Go through tach programming again

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Ted
2nd Year Tier 1 Medical School
Still installing as a hobby...pays for groceries
Compustar Expert