Testing MSD RPM-Activated Switch

Posted By: Plymouth340

Testing MSD RPM-Activated Switch - 12/24/13 11:36 PM

Just got my car running and have a msd 8950 RPM-Activated Switch to shift and put a 3000 chip in it and it doesn't shift. If I put 12 volts to shifter it will shift. Is there anyway to test the msd RPM-Activated Switch? Or time for a new one?

Posted By: wesw

Re: Testing MSD RPM-Activated Switch - 12/25/13 12:26 AM

if you have the MSD 8998 tester you can hook it up and check your complete system out

Attached picture 7970187-8998_fulltester.jpg

Posted By: JD Dart

Re: Testing MSD RPM-Activated Switch - 12/25/13 01:15 AM

Doesn't the rpm switch complete the ground side two grds don't make it hot.

Posted By: Plymouth340

Re: Testing MSD RPM-Activated Switch - 12/25/13 02:48 AM

Quote:

Doesn't the rpm switch complete the ground side two grds don't make it hot.

gray wire witch I don't use does. I use yellow wire witch makes it hot when activated.

Posted By: SB412DUSTER

Re: Testing MSD RPM-Activated Switch - 12/25/13 06:31 AM

Quote:

Quote:

Doesn't the rpm switch complete the ground side two grds don't make it hot.

gray wire witch I don't use does. I use yellow wire witch makes it hot when activated.

Both wires make a ground. not hot

Posted By: MR_P_BODY

Re: Testing MSD RPM-Activated Switch - 12/25/13 07:30 AM

You are using a relay to trigger the shifter.. right
the chip will complete the ground to trigger the relay

Posted By: Plymouth340

Re: Testing MSD RPM-Activated Switch - 12/25/13 04:30 PM

Quote:

Quote:

Quote:

Doesn't the rpm switch complete the ground side two grds don't make it hot.

gray wire witch I don't use does. I use yellow wire witch makes it hot when activated.

Both wires make a ground. not hot

Thanks I will recheck the wiring. maybe I have wrong solenoid for shifter. just put in a different style one and always used yellow wire from rpm switch to solenoid.thanks