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Testing MSD RPM-Activated Switch #1552661
12/24/13 07:36 PM 12/24/13 07:36 PM
Joined: Feb 2006
Posts: 501
CEDAR RAPIDS
Plymouth340 Offline OP
mopar
Plymouth340  Offline OP
mopar

Joined: Feb 2006
Posts: 501
CEDAR RAPIDS
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?
Re: Testing MSD RPM-Activated Switch [Re: Plymouth340] #1552662
12/24/13 08:26 PM 12/24/13 08:26 PM
Joined: Jan 2007
Posts: 345
iowa
wesw Offline
enthusiast
wesw  Offline
enthusiast

Joined: Jan 2007
Posts: 345
iowa
if you have the MSD 8998 tester you can hook it up and check your complete system out

598 ci predator
Re: Testing MSD RPM-Activated Switch [Re: Plymouth340] #1552663
12/24/13 09:15 PM 12/24/13 09:15 PM
Joined: May 2006
Posts: 739
WA
JD Dart Offline
super stock
JD Dart  Offline
super stock

Joined: May 2006
Posts: 739
WA
Doesn't the rpm switch complete the ground side two grds don't make it hot.

Re: Testing MSD RPM-Activated Switch [Re: JD Dart] #1552664
12/24/13 10:48 PM 12/24/13 10:48 PM
Joined: Feb 2006
Posts: 501
CEDAR RAPIDS
Plymouth340 Offline OP
mopar
Plymouth340  Offline OP
mopar

Joined: Feb 2006
Posts: 501
CEDAR RAPIDS
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.
Re: Testing MSD RPM-Activated Switch [Re: Plymouth340] #1552665
12/25/13 02:31 AM 12/25/13 02:31 AM
Joined: Jun 2004
Posts: 2,360
Mobile Alabama
S
SB412DUSTER Offline
top fuel
SB412DUSTER  Offline
top fuel
S

Joined: Jun 2004
Posts: 2,360
Mobile Alabama
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
Re: Testing MSD RPM-Activated Switch [Re: Plymouth340] #1552666
12/25/13 03:30 AM 12/25/13 03:30 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
You are using a relay to trigger the shifter.. right
the chip will complete the ground to trigger the relay
Re: Testing MSD RPM-Activated Switch [Re: SB412DUSTER] #1552667
12/25/13 12:30 PM 12/25/13 12:30 PM
Joined: Feb 2006
Posts: 501
CEDAR RAPIDS
Plymouth340 Offline OP
mopar
Plymouth340  Offline OP
mopar

Joined: Feb 2006
Posts: 501
CEDAR RAPIDS
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

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