hooked up tach to factory plug and doesnt work?

gotacummins · 11-15-2009, 08:18 PM

I hooked up the Isspro tach to my factory tach plug and it doesnt work? the light on the tach works but thats it, i double checked the wiring??? The CPS is brand new and it works?? how should i check the cps signal? I think I got a bad tach

__________________
"If JESUS bore the cross and died on it for me, ought I not to be willing to take it up for Him?" 93 D250 club cab AT HE351CW, 4" DP and custom exhaust ,cooler tubz, Denny T pin, 3200k spring, BLK H2's

Last edited by gotacummins : 11-15-2009 at 08:22 PM.

wjones · 11-17-2009, 11:38 AM

did you grab the grey wire for the tach feed and is your tach programmable?

__________________
1992 W250, Getrag Club Cab

gotacummins · 11-17-2009, 01:18 PM

yes I used the gray for signal and its the 8503 4k isspro. How would I check the cps signal with a voltmeter?

__________________
"If JESUS bore the cross and died on it for me, ought I not to be willing to take it up for Him?" 93 D250 club cab AT HE351CW, 4" DP and custom exhaust ,cooler tubz, Denny T pin, 3200k spring, BLK H2's

wjones · 11-18-2009, 02:01 PM

Test that grey wire against the ground. Probably have more luck with an oscilloscope if you have one laying around.

are you using the isspro harness with the resistor?

mine will make a pattern with the oscilloscope, and my multimeter will show pluses; however my gauge wont work. i assume theres something wrong with the control module and its not pulsing high enough for the gauge to pick it up. gauge works fine with their magnet pickup kit.

__________________
1992 W250, Getrag Club Cab

921stgen · 11-18-2009, 05:08 PM

Did you wire it correctly?
Dodge Diesel - Diesel Truck Resource Forums - View Single Post - Questions about hooking up a Isspro tach

__________________
91.5 W250 rusty p.o.s., pods, no afc, pull cable, AM electric FP gauge, Isspro boost, pyro, 366, 91 W350 parts truck, (SOLD) 92 W250,
OHIO Coal Rollers

dodge350c · 11-19-2009, 10:32 PM

where is the factory plug if every truck came with them

Philip · 11-19-2009, 11:01 PM

Not every 1st gen has the tach plug. Later 92 and 93's did, nothing before then.

__________________
93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, Super HX40/16, auto(G56 soon), 3:07's axles, 2" skyjacker lift, B&W flatbed

dodge350c · 11-23-2009, 12:20 AM

ok i have a 93 if i got how and where would i hook it up and can i use a gas tach or does it have to be a diesel only tach. thanks

wjones · 11-23-2009, 03:02 AM

theres a four pin harness taped under the dash on the left side of the steering wheel. nope gas tach wont work. afaik only isspros work.

__________________
1992 W250, Getrag Club Cab

dodge350c · 11-23-2009, 11:52 PM

oh ok are the isspros tach's expensive

dodge350c · 11-24-2009, 12:04 AM

i found the harness for the 92 dodge but does it tell you how to hook it up and where the wire's go

Last edited by dodge350c : 11-24-2009 at 12:11 AM. Reason: wrong responce

wjones · 11-24-2009, 03:26 AM

their 'harness' is a heat shrunk bundle of wires with spade terminals on one end and butt connectors on the other; save $50 or whatever isspro charges and the diagram is in 921stgen's link above.

__________________
1992 W250, Getrag Club Cab

Last edited by wjones : 11-24-2009 at 03:38 AM.

11-15-2009, 08:18 PM	#1 (permalink)
gotacummins Diesel Freak Join Date: May 2008 Posts: 603 Thanks: 19 Thanked 6 Times in 5 Posts gotacummins's Truck Pics	hooked up tach to factory plug and doesnt work? I hooked up the Isspro tach to my factory tach plug and it doesnt work? the light on the tach works but thats it, i double checked the wiring??? The CPS is brand new and it works?? how should i check the cps signal? I think I got a bad tach __________________ "If JESUS bore the cross and died on it for me, ought I not to be willing to take it up for Him?" 93 D250 club cab AT HE351CW, 4" DP and custom exhaust ,cooler tubz, Denny T pin, 3200k spring, BLK H2's Last edited by gotacummins : 11-15-2009 at 08:22 PM.

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11-17-2009, 11:38 AM	#2 (permalink)
wjones Cummins Nut Join Date: Apr 2008 Location: Southern California Posts: 303 Thanks: 0 Thanked 5 Times in 5 Posts wjones's Truck Pics	did you grab the grey wire for the tach feed and is your tach programmable? __________________ 1992 W250, Getrag Club Cab

11-17-2009, 01:18 PM	#3 (permalink)
gotacummins Diesel Freak Join Date: May 2008 Posts: 603 Thanks: 19 Thanked 6 Times in 5 Posts gotacummins's Truck Pics	yes I used the gray for signal and its the 8503 4k isspro. How would I check the cps signal with a voltmeter? __________________ "If JESUS bore the cross and died on it for me, ought I not to be willing to take it up for Him?" 93 D250 club cab AT HE351CW, 4" DP and custom exhaust ,cooler tubz, Denny T pin, 3200k spring, BLK H2's

11-18-2009, 02:01 PM	#4 (permalink)
wjones Cummins Nut Join Date: Apr 2008 Location: Southern California Posts: 303 Thanks: 0 Thanked 5 Times in 5 Posts wjones's Truck Pics	Test that grey wire against the ground. Probably have more luck with an oscilloscope if you have one laying around. are you using the isspro harness with the resistor? mine will make a pattern with the oscilloscope, and my multimeter will show pluses; however my gauge wont work. i assume theres something wrong with the control module and its not pulsing high enough for the gauge to pick it up. gauge works fine with their magnet pickup kit. __________________ 1992 W250, Getrag Club Cab

11-18-2009, 05:08 PM	#5 (permalink)
921stgen Cummins Enthusiast Join Date: Jan 2008 Location: Springfield, Ohio Posts: 214 Thanks: 0 Thanked 3 Times in 3 Posts 921stgen's Truck Pics	Did you wire it correctly? Dodge Diesel - Diesel Truck Resource Forums - View Single Post - Questions about hooking up a Isspro tach __________________ 91.5 W250 rusty p.o.s., pods, no afc, pull cable, AM electric FP gauge, Isspro boost, pyro, 366, 91 W350 parts truck, (SOLD) 92 W250, *OHIO* *Coal Rollers*

11-19-2009, 10:32 PM	#6 (permalink)
dodge350c Cummins Fan Join Date: Nov 2009 Posts: 46 Thanks: 0 Thanked 0 Times in 0 Posts dodge350c's Truck Pics	where is the factory plug if every truck came with them

11-19-2009, 11:01 PM	#7 (permalink)
Philip 1ST GEN MODERATOR Join Date: Nov 2007 Location: Indiana Posts: 6,249 Thanks: 5 Thanked 244 Times in 223 Posts Philip's Truck Pics	Not every 1st gen has the tach plug. Later 92 and 93's did, nothing before then. __________________ 93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, Super HX40/16, auto(G56 soon), 3:07's axles, 2" skyjacker lift, B&W flatbed

11-23-2009, 12:20 AM	#8 (permalink)
dodge350c Cummins Fan Join Date: Nov 2009 Posts: 46 Thanks: 0 Thanked 0 Times in 0 Posts dodge350c's Truck Pics	ok i have a 93 if i got how and where would i hook it up and can i use a gas tach or does it have to be a diesel only tach. thanks

11-23-2009, 03:02 AM	#9 (permalink)
wjones Cummins Nut Join Date: Apr 2008 Location: Southern California Posts: 303 Thanks: 0 Thanked 5 Times in 5 Posts wjones's Truck Pics	theres a four pin harness taped under the dash on the left side of the steering wheel. nope gas tach wont work. afaik only isspros work. __________________ 1992 W250, Getrag Club Cab

11-23-2009, 11:52 PM	#10 (permalink)
dodge350c Cummins Fan Join Date: Nov 2009 Posts: 46 Thanks: 0 Thanked 0 Times in 0 Posts dodge350c's Truck Pics	oh ok are the isspros tach's expensive

11-24-2009, 12:04 AM	#11 (permalink)
dodge350c Cummins Fan Join Date: Nov 2009 Posts: 46 Thanks: 0 Thanked 0 Times in 0 Posts dodge350c's Truck Pics	i found the harness for the 92 dodge but does it tell you how to hook it up and where the wire's go Last edited by dodge350c : 11-24-2009 at 12:11 AM. Reason: wrong responce

11-24-2009, 03:26 AM	#12 (permalink)
wjones Cummins Nut Join Date: Apr 2008 Location: Southern California Posts: 303 Thanks: 0 Thanked 5 Times in 5 Posts wjones's Truck Pics	their 'harness' is a heat shrunk bundle of wires with spade terminals on one end and butt connectors on the other; save $50 or whatever isspro charges and the diagram is in 921stgen's link above. __________________ 1992 W250, Getrag Club Cab Last edited by wjones : 11-24-2009 at 03:38 AM.