1990 Jeep Cherokee NO START
02-24-2012 | 09:35 PM
#46
Thread Starter
Newbie
Joined: Feb 2012
Posts: 20
Likes: 0
Model: Cherokee
I have a voltage meter which ive used to check the integrity of the outlets in my home. I just have no idea how to use it on a car engine. Like I said, I am a total n00b. Once again I appreciate all the help. I think I might have to pay someone to do this for me.
02-24-2012 | 11:28 PM
#47
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 19
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
I sort of guessed you might not want to do a pump swap. It's probably not that hard to actually, really get blown up and burned. If you have been shocked by 12 Volt, you might still have sparks in your fingers! KIDDING! 
Yours might be different, but; The black lead is plugged in "COM". The red in "V".
The DC voltage scale (you want), might just have a "V", then a straight minus sign (--). (the AC has the wiggly "~" sign, after the V) Us 90 and earlier Renix Jeep people can use that AC scale to test a CPS, but you are just looking for plain old DC. The little pamphlet that came with it would make that clear. Anyway, the flat, straight line is for DC.
The 20 scale, (up to 20 Volts DC) is the scale you would use. (in the section with a V--) You can start by checking your battery, (red Pos. on +, black neg. on --)
Resting it might be around 12.5, running it might be closer to 14. (Oh! don't worry about the running part now!) So that's it! You are a practicing electrical teck.
Now if you put, (or leave) the black lead on ground, (Neg, "-"), you can use the red to check for power anywhere, like the rear if the resistor there. If you don't have power there, a new pump won't help. The front might have about 12, then maybe around 9 goes to the pump.
Also it couldn't hurt to simply LOOK at the wiring up to the pump. Could have been savaged by Gerbils or something!
Yours might be different, but; The black lead is plugged in "COM". The red in "V".
The DC voltage scale (you want), might just have a "V", then a straight minus sign (--). (the AC has the wiggly "~" sign, after the V) Us 90 and earlier Renix Jeep people can use that AC scale to test a CPS, but you are just looking for plain old DC. The little pamphlet that came with it would make that clear. Anyway, the flat, straight line is for DC.
The 20 scale, (up to 20 Volts DC) is the scale you would use. (in the section with a V--) You can start by checking your battery, (red Pos. on +, black neg. on --)
Resting it might be around 12.5, running it might be closer to 14. (Oh! don't worry about the running part now!) So that's it! You are a practicing electrical teck.
Now if you put, (or leave) the black lead on ground, (Neg, "-"), you can use the red to check for power anywhere, like the rear if the resistor there. If you don't have power there, a new pump won't help. The front might have about 12, then maybe around 9 goes to the pump.
Also it couldn't hurt to simply LOOK at the wiring up to the pump. Could have been savaged by Gerbils or something!
02-25-2012 | 01:14 AM
#48
Senior Member
Joined: Aug 2010
Posts: 692
Likes: 1
From: Tempe, AZ
Year: 1990
Model: Cherokee
Engine: l6 242
Originally Posted by DFlintstone
I sort of guessed you might not want to do a pump swap. It's probably not that hard to actually, really get blown up and burned. If you have been shocked by 12 Volt, you might still have sparks in your fingers! KIDDING!
Yours might be different, but; The black lead is plugged in "COM". The red in "V".
The DC voltage scale (you want), might just have a "V", then a straight minus sign (--). (the AC has the wiggly "~" sign, after the V) Us 90 and earlier Renix Jeep people can use that AC scale to test a CPS, but you are just looking for plain old DC. The little pamphlet that came with it would make that clear. Anyway, the flat, straight line is for DC.
The 20 scale, (up to 20 Volts DC) is the scale you would use. (in the section with a V--) You can start by checking your battery, (red Pos. on +, black neg. on --)
Resting it might be around 12.5, running it might be closer to 14. (Oh! don't worry about the running part now!) So that's it! You are a practicing electrical teck.
Now if you put, (or leave) the black lead on ground, (Neg, "-"), you can use the red to check for power anywhere, like the rear if the resistor there. If you don't have power there, a new pump won't help. The front might have about 12, then maybe around 9 goes to the pump.
Also it couldn't hurt to simply LOOK at the wiring up to the pump. Could have been savaged by Gerbils or something!
Yours might be different, but; The black lead is plugged in "COM". The red in "V".
The DC voltage scale (you want), might just have a "V", then a straight minus sign (--). (the AC has the wiggly "~" sign, after the V) Us 90 and earlier Renix Jeep people can use that AC scale to test a CPS, but you are just looking for plain old DC. The little pamphlet that came with it would make that clear. Anyway, the flat, straight line is for DC.
The 20 scale, (up to 20 Volts DC) is the scale you would use. (in the section with a V--) You can start by checking your battery, (red Pos. on +, black neg. on --)
Resting it might be around 12.5, running it might be closer to 14. (Oh! don't worry about the running part now!) So that's it! You are a practicing electrical teck.
Now if you put, (or leave) the black lead on ground, (Neg, "-"), you can use the red to check for power anywhere, like the rear if the resistor there. If you don't have power there, a new pump won't help. The front might have about 12, then maybe around 9 goes to the pump.
Also it couldn't hurt to simply LOOK at the wiring up to the pump. Could have been savaged by Gerbils or something!
02-25-2012 | 01:36 AM
#50
Senior Member
Joined: Mar 2010
Posts: 812
Likes: 1
From: Eugene, OR
Year: 1989
Model: Cherokee
Engine: 4.7 Stroker I6
its times like this Im glad I have the mindset I can do anything whether I know it or not lol. I just tear into things and everything's always came out ok, with or without a little help sometimes.
as said above more clearly than I stated, check for voltage at the connector near the tank for the fuel pump before you pay a mechanic to also diagnose things. If you go in acting like you know what your talking about, tell them what youve tested and say what you want done it will save time and money.
as said above more clearly than I stated, check for voltage at the connector near the tank for the fuel pump before you pay a mechanic to also diagnose things. If you go in acting like you know what your talking about, tell them what youve tested and say what you want done it will save time and money.
02-25-2012 | 02:56 AM
#51
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 19
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
X2^ I was thinking along the same lines. Learn a few things, then hopefully know exactly what you need. And heck, maybe find someone with a brass drift, that knows how to use it!
02-25-2012 | 04:30 AM
#52
Thread Starter
Newbie
Joined: Feb 2012
Posts: 20
Likes: 0
Model: Cherokee
I sort of guessed you might not want to do a pump swap. It's probably not that hard to actually, really get blown up and burned. If you have been shocked by 12 Volt, you might still have sparks in your fingers! KIDDING!
Yours might be different, but; The black lead is plugged in "COM". The red in "V".
The DC voltage scale (you want), might just have a "V", then a straight minus sign (--). (the AC has the wiggly "~" sign, after the V) Us 90 and earlier Renix Jeep people can use that AC scale to test a CPS, but you are just looking for plain old DC. The little pamphlet that came with it would make that clear. Anyway, the flat, straight line is for DC.
The 20 scale, (up to 20 Volts DC) is the scale you would use. (in the section with a V--) You can start by checking your battery, (red Pos. on +, black neg. on --)
Resting it might be around 12.5, running it might be closer to 14. (Oh! don't worry about the running part now!) So that's it! You are a practicing electrical teck.
Now if you put, (or leave) the black lead on ground, (Neg, "-"
, you can use the red to check for power anywhere, like the rear if the resistor there. If you don't have power there, a new pump won't help. The front might have about 12, then maybe around 9 goes to the pump.
Also it couldn't hurt to simply LOOK at the wiring up to the pump. Could have been savaged by Gerbils or something!
Yours might be different, but; The black lead is plugged in "COM". The red in "V".
The DC voltage scale (you want), might just have a "V", then a straight minus sign (--). (the AC has the wiggly "~" sign, after the V) Us 90 and earlier Renix Jeep people can use that AC scale to test a CPS, but you are just looking for plain old DC. The little pamphlet that came with it would make that clear. Anyway, the flat, straight line is for DC.
The 20 scale, (up to 20 Volts DC) is the scale you would use. (in the section with a V--) You can start by checking your battery, (red Pos. on +, black neg. on --)
Resting it might be around 12.5, running it might be closer to 14. (Oh! don't worry about the running part now!) So that's it! You are a practicing electrical teck.
Now if you put, (or leave) the black lead on ground, (Neg, "-"
, you can use the red to check for power anywhere, like the rear if the resistor there. If you don't have power there, a new pump won't help. The front might have about 12, then maybe around 9 goes to the pump.Also it couldn't hurt to simply LOOK at the wiring up to the pump. Could have been savaged by Gerbils or something!
02-25-2012 | 04:58 AM
#54
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 31
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
jumping fuel pump relay after confirming 12volts are present at relay either terminal 30 or 87 in plug do not keep jumper on very long a few secongs listen at tank for pump running
Last edited by freegdr; 02-25-2012 at 05:01 AM.
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