Fuel Pump ballast resistor wiring schematics? 88 cherokee - JeepForum.com

 
LinkBack Thread Tools
post #1 of 10 Old 07-28-2005, 11:10 PM Thread Starter
KariGrrrl
Registered User
 
Join Date: Oct 2004
Location: Brazil baby, near RioDe HAN-ero
Posts: 107
Fuel Pump ballast resistor wiring schematics? 88 cherokee

Im looking for the wiring diagrams for the fuel pump system including the ballast resistor on an 88 cherokee 4.0L 6 cyl

I found this page below with a ton of diagrams but they dont show the ballast resistor:

http://www.autozone.com/servlet/UiBr...3d80153e8f.jsp

my truck is failing to bypass the resistor on start so i need to see what actually "bypasses" that thing to repair it


88 Cherokee Limited 6cyl 4L stock. Fixed by a girl: in tank fuel pump, TPS, CPS, rear hatch, wiper motor, interior lights, front-rear differential oil, A/C, ballast resistor automatic bypass home-made circuit, power steering, rear wiper motor, 4wd slip, 2 power windows

not fixed: major belt squeak from crank pulley alignment, rear diff gets hot, cruise control, rear bumper rot
KariGrrrl is offline  
Sponsored Links
Advertisement
 
post #2 of 10 Old 07-29-2005, 01:01 AM
Kuasimodem
Registered User
 
Kuasimodem's Avatar
 
Join Date: Feb 2005
Location: Holmen, WI USA
Posts: 961
Just go here and download the factory service manual for 1988 Cherokee. It's in PDF format and helped me learn a lot about mine

The last file in the folder is "wiring diagrams.pdf", that's the one you're looking for. The first two diagrams are the engine electrical for the 4.0L.

White Jeep Club Member #1992
Original Rust Jeep Club Member #5!
Old Guy Jeep Club Member #1992

"The most terrifying words in the English language are: I'm from the government and I'm here to help." - Ronald Reagan

Last edited by Kuasimodem; 07-29-2005 at 01:17 AM.
Kuasimodem is offline  
post #3 of 10 Old 07-29-2005, 07:37 AM Thread Starter
KariGrrrl
Registered User
 
Join Date: Oct 2004
Location: Brazil baby, near RioDe HAN-ero
Posts: 107
oops. thanks. i had downloaded those last week and cant explain why i didnt see that file

88 Cherokee Limited 6cyl 4L stock. Fixed by a girl: in tank fuel pump, TPS, CPS, rear hatch, wiper motor, interior lights, front-rear differential oil, A/C, ballast resistor automatic bypass home-made circuit, power steering, rear wiper motor, 4wd slip, 2 power windows

not fixed: major belt squeak from crank pulley alignment, rear diff gets hot, cruise control, rear bumper rot
KariGrrrl is offline  
post #4 of 10 Old 07-29-2005, 08:22 AM Thread Starter
KariGrrrl
Registered User
 
Join Date: Oct 2004
Location: Brazil baby, near RioDe HAN-ero
Posts: 107
Quote:
Originally Posted by Kuasimodem
Just go here and download the factory service manual for 1988 Cherokee. It's in PDF format and helped me learn a lot about mine

The last file in the folder is "wiring diagrams.pdf", that's the one you're looking for. The first two diagrams are the engine electrical for the 4.0L.
Damned if I can see a ballast resistor in any of those diagrams. maybe they refer to it as something else?

88 Cherokee Limited 6cyl 4L stock. Fixed by a girl: in tank fuel pump, TPS, CPS, rear hatch, wiper motor, interior lights, front-rear differential oil, A/C, ballast resistor automatic bypass home-made circuit, power steering, rear wiper motor, 4wd slip, 2 power windows

not fixed: major belt squeak from crank pulley alignment, rear diff gets hot, cruise control, rear bumper rot
KariGrrrl is offline  
post #5 of 10 Old 07-29-2005, 02:05 PM
Kuasimodem
Registered User
 
Kuasimodem's Avatar
 
Join Date: Feb 2005
Location: Holmen, WI USA
Posts: 961
They call it a resistor pack in the diagram, and it's near the bottom center of the second diagram, I think.

White Jeep Club Member #1992
Original Rust Jeep Club Member #5!
Old Guy Jeep Club Member #1992

"The most terrifying words in the English language are: I'm from the government and I'm here to help." - Ronald Reagan
Kuasimodem is offline  
post #6 of 10 Old 07-29-2005, 02:41 PM Thread Starter
KariGrrrl
Registered User
 
Join Date: Oct 2004
Location: Brazil baby, near RioDe HAN-ero
Posts: 107
Quote:
Originally Posted by Kuasimodem
They call it a resistor pack in the diagram, and it's near the bottom center of the second diagram, I think.
thanks, I did see that but wasnt sure. no i'll go electrocute myself im sure

88 Cherokee Limited 6cyl 4L stock. Fixed by a girl: in tank fuel pump, TPS, CPS, rear hatch, wiper motor, interior lights, front-rear differential oil, A/C, ballast resistor automatic bypass home-made circuit, power steering, rear wiper motor, 4wd slip, 2 power windows

not fixed: major belt squeak from crank pulley alignment, rear diff gets hot, cruise control, rear bumper rot
KariGrrrl is offline  
post #7 of 10 Old 07-29-2005, 06:46 PM Thread Starter
KariGrrrl
Registered User
 
Join Date: Oct 2004
Location: Brazil baby, near RioDe HAN-ero
Posts: 107
Update: sadly I think the diagrams are incorrect. They do not show the correct circuit for the fuel pump power. the power for the fuel pump (not the fuel pump relay) goes through the ballast resistor. The resistor is not shown in the wiring diagram and neither is the electronics that bypass the resistor.

according to the diagrams the fuel pump is powered directly by the fuel pump relay. fuel pump relay goes on.....fuel pump also goes on. thats not correct. they also show the "resistor pack" connected to the power of the fuel pump relay. even if it was referring to the "ballast resistor" its still not the correct wiring.

i dont know which truck is which but my truck says "Cherokee" on it. Sometimes they call it "cherokee Limited". is that a different truck?

This is how is actually is wired:

gnd +12v
| |
| >
| > ballast resistor
| >
| |
| |
| |
FUEL PUMP

either they have some other relay that shorts out the resistor or they have 12v connected to the bottom of that resistor so that 12v can go to the motor just before the truck starts. or maybe its something in the ignition switch that does it?

88 Cherokee Limited 6cyl 4L stock. Fixed by a girl: in tank fuel pump, TPS, CPS, rear hatch, wiper motor, interior lights, front-rear differential oil, A/C, ballast resistor automatic bypass home-made circuit, power steering, rear wiper motor, 4wd slip, 2 power windows

not fixed: major belt squeak from crank pulley alignment, rear diff gets hot, cruise control, rear bumper rot
KariGrrrl is offline  
post #8 of 10 Old 07-29-2005, 07:02 PM
JoBo
Registered User
 
Join Date: Jul 2004
Location: Columbus, Ohio, USA
Posts: 1,430
The voltage from the fuel pump relay goes through the resister for running. When starting it gets the full 12 volts directly from the start relay that's the metal box right behind the battery on your XJ. There's a lot of wires attatched to it. there has been a few instances of them going bad lately as they're over fifteen years old

JoBo
JoBo is offline  
post #9 of 10 Old 07-29-2005, 07:19 PM
coppertop71
Senior Member
 
coppertop71's Avatar
1990 XJ Cherokee 
 
Join Date: Jun 2004
Location: Vancouver, WA
Posts: 953
I just went to that link for FSM and at the bottom of the page is a link to more PDF downloads. Try this link and go down to the Jeep menu and look for Renix fuel injection manual. It covers everything about the fuel and spark system. 100 pages worth.


Sundress

Mods
2006 Jeep Wrangler X, 4.0 4:11 gears

'90 Cherokee XJ,W/'91 4.0L reman/ 3.5" RE lift, W/31" M/S tires, 4:11 Gears W/Speedo gear change/ Aluminum Coolant Tank
A/C Conversion/Home Built Roof Rack/K&N Box Filter
Derale 15" Rigid Radiator Fan PT# DER-17415, through Summit W/2"X5/8X5/8"" spacer


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
coppertop71 is offline  
post #10 of 10 Old 07-29-2005, 07:41 PM Thread Starter
KariGrrrl
Registered User
 
Join Date: Oct 2004
Location: Brazil baby, near RioDe HAN-ero
Posts: 107
JoBo - thanks so much. I was going to eventually post if itd be a good idea to just wire from the starter to the pump so i was correct. im going to run a wire direct after this post and not worry about whats broke or frayed.

coppertop - thanks. great stuff on there. i'll be reading through that tonight. Sundress, ha ha ha very frickin funny. my washing machine still smells like the starter fluid i used to clean the dress. grease from the truck is one thing but who the hell knows whats on the side of the road.

kari (car - e or car-ree. not carrie or carry)

88 Cherokee Limited 6cyl 4L stock. Fixed by a girl: in tank fuel pump, TPS, CPS, rear hatch, wiper motor, interior lights, front-rear differential oil, A/C, ballast resistor automatic bypass home-made circuit, power steering, rear wiper motor, 4wd slip, 2 power windows

not fixed: major belt squeak from crank pulley alignment, rear diff gets hot, cruise control, rear bumper rot
KariGrrrl is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Fuel Pump Ballast Resistor Untouchable XJ Cherokee Technical Forum 10 02-04-2010 06:31 PM
messed up fuel pump ballast connectors Willy36 XJ Cherokee Technical Forum 4 08-14-2009 12:28 AM
Start but no run..ASD...ballast resistor...or pump relay? Laodicea XJ Cherokee Technical Forum 4 02-19-2008 03:35 PM
ballast resistor relay 92 cherokee sport BiGsTiCk XJ Cherokee Technical Forum 2 02-09-2008 04:12 PM
98 cherokee NSS wiring??Schematics? seank XJ Cherokee Technical Forum 5 02-22-2006 10:17 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome