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Unread 01-12-2011, 08:23 PM   #1
bella mia
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Mystery part electrical part. 88YJ 2.5

There are two red wires that come off the alternator and run to the firewall and go to a part low on the firewall. At first I thought it was a terminal block but it has multiple wires on it an it resembles a large relay or breaker. It is about 1.25 inches wide and about 2.5 inches high and about 1.25 inches deep. I need to know what it is and if I can eliminate it. I have converted my yj to msd ignition and a weber 34 ICH carb. I am doing a total custom rewire and trying to eliminate anything I can. Help please.

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Unread 01-12-2011, 08:28 PM   #2
Yamahafreak93
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I am pretty sure that is the reference wire to tell your alternator how much voltage to produce. Thay are the two that are on top of the alternator almost right?
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Unread 01-12-2011, 08:33 PM   #3
bella mia
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I need to know what the part is on the firewall that the two wires go to. I converted to carb and stand alone ignition and am eliminating a lot of the old FI wiring. I am tring to see what this is and if I need it. Thanks for answering.
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Unread 01-12-2011, 08:53 PM   #4
Yamahafreak93
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i dont know what the partt is called on the fire wall. does it go straight through into your MCU? cause i think the wires run to the MCU. it either runs to your MCU or ICM
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Unread 01-12-2011, 09:06 PM   #5
Castr8r
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The part on the firewall is a relay; the stud sticking out of the top of it is the power distribution center. The hot wire from the battery runs to it and most of the wires coming off of it are fusible links with the exception of the wires from the alternator. If you eliminate it, the starter will not work.
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Unread 01-12-2011, 10:00 PM   #6
laybackman
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That starter relay gets activated with the ignition switch to start the engine also.
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Unread 01-12-2011, 10:19 PM   #7
bella mia
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Freezin cold for here an I just went outside and looked at the part. It is a terminal block as you said it is. I have gotten rid of a lot of wiring since I got rid of the RENIX FI. I am almost done and am replacing most of the stock wiring. The starter is going to be by a momentary on switch to the solenoid. Thanks for the help.
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Unread 01-12-2011, 10:29 PM   #8
bella mia
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Do you know what the two blue relays are that are between the battery and the fenderwall.
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Unread 01-13-2011, 08:53 AM   #9
laybackman
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Quote:
Originally Posted by bella mia View Post
Do you know what the two blue relays are that are between the battery and the fenderwall.
Pictures would help us a lot.

Heavy duty switches are expensive. A relay is a cheap replacement for them. You use low amperage to close (or open) the relay. The heavy voltage goes through the relay to the device that needs the power.
If they look like they are added on then they could be for fog lights or an alarm system...who knows!
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Unread 01-13-2011, 09:03 AM   #10
Que89YJ
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Try this
image108.jpg   image110.jpg   image112.jpg   image114.jpg   image086.jpg  

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Unread 01-13-2011, 09:33 AM   #11
bella mia
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I am almost done with my Renix removal and when I am done there will be maybe only two or three relays on my 88 YJ. I am putting a floor mounted headlight dimmer push on push off switch on the floor to take the high beams off. I have a heavy duty switch panel under the heater controls that controls the MSD ignition, fuel pump, headlights, wipers. I am putting a momentary push on switch to start the engine. No relays except for the horns and a few non operational accessories. The RENIX FI system was a super pain.
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Unread 01-13-2011, 09:39 AM   #12
bella mia
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Thanks for the great drawings. By the end of today the starter relay will be history. BTW Early YJ owners deserve a special place in heaven or whatever place you believe. These Model jeeps are like pets. You have to love em to keep em. The wiring is horrible. I spent two days trouble shooting the fuel guage not working. Found it to be the thin piece of plastic with copper film for the circuits behind the dash guages. It is like a printed circuit connecting all the guages and lights for the dash guages. Except it is thin flexdible palstic. The YJ is flat behind the dash and I am going to take the whole panel off and replace it with metal diamond palate and make it look like a CJ. Both for the look and to get rid of all the horrible wiring.
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Unread 01-13-2011, 09:39 AM   #13
bella mia
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Sorry.
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