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#551541 - 01/13/05 01:34 AM Need help locating relay and/or voltage regulator  

I've got an electrical problem with my '89 Raider thats left me dumfounded. My front marker lights, rear tail lights, license illuminating lights, and dash illuminating lights stopped working. I have checked all the easy stuff, ie. fuses, bulbs, etc. What I have found is that the fuse for the tail lights has no power at the positive pin at the fuse box. If I jump a hot wire to the tail light fuse, the lights work, also if I jump a hot wire to the dash lights dimmer positive wire they work. However, if I jump two seperate hot wires to the tailight fuse, and the dash light dimmer positive wire at the same time, only the tail lights work, the dash lights go out. I think I have a bad relay somewhere, but I don't know where the right one is??? Also the Haynes book briefly mentions an "instrument cluster voltage regulator" I might add that all dash "dummy lights", gauges, turn signals, etc. work fine. Also the front and rear turn signals work fine as does the brake lights, headlights and back up lights. I would like to fix this thing myself without jury rigging. Sure would appreciate any guidance you can give. <img src="/forums/images/graemlins/confused.gif" alt="" />

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#551542 - 01/13/05 02:52 AM Re: Need help locating relay and/or voltage regulator  
off-roader  Offline

Web Wheeler
Joined: Jan 2000
Posts: 16,224
Bay Area, CA *****

I had a similar problem with my lighting (although not exact) in the past and for me it was the wiring leading to my headlight relay.

Before you head down that path however I do have some preliminary questions...

Have you made any modifications or changes to the rig in the past year using either non-mitsu or mitsu equivalent/identical parts?
Have you made any modifications within your engine bay?
Do you have a car alarm?

In my case, it ended up being an aftermarket compressor I installed in the engine bay who's bracket's rubbed through a wiring loom's tape & insulation causing a problem with the lighting. It could have been pretty much anything on the loom but in my case I ended up shorting out parts of the lighting system.

Another suspect area is the quality of an aftermarket connector. In may installations that tie into existing wiring, the use of crimp on connectors without solder & weather proof insulation can create wierd faults which is caused by the weather corroding the surfaces around the connection giving you either an intermittent connection or no connection at all.

Oh, don't forget things like an aftermarket tow hitch install as well since it does tie into the lighting system.

Also, that haynes manual is great for SUPER BASIC maintenance, or starting a campfire. I'd suggest buying a factory service manual. I've heard there are soft copies but you'll need to search for that because I think most aren't so fool hardy that they'll openly offer you a copied manual which is still currently copyrighted. <img src="/forums/images/graemlins/shiner.gif" alt="" /> <img src="/forums/images/graemlins/shiner.gif" alt="" /> <img src="/forums/images/graemlins/shiner.gif" alt="" />

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#551543 - 01/13/05 03:14 AM Re: Need help locating relay and/or voltage regulator [Re: off-roader]  

Thanks Off-Roader,

My Raider is totally stock, I'd like to keep it that way too! This electrical problem started after I offered to jump start someone and mistakenly tried to hook the jump cables to the battery posts in reverse polarity. It was day light when I did that goof, but later when it got dark and there were no dash lights, I figured some fuses may have blown. I think it must be a relay or some such, as I have already checked the easy stuff, fuses, fusible links, bulbs, etc. <img src="/forums/images/graemlins/confused.gif" alt="" />

#551544 - 01/13/05 05:52 AM Re: Need help locating relay and/or voltage regulator  

i had a very similiar problem but it was an 88 and it had a few different problems (no brake lights, or turn signals, etc). it was the hazard switch, some how it was broke inside and not was between contacts and some how they have all this lighting running thru that hazard switch???
took the switch apart and slid contacts in place and everything works except the hazards (switch is still broke and i have not gotten around to switching it out with another one)

#551545 - 01/13/05 07:51 PM Re: Need help locating relay and/or voltage regulator  
conner  Offline
Rock Warrior
Joined: Aug 2004
Posts: 644
When the light switch is activated, the green and white wire supplies a ground to the light control relay which supplies power to the red and white wire to the fuse. Check for power at the red wire on the relay first. No power- blown fusibile link. If you have power, ground the green and white with the headlamp switch on. if no power at red and white,replace relay. The relay is located near the left front headlamp. Good luck

Over the hill but still climbing.
88 Montero 2.6L auto, manual hubs, cooling fan conversion gps,recurved distributor,LSD Diff.

#551546 - 01/13/05 08:00 PM Re: Need help locating relay and/or voltage regulator  
fasteddy  Offline
Web Wheeler
Joined: Jan 2001
Posts: 13,649
Helen , GA *****
the instrument cluster voltage regulator has nothing to do with the lights. It regulates the current to the fuel and water temp gauges to 7v, and that's all it does.

The lighting relay is behind the driver's side headlight in the engine bay. Two relays in the box. One is dedicated to headlights only, and has a fat red wire for power in, and red/blue stripe for power out to the lights, and a skinny red for the ground path thru the switches for the relay coil. The other relay is for all other lights. Another fat red for power in, red/white for power out to lights, and green/white for the relay coil ground path via the switch. Happy metering.

Not responsible for advice not taken...

#551547 - 01/14/05 03:11 AM Re: Need help locating relay and/or voltage regulator [Re: fasteddy]  

Thanks Conner & Fast Eddie,

Gave me some direction on where to do some more metering. I'm hoping that it's the "other" relay. I already tested all the fusible links, they are all good. With a little luck I can close the deal on this thing tomorrow.

Moderated by  Macka, Mudraider, off-roader, PajEvo, rxinhed 

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