Oliver

iTrader: (4)

I have a vehicle that was torn apart before an engine swap and might not have been put back together correctly. I have the dash lights completely powered, but have no head or taillights. I am not familiar with rx7s at all, but believe I have the problem solved. I would just like some input from those more familiar with these vehicles.
I did a little digging around in the engine bay, and have found that I may be missing a piece of harness that goes from the passenger headlight to the passenger floor board. If this is correct or if someone knows of another issue that I should look to, please speak up!
Thanks in advance for the input.

David

durtled

maybe when they tore the car appart they forgot to reconnect all the wires in the passenger kick or around there some where i know the computer is around there also. and maybe they forgot to hook up all the wires behind the gauges in that case that sux. do ur brake lights work? back up lights? if those 2 work i would ponder on hooking up ur running lights headlights and taillights to aftermarket switches. its better than nothing if u can't figue out the problem

satch

iTrader: (1)

When you state you have no headlights or tail lights is this all of the headlights and tail lights or just some of them are not working?

You need to check the headlight switch as this unit controls both the headlights as well as the tail lights. Also check the headlight harness for burn marks as it is noted for causing such problems. But first check the Head fuse in the engine fuse box to see if it is good or not as the headlights will not turn on if it is bad and also check the 15 amp Illumination fuse in the interior fuse box. If both of these are good then with respect to the headlight switch check to see if the White/Green wire has constant voltage on it and also check the Red/Black wire to see that it has voltage on it when you turn the headlight switch **** to the first position as this wire powers up the tail lights. No key in the ignition is necessary.

Oliver

iTrader: (4)

Thanks Satch. It's rare to find such a good reply post.
I have no head lights or tail lights functioning. uThe head light switch will power my interior lights, so I believe the switch to not be the problem. I am going to go over your post again, and check all the things you suggested tonight.

satch

iTrader: (1)

If the dash lights work then the illumination fuse is good to go (this was an oversight by me) but the R/B wire (tail lights) is likely w/o power. If the dash lights work then the White/Green wire has constant voltage on it and it is good to go as well. If you jumpered a wire from W/G to R/B as the harness plugs into the switch this should turn the tails on if the wiring as well as the bulbs are good. If it doesn't then the headlight harness and or remaing harnesses are bad and or the bulbs.

If the head fuse is good then you would need to focus on the headlight relay located at the front of the car just to the right of the hood latch. The relay in question is the second from the left just to the right of the dimmer relay. The headlight relay has four wires to it. Two Red, Red/Green, and White/Blue. Unbolt the relay to gain better access to the plug side of the relay. Verify that both Red wires have constant voltage (no key necessary). Then turn the headlight switch to full on and check for voltage on the R/G wire in the relay as it should have voltage. If it doesn't but the Red wires both have constant voltage then the problem lies within the White/Blue wire as its purpose is to put a ground to the relay when the switch is turned to turn the lights on to cause the coil inside the relay to activate and close the relay so voltage passes from the Red wire to the Red/Green wire (the R/G wire goes to the headlight bulbs via the dimmer relay).


To check the White/Blue wire there are two things you could do. One is with the plug connected to the relay stab a jumper wire into the back of the plug where the W/L wire resides and then place the other end of the wire to a known ground such as the alternator housing or negative battery terminal. Doing this should force the lights to turn on ( if the lights are in the up position they should light up or if they are in the down position they should still light up but the lights would illuminate the flash to pass lens). The other way to check the W/L wire is with the use of an LED light and do this with the headlight switch turned to turn the lights on position. Use the car battery to figure which lead is positive and negative regarding the light and then place the ground wire of the LED light into the back of the plug where the W/L resides and then take the positive wire of the LED light and place it to a voltage source. If both Red wires in the relay plug have voltage then pick one of the two and the LED light should turn on. If it doesn't turn the lights on then the headlight switch/wiring is not doing its job properly of putting a ground signal on this wire as required.