How-To web sites??

[mazdaerattiguy]

Does anyone know of a "how to" web site for troubleshooting and fixing brake light electrical system problems? Sepcifically, the brake lights in the fenders do not work but the high center light does. Anyone know how to fix this? I have replaced all of the bulbs. Running lights and backup lights work.

[Negatoro]

I'm going to assume you're talking N body, '97-'03..
This is what I would do..

1.)Make sure you use known GOOD 3057 tail/stoplamp bulbs to verify a problem with the circuit.

2.)Check driver's side fuse panel.. there's a stoplamp fuse in there, 15A.
Maybe you'll get lucky there.

3.)Next, check for brake circuit voltage at the tail lamp connector.
--pick a side to work on.
--remove thumb nuts and pull back trunk carpeting.
--unclip harness connector from the tail lamp housing.

With a voltmeter or testlight, test connector for voltage between the light blue and black wires with the brake pedal depressed.

It doesn't hurt to test the other side while you're at it.

If ~12V present then you have a problem with the lamp housing circuitry.
If zero voltage present then you have a problem with the stoplamp circuit; Probably at the splice pack.

Get back to me and I'll try to help you on out.

-Mark T.