Suzuki: 95 sidekick jx 5spd electrcal problem, geo dealer, temp gauge

Question
QUESTION: You have helped me greatly before and I hope you can help again.   Left turn signal started clicking and buzzing the other day and after wigglin' it it came on.  That night I went to use the car again and went to turn on the lights and it caused my radio to turn off for a second, then as I drove every time I would use the brake the headlights would blink for a second (only when I would just touch the brake pedal not as it was depressed).  I use this car to deliver papers so I use the lights for 3-4 hours per night. Last night I needed to use the hazard switch for on coming traffic and apon hitting the switch, head lights went off and I quickly hit the switch again brining them back on.  When I got home and went to park the car I turn the ignition off before the lights (which would have left all lights and fan/radio turned on) but all went black and the car wouldnt start again not even a click. I thought I'd check the battery cables and while standing in front of the car opening the hood everythin came back on.  Local Chevy/geo  dealer said its most likely a faulty hazard signal switch and or relay.  Any clue?  Any where I can find a diagram of wiring to look for bad grounds without tearing everything apart?  Fuses are good, relays I'm not sure how to check.

ANSWER: The only place I can think of is in a Suzuki FACTORY Manual.  The Chilton and Haines are "generic" and may not apply to your vehicle.
I don't know any other way that has a good chance of ultimately being successful.  It sounds like a ground issue.  
AL

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QUESTION: found it, had a loose positive cable, not the terminal but the part of the cable that gets clamped in.  Have checked and replaced both thermostat gauges that are mounted to the head trying to resolve a " floating " temp gauge (dashboard) that goes almost in to hot when I make left turns then back down when I straighten out.  Could the gauge in the dash go bad? How do you replace it without replacing the whole intrument cluster?

Answer
Check the gauge, circuit board and power and grounds first.  Then find the wire that comes from the sender.  Disconnect the sender connect it to ground through a test light, then direct to ground.  You should get varying readings from the gauge.  If you can get the instrument separately, it's not that big a deal to take the instrument cluster apart.  Usually the hardest part is getting the cluster out of the vehicle.
scotty