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Username Post: 1972 Nova Turn Signals        (Topic#368647)
HandyAndy 
Newbie
Posts: 33

Loc: Iowa City, IA
Reg: 09-05-19
06-09-22 04:59 PM - Post#2842626    

My buddy has a 1972 Nova and the turn signals don't work. Interestingly enough, the four-way flashers work?

I assume the light sockets and grounds are good. Could it be a flasher or the turn signal switch? If I'm not mistaken, the turn signals and four-way flashers have separate flashers.

Any troubleshooting suggestions would be appreciated.

HandyAndy


 


HandyAndy 
Newbie
Posts: 33

Loc: Iowa City, IA
Reg: 09-05-19
08-20-22 05:36 PM - Post#2846197    
    In response to HandyAndy

Update: We finally spent some time chasing the turn signal issue around. The main gauge cluster connector was corroded. We cleaned that and the fuel gauge began to work! I noticed the main fuse block is also quite corroded. Can someone explain how the fuse block is wired? It looks like there are two circuits to a fuse (see LINK 1973 Nova Fuse Block -example). Initially, I checked for continuity on the fuses; however, it appears the clamps for the fuses are corroded and likely the problem. It seems to me that even if the fuse is good and power is available, for example the DIR. SIG. and BACK UP circuit, and the fuse clamp is corroded power may not be available to a given circuit. I ended up wiring an ignition wire to the turn signal flasher and the signals seem to work fine. For some reason, 12V power is not making it to the flasher: bad connection, broken wire, something else?



HandyAndy


 
HandyAndy 
Newbie
Posts: 33

Loc: Iowa City, IA
Reg: 09-05-19
09-09-22 08:59 AM - Post#2847073    
    In response to HandyAndy

Here's a couple pics from a donor fuse block. Maybe they will help someone else out......

GM Fuse Block

HandyAndy


 
HandyAndy 
Newbie
Posts: 33

Loc: Iowa City, IA
Reg: 09-05-19
09-23-22 09:17 AM - Post#2847697    
    In response to HandyAndy

We finally got some positive results with the electrical problems. The connector on the back of the gauge cluster was disconnected and cleaned. Also, the fuses were removed and the fuse clamps were cleaned up with a Dremel tool. The turn signals are now working through the stock wiring harness.

All the circuits on the fuse block have continuity from fuse clamp to fuse clamp with a fuse in place, with one exception: the INST LPS 4A. There isn't any power to that circuit. A green wire runs to the headlight switch and a gray wire runs to the printed circuit board connector, both wires originate at the fuse block. In fact, with the headlights on and the headlight switch turned to the left for a dome/courtesy light the green turn signals are dimly lit? The turn signals work just fine regardless of the headlight switch position.

I'm wondering if there's still a problem with the printed circuit board on the back of the gauge cluster?

HandyAndy


 
Tony 
Founder & Grand PoohBah
Posts: 18912
Tony
Age: 66
Loc: Georgetown, Texas
Reg: 03-15-99
09-23-22 10:52 AM - Post#2847702    
    In response to HandyAndy

Thanks for keeping us updated Andy!

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