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  #1 (permalink)  
Old 03-14-2022, 09:41 AM
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Default Electrical issues

I have been chasing electrical issues the past week. Below is what is going on:

10 VOLTS ON VOLT GAUGE, 12+ AT ALTERNATOR
TURN SIGNAL CAUSE THE TACH TO JUMP UP AND DOWN
HEAD LIGHT ONLY WORK IF I HOLD THE HIGH BEAM BUTTON
ANYTHING ELECTRICAL CAUSES THE VOLTS TO DROP IE FANS, FUEL PUMP, ETC

I WAS THINKING BAD GROUND. SO FAR I HAVE FOUND GROUNDS AT FRONT PASS SIDE FRAME, UNDER PASS SIDE DASH, PASS SIDE FLOOR, MOTOR GROUND AND THE BATTERY.

ANY HELP IS APPRICIATED
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Old 03-14-2022, 12:15 PM
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Sorry not a of of help most times it is a ground problem
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Old 03-14-2022, 02:01 PM
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More info would help. Use a multimeter.
  1. Is the battery fully charged?
  2. Voltage at battery with engine off?
  3. Voltage at battery with engine at idle?
  4. Voltage at battery with engine at 2500 RPM?
  5. Does voltage at gauge match voltage at battery?
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Last edited by Tommy; 03-14-2022 at 02:07 PM..
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Old 03-14-2022, 07:21 PM
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Default fuses

Try to isolate the shorts by pulling out fuses until it is better, then put one fuse in at a time until you find a bad circuit. Also disconnect the rad fan as it can cause alot of trouble if it is wired anywhere the alternator.
good luck
Perry
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F5 cobra Mark 4 roadster, dual roll bars, warmed up 302, E Street aluminum Heads, Comp cam and roller rockers, AOD, 4.10 Eaton Possi, Baer/disc brakes, one off under car exhaust, F500 18" black spoke wheels.
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Old 03-15-2022, 12:08 PM
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Default Ignition switch?

Had a jumpy tach, and gauges that were incorrect and moved a lot when things were switched on. Checked all grounds from battery to frame to engine to starter to dash to... well you get it. Turned out the starter switch was not fully completing the accessory circuit when turned on. less than 12v across terminals (10.5v as I recall). New switch fixed it for me.

Marty
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Old 03-17-2022, 09:13 AM
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Default switch

Thanks FlyingGumby! I changed the ignition switch last night and now I get 12 volts. Going to look into the alternator next since the gauge should ready 13 ish volts. Never would've thunked it would be the ignition switch
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Old 04-09-2022, 08:40 AM
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Default ignition switch PN

hey Misfit I'm having same issue where u get switch at
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Old 04-10-2022, 06:29 PM
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Did you try Iconic?
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Old 04-11-2022, 04:26 AM
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Quote:
Originally Posted by russdana View Post
Did you try Iconic?
Yea> Backordered ,I found one at speedway motors I'm going to try
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Old 04-11-2022, 06:19 AM
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Quote:
Originally Posted by BDR0572 View Post
hey Misfit I'm having same issue where u get switch at
I just used a old Cole Hersee switch I had in old inventory at work similar to this https://www.littelfuse.com/products/...-switches.aspx. If you are around 290 and beltway I will give you one.
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Old 04-11-2022, 09:03 AM
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Trying this again... clubcobra may not have liked an embedded link.

Hadn't considered a marine switch but it would be a good choice. Currently using a Lucas switch purchased from Triple-C but the post is a bit small. The bezel nut barely covers the hole on carbon dash. Will get a billet bezel plate or install a switch for 7/8 - 1" hole like the Cole Hersee.
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Old 04-11-2022, 10:04 AM
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let me know if you want one, i have several still in the MFG packaging
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Old 04-11-2022, 06:03 PM
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Quote:
Originally Posted by FlyingGumby View Post
Trying this again... clubcobra may not have liked an embedded link.

Hadn't considered a marine switch but it would be a good choice. Currently using a Lucas switch purchased from Triple-C but the post is a bit small. The bezel nut barely covers the hole on carbon dash. Will get a billet bezel plate or install a switch for 7/8 - 1" hole like the Cole Hersee.
After a certain amount of post, ~5-10, you will then be able to post links and pictures. Welcome aboard!
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Old 04-12-2022, 06:17 PM
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@MISFIT 1
Game to try out the switch. Sent you a PM.
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Old 04-13-2022, 07:02 AM
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Default switch

Quote:
Originally Posted by MISFIT 1 View Post
I just used a old Cole Hersee switch I had in old inventory at work similar to this https://www.littelfuse.com/products/...-switches.aspx. If you are around 290 and beltway I will give you one.
Thanks Bud yea I'm not to far from there ,thanks I have one coming from Speedway it looks almost identical to what's in there ,If that is the cheapest thing I have to buy, I'm good had alternator tested off car shows good, I will reply with info once i have switch to let all know how it fairs Thanks to all who replied ya make owning this ride a joy ..

Last edited by BDR0572; 04-13-2022 at 07:08 AM..
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Old 04-13-2022, 07:24 AM
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Quote:
Originally Posted by BDR0572 View Post
Thanks Bud yea I'm not to far from there ,thanks I have one coming from Speedway it looks almost identical to what's in there ,If that is the cheapest thing I have to buy, I'm good had alternator tested off car shows good, I will reply with info once i have switch to let all know how it fairs Thanks to all who replied ya make owning this ride a joy ..
Let me know how things work out. you can bring the car to my house and we can trace the electrical if you like, I have been looking for the issue for 6 months. Check your grounds, some are under the car and hard to get to without a lift
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Old 04-14-2022, 08:16 PM
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Default wire trace

Quote:
Originally Posted by MISFIT 1 View Post
Let me know how things work out. you can bring the car to my house and we can trace the electrical if you like, I have been looking for the issue for 6 months. Check your grounds, some are under the car and hard to get to without a lift
Thanks ,yea i got my switch yesterday installed today and my alt is steady at 14 vdc on gauge and digital i installed to verify (also has usb for my go pro) I go back to work Tuesday be gone for 14 days but get back i can come help run checks if you like . My weekend is tied up with car club show u more than welcome to come walter hall park in league city sat

https://drive.google.com/file/d/1HuK...ew?usp=sharing
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Old 04-14-2022, 08:22 PM
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The switch I got was from speedway motors and is almost exact to the original and price is avg but works fine, i do notice it is more rigid ..no telling how long my switch was heading out .
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Old 04-15-2022, 05:49 AM
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https://drive.google.com/file/d/1E5K...ew?usp=sharing

assume you have a wiring diagram if not here's one.
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Old 04-26-2022, 09:42 AM
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Didn’t like the fit of a recently installed Lucas ignition switch made for a 3/4” hole. Searched for a new switch by shape and size of the original key thinking it could be cut to fit an existing locking gas cap.

Found this one for $10… https://www.amazon.com/dp/B084M7WL4H...roduct_details

Fits dash perfectly and the key worked with locking gas cap unmodified.
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