Always weird stuff

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spidernut
Posts: 1906
Joined: Wed Jan 25, 2006 12:20 am
Your car is a: 1979 Fiat Spider Automatic
Location: Lincoln, CA

Always weird stuff

Post by spidernut »

Today, I decided to install a new stereo to replace the original 1979 AM/FM that went out. I've wired stereos to a Spider door chime before, so it was no big deal, right? Simple process. So answer me this Batman:

1. Key in ignition, ignition in off position: radio has power
2. Key in the ignition, turned to the first click position (run), radio has power
3. Key in the ignition, start motor, radio powers off.

I must have hooked it up to a different relay, right? Nope...double checked it, triple checked it.

Things that make you go "hmmmmmmmmmmmmmmmmmmmmmmmm"
John G.
1979 Spider (Owned since 2000)
1971 124 Sport Spider (Owned since 2017)
1977 Spider (Sold 2017)
1979 Spider (Disposed of in 2017)
1979 Spider (Sold 2015)
1980 Spider (Sold in 2013)
1981 Spider (Sold in 1985)
2017 Spider (Owned since 2019)
wizard124
Posts: 752
Joined: Mon Oct 29, 2012 9:27 pm
Your car is a: 1980 124 spider FI
Location: Sheridan, WY exSan Rafael, CA

Re: Always weird stuff

Post by wizard124 »

John,
my guess is the radio shuts down due to low voltage caused by the power drain of starting the car. The radio turns back on with the engine running by re-pressing its power button,,,,yes?

My boat's combo unit always does the same thing. Start the engine and the GPS/fishfinder shuts down. I think the newer electronics self-protect.

Warren
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spidernut
Posts: 1906
Joined: Wed Jan 25, 2006 12:20 am
Your car is a: 1979 Fiat Spider Automatic
Location: Lincoln, CA

Re: Always weird stuff

Post by spidernut »

I went back and rechecked it.

There is power to the door chime when the key is in the ignition and the key is in the off position
There is no power to the door chime when the key is in the on/run position

I spliced into the door chime wire (orange/white). The door chime is still hooked up and operates.

Is the door chime supposed to sound if the motor is running and the door is open?
John G.
1979 Spider (Owned since 2000)
1971 124 Sport Spider (Owned since 2017)
1977 Spider (Sold 2017)
1979 Spider (Disposed of in 2017)
1979 Spider (Sold 2015)
1980 Spider (Sold in 2013)
1981 Spider (Sold in 1985)
2017 Spider (Owned since 2019)
User avatar
spidernut
Posts: 1906
Joined: Wed Jan 25, 2006 12:20 am
Your car is a: 1979 Fiat Spider Automatic
Location: Lincoln, CA

Re: Always weird stuff

Post by spidernut »

SOLVED: It is the ignition switch. Turn the key slightly to the right or left and the radio powers up. Looks like I'll have to operate!
John G.
1979 Spider (Owned since 2000)
1971 124 Sport Spider (Owned since 2017)
1977 Spider (Sold 2017)
1979 Spider (Disposed of in 2017)
1979 Spider (Sold 2015)
1980 Spider (Sold in 2013)
1981 Spider (Sold in 1985)
2017 Spider (Owned since 2019)
dmwhiteoak
Posts: 1088
Joined: Mon Aug 15, 2011 1:12 pm
Your car is a: 1972 Fiat 124 spider
Location: White Oak Tx

Re: Always weird stuff

Post by dmwhiteoak »

Mine does the exact same thing, once its running I have to rotate backwards and pull out a little. PITA but Im used to it by now. If you find a solution, let me know.
Dennis Modisette

1972 124 Spider
2003 Chevrolet Z71
2007 GMC Yucon
User avatar
spidernut
Posts: 1906
Joined: Wed Jan 25, 2006 12:20 am
Your car is a: 1979 Fiat Spider Automatic
Location: Lincoln, CA

Re: Always weird stuff

Post by spidernut »

Here's my plan for rebuilding the ignition. It is most likely an issue of dirty contacts in the ignition switch.

http://www.mirafiori.com/faq/content/switch/index.html
John G.
1979 Spider (Owned since 2000)
1971 124 Sport Spider (Owned since 2017)
1977 Spider (Sold 2017)
1979 Spider (Disposed of in 2017)
1979 Spider (Sold 2015)
1980 Spider (Sold in 2013)
1981 Spider (Sold in 1985)
2017 Spider (Owned since 2019)
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