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1971 corvette starting issue

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Old Nov 27, 2017 | 08:52 PM
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Default 1971 corvette starting issue

Power to starter from battery, no power any where else. Replaced battery because defective still no power. What relay is mounted on drivers side upper fender well. It has two fuseable links. One wire is soft at connection. What is this relay/switch?
I had a SS Chevelle that had same issue and it was this connection. That caused the iissues.
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Old Nov 27, 2017 | 08:59 PM
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Originally Posted by thelal1
Power to starter from battery, no power any where else. Replaced battery because defective still no power. What relay is mounted on drivers side upper fender well. It has two fuseable links. One wire is soft at connection. What is this relay/switch?
I had a SS Chevelle that had same issue and it was this connection. That caused the iissues.
Horn relay
It should be hot as it's fed directly from the starter solenoid lug that the bat cable attaches to.

Last edited by Hammerhead Fred; Nov 27, 2017 at 09:19 PM.
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Old Nov 27, 2017 | 09:00 PM
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Sorry/I have no advice.
BUT.....do you remember what fried the fusible link in the first place on your Chevelle ......so you won't have repeated problems on the Vette?
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Old Nov 27, 2017 | 10:13 PM
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Default Loss of power

Originally Posted by Hammerhead Fred
Horn relay
It should be hot as it's fed directly from the starter solenoid lug that the bat cable attaches to.
So if it is fed directly from starter solenoid lug where does that power travel to from that horn relay?
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Old Nov 27, 2017 | 11:22 PM
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Originally Posted by thelal1
So if it is fed directly from starter solenoid lug where does that power travel to from that horn relay?
The horn relay is for all intent and purpose the +12vdc power distribution point. The connection to the starter solenoid is one of the two FL's. The other runs to the fuse block to provide power to the rest of the car. The hot lead from the alternator also connects here. So with the car off and a fully charged battery you would read ~12vdc, and with the car running the reading is what the alternator is putting out, assuming all systems are functioning properly.
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Old Nov 27, 2017 | 11:36 PM
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Originally Posted by thelal1
So if it is fed directly from starter solenoid lug where does that power travel to from that horn relay?
Might want to verify that you have power at the horn relay (10g Red) coming from the starter first. If not I'd be checking the fusible link nearest the starter that feeds the horn relay. The link nearest the horn relay runs to the bulkhead connector on the firewall.

Have you checked to see if you have power at any of the fuses?
Keep in mind it's not a metal car body - You could just be having a grounding issue.
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Old Nov 28, 2017 | 07:30 AM
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Originally Posted by dosoctaves
The horn relay is for all intent and purpose the +12vdc power distribution point. The connection to the starter solenoid is one of the two FL's. The other runs to the fuse block to provide power to the rest of the car. The hot lead from the alternator also connects here. So with the car off and a fully charged battery you would read ~12vdc, and with the car running the reading is what the alternator is putting out, assuming all systems are functioning properly.

distribution point , no power to side of horn relay.
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Old Nov 28, 2017 | 07:42 AM
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H ta,
Are you aware of the clutch 'interlock switch'?
The clutch pedal must be pushed to the floor to complete the circuit to the starter when the key is turned to start.
Regards,
Alan
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Old Nov 28, 2017 | 08:32 AM
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Originally Posted by Alan 71
H ta,
Are you aware of the clutch 'interlock switch'?
The clutch pedal must be pushed to the floor to complete the circuit to the starter when the key is turned to start.
Regards,
Alan
Alan power nowhere, lights,nothin, at the horn relay no power from selonoid up. Could it be the fusable link at selonoid?
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Old Nov 28, 2017 | 08:44 AM
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Originally Posted by thelal1
Alan power nowhere, lights,nothin, at the horn relay no power from selonoid up. Could it be the fusable link at selonoid?
ignition switch, someone mentioned that, but there is no power anywhere. Not even coming up from selonoid
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Old Nov 28, 2017 | 09:26 AM
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Hi ta,
This is the appearance of an 'intact' fusible link at the starter.
Typically there is SOME sign that the link has been used…. but not always.
Regards,
Alan



Here's the typical fusible link at the horn relay.


Last edited by Alan 71; Nov 28, 2017 at 09:39 AM.
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Old Nov 28, 2017 | 10:10 AM
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I'd verify that the bat cable connected to the starter is hot.
If so;
Then see if the wire running from the starter to the horn relay is hot on both sides of that fusible link at the starter (shown in Alan's photo).

If all the above is hot only then would I start tracing from the horn relay.
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Old Nov 30, 2017 | 07:26 PM
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Default 1971 corvette starting issue

Originally Posted by thelal1
Power to starter from battery, no power any where else. Replaced battery because defective still no power. What relay is mounted on drivers side upper fender well. It has two fuseable links. One wire is soft at connection. What is this relay/switch?
I had a SS Chevelle that had same issue and it was this connection. That caused the iissues.
1972

I want to thank all for the input on my power issue.
Ran test on fusible link on main power from starter to horn relay which spreads power out. They tested OK but at the horn relay nothing. Talked to a guy up in. NC who told me that sometimes gm solder lines together on runs. That was it, fixed it ,runs good.
Thanks
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Old Dec 1, 2017 | 08:29 PM
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I had a 4 way junction in the middle of main hot wire that let go on an 87 diesel Oldsmobile something. Guy kept telling me I was selling him defective alternators til I drove 50 miles and found the problem for free. And he was supposed to be the mechanic... but places where a big hot wire branches off can let go on you.
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Old Dec 1, 2017 | 08:39 PM
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Originally Posted by derekderek
I had a 4 way junction in the middle of main hot wire that let go on an 87 diesel Oldsmobile something. Guy kept telling me I was selling him defective alternators til I drove 50 miles and found the problem for free. And he was supposed to be the mechanic... but places where a big hot wire branches off can let go on you.
Power loss, issue was that the previous owner added an electric fan. For some reason he went to middle of firewall under steering column, put in a small circuit box to power that fan and added a fuse for the 10 gauge wire from selonoid to horn relay, like a miniature fuse box. He told me that fuse blew every 3 months, so car would lose complete power. Which meant when fuse blew the car stopped running. I corrected that issue.
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