1983 SC No power to starter solenoid

[ray40]

Guys have been going through this for hours now and I still cannot get power to starter solenoid through the ignition switch. Any suggestions appreciated!

Large Yellow wire has been tested from 14 pin connector at rear relay box and is good to solenoid
also jumped wire before connector in the harness and still good - so plug is OK

Thought it might be ignition switch so I (foolishly) removed switch and not just the connector- and tested pin 30 to pin 50 on ignition switch and all is good there too

Putting power to the female pin within the firewall plug for the switch and Nothing but a click on the fuel pump relay so power is getting there as well- although pump is at the moment jumped without the relay

I know the yellow wire shares power with a few other components but I cannot find where those junctions might be unless they are buried in the harness somewhere.
according to Bentley the yellow wire should leave the switch and go directly to the rear plug at the rear relay box. what am I missing?

[PeteKz]

On my earlier car there is another 14 pin connector at the front of the relay panel. Probably on SCs too. Check there.

[ray40]

Originally Posted by PeteKz

On my earlier car there is another 14 pin connector at the front of the relay panel. Probably on SCs too. Check there.

nope- the harness just passes underneath the relay panel - but tnx

[boyt911sc]

Originally Posted by ray40

nope- the harness just passes underneath the relay panel - but tnx

Ray,

The engine wire harness for SC’s has the 14-pin connector. This is a standard electrical part for all SC’s to enable to disconnect the motor from the chassis aside for the other mechanical connections. There should be 14-pin connector in your chassis and motor.

Could you post a picture of the engine relay panel located in the engine bay (driver side)? Thanks.

Tony

[ray40]

Originally Posted by boyt911sc

Ray,

The engine wire harness for SC’s has the 14-pin connector. This is a standard electrical part for all SC’s to enable to disconnect the motor from the chassis aside for the other mechanical connections. There should be 14-pin connector in your chassis and motor.

Could you post a picture of the engine relay panel located in the engine bay (driver side)? Thanks.

Tony

My mistake in my original post I mentioned that I had tested at the 14 pin plug on the rear relay and stated that it was on the front - when looking at it it is in front of you-
But it’s on the rear of the relay box. And yes it’s been tested thoroughly including the plug and socket - all is good

[ray40]

I have also exposed the harness just before it goes underneath the fuel filter and was able to use my power probe to put power to yellow wire - starter turns just fine from there

[targa80]

I have looked at the 81 schematic and the connections from ignition switch terminal (50) yellow wire connects to connector T1-E (on luggage compartment floor) to connector T14-1 (on regulator panel in engine bay) to terminal 50 yellow wire on starter motor solenoid. You have several options:
1. Disconnect battery and perform an ohm continuity test from disconnected ignition switch terminal 50 to disconnected starter solenoid terminal 50. This test would require a long jumper wire with alligator leads. The result should be a very low resistance reading. If the resistance reads infinity move one lead to the closest connector and retest until you find the open contact. Also, test wire to chassis ground for a possible short to ground.
2. Disconnect terminal 50 from starter solenoid and check for voltage on wire with ignition switch in start position. No voltage move to next connector in circuit and check again.

Good luck with your troubleshooting.

[ray40]

Originally Posted by targa80

I have looked at the 81 schematic and the connections from ignition switch terminal (50) yellow wire connects to connector T1-E (on luggage compartment floor) to connector T14-1 (on regulator panel in engine bay) to terminal 50 yellow wire on starter motor solenoid. You have several options:
1. Disconnect battery and perform an ohm continuity test from disconnected ignition switch terminal 50 to disconnected starter solenoid terminal 50. This test would require a long jumper wire with alligator leads. The result should be a very low resistance reading. If the resistance reads infinity move one lead to the closest connector and retest until you find the open contact. Also, test wire to chassis ground for a possible short to ground.
2. Disconnect terminal 50 from starter solenoid and check for voltage on wire with ignition switch in start position. No voltage move to next connector in circuit and check again.

Good luck with your troubleshooting.

tnx for that - yes I have continuity from switch to solenoid term 50 - problem is somewhere in-between the switch and the starter. I am in the process of locating and disconnecting the a/c relay and the vent switch -- if I can find it - thinking they are shorting the circuit when battery is back on.

[targa80]

Pulling the ac relay, heater relay and the fuel pump relay will eliminate any possible problems from the starter terminal 50 circuit. At that point apply power and check for 12 volts at the disconnected starter terminal 50 wire with ignition switch to start position. If no 12 volts work your way back to through each connector to the ignition switch terminal 50.

[ray40]

Originally Posted by targa80

Pulling the ac relay, heater relay and the fuel pump relay will eliminate any possible problems from the starter terminal 50 circuit. At that point apply power and check for 12 volts at the disconnected starter terminal 50 wire with ignition switch to start position. If no 12 volts work your way back to through each connector to the ignition switch terminal 50.

tnx Pat looks like I found the problem at the 14 pin connector - cleaned and widened the pins for better contact and sure enough she turns over! cannot believe how many hours it took to get here ... and now I get to put the ignition switch back in the dash - fun