dcolpitts

Tried to start my 79 us 928 and the starter will not engage. Tested voltage and complete ignition has voltage, checked fuel circuit is good, is there a circuit that needs to complete before starter engages. I'm in the process of checking ground connections now with no luck so far.

whatudrivin

Has it started before or is this the first time in a while you have tried to start it? There are many threads regarding no starts on here so you might search a bit for tips.

Mrmerlin

have you inspected the 14 pin connector under the hood at the hot post?

Dennis Wilson

Did you check the voltage at the coil when the key was in the crank position? If you got 6 to 9 volts, the ignition switch is OK and the problem is either low voltage to the starter solenoid or a bad solenoid. If you get no or low voltage to the coil with the key in the crank position, the ignition switch is bad or the 50 circuit connector or wring is bad.

Dennis

Alan

Is it a manual or Auto?

Later auto cars have a neutral safety switch which must conduct for the starter to run. It is usually on the ground side of the coil connection and connects to the transmission though connections in the spare tire well (front upper part). Not sure about on a 79... don't remember seeing this config. will need to look later.. anyone with a 79 who knows about this?

Alan

Mrmerlin

instead of rewriting testing instructions please do this
click search at top of the page
then click advanced search
then in the keyword box fill in "starter testing"
then fill in a name, use one of these Wallyp or Alan
then click on the 928 forum
then hit search.

This will give you much info on testing and troubleshooting,
before others try to rewrite all of the info thats been written already

NOTE Alan and Wallyp are some of the best electron wranglers we have,
so finding info they provide will usually reduce troubleshooting time and result in restored performance, without letting the Lucas out of the wires.

Kevin in Atlanta

Or use this link to do a google search with those same search criteria. It is much better than advanced search above. I saved this as a favorite and use it all the time.

928 Related search on rennlist

z driver 88t

If you have power, 928 non-crank is pretty striaght forward. I've had to trouble shoot this a few times.

Ignition switch, starter relay, starter or battery are the main things that would keep it from turning over.

My technique was this.
1. Load test the battery just to make sure it is strog enough.
2. Pull the starter relay.
3. measure continuity across 30/87 relay terminals. Should be no contiuity.
4. Apply 12V to the to the 85/86 relay terminals. You should hear a click. Check for continuity. You should have continuity. All this OK? Starter relay should be good.
5. Turn the key to ON. Do not reinstall relay yet.
4. Jumper the 30 / 87 relay terminals at the relay panel and see if the car starts
5. If yes - fault is likely with ignition switch. If no, fault is likely with starter.
6. With ignition switch to ON, measure voltage at the panel at 85/86 terminals. Should be 0
7. Have a helper turn the car to START while you measure the voltage. Should go to 12+. If yes - ignition switch should be good, if no ignition switch may be bad.

Even with this technique I have had some screwy problems where everything tests correctly and the car would still not turn over unless I manually jumped the 30/87 terminals, but this should narrow down your potential list of problems.

James Bailey

This is the basket case he bought in Dec for $1.....so it was in parts has never run for him..

dcolpitts

how can I test relay on start, it appears there might be a problem behind the fuse/relay panel. thanks for the help

James Bailey

YOU have no idea what may or may not be wrong. Do you understand what a relay does ? how it works ?

Chris above gave you some great advice...see item #4 that tells you how to bypass a relay for testing the starter circuit.

dcolpitts

this car was bought 1 yr ago dec, I do know what is a relay is I don't have access to internet as fast as most of you, I will not post again to this site again so as not to inconvience anyone anymore thanks for the help for previous post replies

James Bailey

The electrical part of the ignition switch often wears out which is what Chris was trouble shooting in step 6 and 7. Sorry if I seemed abrupt or annoyed but when someone asks for help/advise then asks another question which was covered by previous excellent advice it makes it very hard to repeat the same ignored advice. Also the question about auto or 5 speed means another circuit for the neutral safety switch on the auto which was never answered.

There is a unbelievable wealth of knowledge on this forum about 928s most are quite willing to share.

It is highly unlikely that there are problems behind the circuit board.

You can always jump the wires at the starter motor just like a Chevy or Ford to engage the starter just be sure it is NOT in gear !! since you are under the car.

Alan

Grow a thicker skin... you will get better 928 advice - and get it faster - here on rennlist than anywhere else on the planet - so don't go shooting yourself in the foot.

Give more details, don't assume anything - tell us what what problem you have in as much detail as you can, tell us about your car (year, transmission, what other problems do you have...) and follow up on suggestions with responses. You already got plenty of suggestions to start work on...

Alan

neilh

^^^ and where you are located, maybe someone close by can help