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Starter solenoids
Posted: Tue Jul 11, 2017 3:33 am
by lukep6470
So the solenoid is going on yet another starter for me. For some reason I've always been hard on them no matter what the car.
I'm starting to get a collection of good Ford compatible starters with dud solenoids as it is only $50 more for a complete starter.
Does anyone else have this issue?
Re: Starter solenoids
Posted: Tue Jul 11, 2017 3:38 am
by hybrid
Built-in solenoid or external?
Maybe it's getting too hot?
Re: Starter solenoids
Posted: Tue Jul 11, 2017 3:40 am
by lukep6470
built in. The headers are ceramic coated but the downpipes aren't.
Re: Starter solenoids
Posted: Tue Jul 11, 2017 3:41 am
by lukep6470
It always lets me down on a cold start and is OK hot.
Re: Starter solenoids
Posted: Tue Jul 11, 2017 5:31 am
by boofhead
grounding problem - maybe
Re: Starter solenoids
Posted: Tue Jul 11, 2017 5:53 am
by Nuts
I agree with Boof. I'd review the engine to body earth and also the gauge of the battery and earth cables.
Re: Starter solenoids
Posted: Tue Jul 11, 2017 7:27 am
by lukep6470
The Battery + is connected directly to the starter with Gauge 2 cable. The battery is grounded to a cylinder head with the same gauge. I do think it is the solenoid. This Mustangs starter motor history is:
The original clapper lunched itself (Windings came loose), it was replaced with a Repco starter that 12-18 months later started to act up. It was then replaced with one of those Procomp red starter motors which is the current one. It has actually had a pretty good innings as it is just over 2 years old.
I just don't think this aftermarket stuff (especially Procomp) is up to the task of a daily driver.
My new headers arrived today (1 5/8 mid length) so when I go to test fit them I will take the starter off and try pulling apart the solenoid.
Re: Starter solenoids
Posted: Tue Jul 11, 2017 7:32 am
by hybrid
I had a cheap chinese shitter in mine too (DSM brand). It was terrible... ended up sounding like it was eating my flywheel.
So now I have a Bronco Bosch starter in mine.
Bosch part number BXA005N.
1.4KW FORD BRONCO 302 WINDSOR V8 85~96
Supercheap had them on ebay for $150, but they have gone up now.
Kerry managed to get a couple from Repco for $150 trade price.
Re: Starter solenoids
Posted: Tue Jul 11, 2017 9:43 pm
by lukep6470
Yeah the cranking sound is pretty harsh. I will look into the bosch unit thanks.
Re: Starter solenoids
Posted: Tue Jul 11, 2017 10:19 pm
by lukep6470
hybrid wrote:I had a cheap chinese shitter in mine too (DSM brand). It was terrible... ended up sounding like it was eating my flywheel.
So now I have a Bronco Bosch starter in mine.
Bosch part number BXA005N.
1.4KW FORD BRONCO 302 WINDSOR V8 85~96
Supercheap had them on ebay for $150, but they have gone up now.
Kerry managed to get a couple from Repco for $150 trade price.
You have the solenoid mounted on the fender correct?
I found the later model Bosch one which I need for $109
SR7517X
I'll have to check but I think this might be the one I bought from Repco a few years back.
Re: Starter solenoids
Posted: Tue Jul 11, 2017 10:30 pm
by hybrid
No, I don't have an external solenoid any more.
I've converted to the on board solenoid, which is what the bosch model I posted has.
Re: Starter solenoids
Posted: Wed Jul 12, 2017 9:21 pm
by lukep6470
So I thought I'd try an experiment this morning and put a multimeter across the cylinder head and the block. There is a very small voltage .03V differential during cranking. Considering I used a 30yo Fluke it may be higher than that.
Maybe that black coating on ARP head bolts is an insulator?
I will buy a strap to put between the heads and block and see if that helps.
Re: Starter solenoids
Posted: Wed Jul 12, 2017 9:39 pm
by boofhead
I often see 12v drop to 9v during cranking. Any thing lower than 9v is a worry. Drawing only 0.03v compared to block and head is nothing so good low resistance between them.
I run a neg battery cable down to the body then across to the engine as one cable.
I also put a strap from the back of a cylinder head to the body.
Just to make sure.