90Rexx

ok so B18C1 in 97 hatch.

thermostat ground has 4 ohms of resistance
valve cover to rad support ground has 4 ohms of resistance
trans to frame ground has 5 ohms of resistance

experiencing a slower than normal crank.

what does everyone think about these resistance values? they sound a little high to me
all the grounds are normal size wires for grounding. not skinny wires lol... and the tranny ground is a braided ground strap. should they be replaced?

also tested battery terminal to ground and found no resistance so the batteyr ground is good.

namewasdallas

take the grounds off and make sure there contacting the groud or not curroded

90Rexx

contact areas are all good/ have been cleaned

Blk00EJ8

what makes them sound high? 4 ohms is not a very significant amount of resistance. if you have doubts about the grounds, try doubling up all your ground wires and try it again. it's not just the resistance but the thickness of the cables to carry charge, which is physically limited by the cross-sectional area, i.e. gauge.

how old is your battery? it's possible your battery isn't providing enough current. have it tested at autozone for free. maybe your starter is old?

90Rexx

battery is brand new... replaced it first for the slow crank issue. and it helped alot, but its still not up to par.

i guess ill just replace all the grounds since its cheap anyways... no sense in babbling on about it on a forum for a week just to save 10 bucks in wire lol...

Relic1

4-5 ohms is a lot more than you think when you're powering the starter. Especially since all that current running through the 4-5 ohms is going to create heat, which means the wire will degrade rapidly, increasing the resistance every time you use the starter.

Ground resistance readings should be <1.5, the less resistance the better.

I'd replace the trans to chassis ground with new 4awg wire and connections.
(5ohms through the second largest ground wire on the car, yikes)

90Rexx

thanks relic i thought those values were high, but its been a while since i got out of school for this **** so i couldnt remember lol....

MikeW

How are you measuring the grounds? You should isolate the part of the circuit your checking resistance on. Is the battery unhooked when you do these test? and four ohms is way to high for your grounds. Re test them with the grounds isolated, hell take them off the car then test them. Another good test would be to voltage drop the battery to starter cable to see if you have an issue.

90Rexx

theres no voltage drop between starter and battery already tested. and im testing resistance between the wire ends... so my 4-5 ohms is in the wire. that 4-5 ohms isnt even including any resistance between the end of the wire connected to the chassis and battery.

MikeW

Which wire are you testing? Again are you unhooking the circuit from the car? What was the voltage drop on the starter wire WHILE starting?